<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0188-4999</journal-id>
<journal-title><![CDATA[Revista internacional de contaminación ambiental]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Int. Contam. Ambient]]></abbrev-journal-title>
<issn>0188-4999</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Ciencias de la Atmósfera y Cambio Climático]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-49992024000100151</article-id>
<article-id pub-id-type="doi">10.20937/rica.55094</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Prediction, modeling, and optimization studies of eco-friendly gold extraction using alpha-cyclodextrin and the RSM and CCD methods]]></article-title>
<article-title xml:lang="es"><![CDATA[Estudios de predicción, modelado y optimización de extracción ecológica de oro utilizando alfa-ciclodextrina y los métodos RSM y CCD]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Muanda]]></surname>
<given-names><![CDATA[Meschack Mukunga]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Omalanga]]></surname>
<given-names><![CDATA[Pele Pascal Daniel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mitonga]]></surname>
<given-names><![CDATA[Vanessa Mwambaie]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ilunga]]></surname>
<given-names><![CDATA[Michée Ngoy]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Alexandria University Faculty of Engineering Chemical Engineering Department]]></institution>
<addr-line><![CDATA[Alexandria ]]></addr-line>
<country>Egypt</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Lubumbashi Polytechnic Faculty Department of Industrial Chemistry]]></institution>
<addr-line><![CDATA[Lubumbashi ]]></addr-line>
<country>Democratic Republic of the Congo</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,University of Lubumbashi Civil Engineering Department School of Industrial Engineers]]></institution>
<addr-line><![CDATA[Lubumbashi ]]></addr-line>
<country>Democratic Republic of the Congo</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,University of Lubumbashi Electrical Engineering (Computer Engineering) Department School of Industrial Engineers]]></institution>
<addr-line><![CDATA[Lubumbashi ]]></addr-line>
<country>Democratic Republic of the Congo</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2024</year>
</pub-date>
<volume>40</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992024000100151&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992024000100151&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992024000100151&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT In the Democratic Republic of the Congo, gold extraction from ore in South Kivu utilized alpha-cyclodextrin (&#945;-CD) as an eco-friendly method to replace harmful methods. Analysis of variance and response surface methodology were employed for prediction, modeling, and optimization studies. Atomic absorption spectroscopy revealed a 0.06% gold content in a randomly taken ore sample. Leaching with modified aqua regia was optimized with the following parameters: 7.27 h, 50 g/L HBr concentration, pH 1, and 200 rpm stirring speed, resulting in 98.5% removal. Neutralization tests with potassium hydroxide (KOH) followed leaching to prepare the solution medium with appropriate pH for extraction test, by varying parameters such as time, KOH concentration, and pH. Following neutralization, extraction tests with &#945;-CD were carried out and optimized with the following parameters: 40 min, &#945;-CD concentration of 11.6166 g/L, and a pH of 5, resulting in a percent removal of 98.9%. &#945;-CD&#8217;s eco-friendly nature, cost-effectiveness, and high percent removal make it a promising and sustainable alternative for gold recovery, appealing to the mining industry.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN En Kivu del Sur, República Democrática del Congo, se utilizó alfa-ciclodextrina (&#945;-CD) para la extracción de oro a partir de minerales, como método ecológico para reemplazar los métodos nocivos. Se emplearon el análisis de varianza y la metodología de superficie de respuesta para los estudios de predicción, modelado y optimización. La espectroscopia de absorción atómica reveló un contenido de oro de 0.06 % en el mineral. La lixiviación con agua regia modificada se optimizó con los siguientes parámetros: 7.27 h, 50 g/L de concentración de HBr, pH 1 y velocidad de agitación de 200 rpm, lo que resultó en una eliminación del 98.5 %. Pruebas de neutralización con hidróxido de potasio (KOH) siguieron a la lixiviación, para preparar el medio con el pH adecuado para la prueba de extracción, variando parámetros como el tiempo, la concentración de KOH y el pH. Después de la neutralización se realizaron pruebas de extracción con &#945;-CD y se optimizaron con los siguientes parámetros: 40 min, concentración de &#945;-CD de 11.6166 g/L y pH de 5, resultando en un porcentaje de remoción de 98.9 %. La naturaleza ecológica, la rentabilidad y el alto porcentaje de eliminación de &#945;-CD lo convierten en una alternativa prometedora y sostenible para la recuperación de oro, atractiva para la industria minera.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[ANOVA]]></kwd>
<kwd lng="en"><![CDATA[valuable metal]]></kwd>
<kwd lng="en"><![CDATA[modified aqua regia]]></kwd>
<kwd lng="en"><![CDATA[optimization]]></kwd>
<kwd lng="en"><![CDATA[environmental solution]]></kwd>
<kwd lng="es"><![CDATA[ANDEVA]]></kwd>
<kwd lng="es"><![CDATA[metal valioso]]></kwd>
<kwd lng="es"><![CDATA[agua regia modificada]]></kwd>
<kwd lng="es"><![CDATA[optimización]]></kwd>
<kwd lng="es"><![CDATA[solución ambiental]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Acar]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Process development metallurgical studies for gold cyanidation process]]></article-title>
<source><![CDATA[Minerals and Metallurgical Processing]]></source>
<year>2016</year>
<volume>33</volume>
<page-range>161-71</page-range></nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Almagro]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<name>
<surname><![CDATA[Pedreño]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Use of cyclodextrins to improve the production of plant bioactive compounds]]></article-title>
<source><![CDATA[Phytochemistry Reviews]]></source>
<year>2020</year>
<volume>19</volume>
<page-range>1061-80</page-range></nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Anthony]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Abubakar]]></surname>
<given-names><![CDATA[Z.U.]]></given-names>
</name>
<name>
<surname><![CDATA[Atta]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Magaji]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Recovery of gold from Shanono gold ore deposit using &#945;-cyclodextrin]]></article-title>
<source><![CDATA[Mining, Metallurgy and Exploration]]></source>
<year>2020</year>
<volume>37</volume>
<page-range>1265-71</page-range></nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="confpro">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bakatula-Nsimba]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Tutu]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Cukrowska]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Weiersbye]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
</person-group>
<source><![CDATA[Characterisation of cyanide in gold-mine tailings of the Witwatersrand. Conference paper]]></source>
<year>2013</year>
<conf-name><![CDATA[ 10th International Mine Water Association Congress]]></conf-name>
<conf-loc>Karlovy Vary, Czech Republic </conf-loc>
</nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bezerra]]></surname>
<given-names><![CDATA[F.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Lis]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Firmino]]></surname>
<given-names><![CDATA[H.B.]]></given-names>
</name>
<name>
<surname><![CDATA[Dias da Silva]]></surname>
<given-names><![CDATA[J.G.]]></given-names>
</name>
<name>
<surname><![CDATA[Curto Valle]]></surname>
<given-names><![CDATA[R.C.S.]]></given-names>
</name>
<name>
<surname><![CDATA[Borges Valle]]></surname>
<given-names><![CDATA[J.A.]]></given-names>
</name>
<name>
<surname><![CDATA[Scacchetti]]></surname>
<given-names><![CDATA[F.A.P.]]></given-names>
</name>
<name>
<surname><![CDATA[Tessaro]]></surname>
<given-names><![CDATA[A.L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The role of &#946;-cyclodextrin in the textile industry - Review]]></article-title>
<source><![CDATA[Molecules]]></source>
<year>2020</year>
<volume>25</volume>
<numero>16</numero>
<issue>16</issue>
<page-range>3624-52</page-range></nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bhardwaj]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
<name>
<surname><![CDATA[Singh]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Kumar]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Kumar]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Budhwar]]></surname>
<given-names><![CDATA[V.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Eco-friendly greener synthesis of nanoparticles]]></article-title>
<source><![CDATA[Advanced Pharmaceutical Bulletin]]></source>
<year>2020</year>
<volume>10</volume>
<numero>4</numero>
<issue>4</issue>
<page-range>566-76</page-range></nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bonggotgetsakul]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Cattrall]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Kolev]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Recovery of gold from aqua regia digested electronic scrap using a poly(vinylidene fluoride-co-hexafluoropropene) (PVDF-HFP) based polymer inclusion membrane (PIM) containing Cyphos® IL 104]]></article-title>
<source><![CDATA[Journal of Membrane Science]]></source>
<year>2016</year>
<volume>514</volume>
<page-range>274-81</page-range></nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Chang]]></surname>
<given-names><![CDATA[Y.C.]]></given-names>
</name>
<name>
<surname><![CDATA[Chen]]></surname>
<given-names><![CDATA[D.H.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Recovery of gold (III) ions by a chitosan-coated magnetic nano-adsorbent]]></article-title>
<source><![CDATA[Gold Bulletin]]></source>
<year>2006</year>
<volume>39</volume>
<page-range>98-102</page-range></nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Cyganowski]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Garbera]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Le&#347;niewicz]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Wolska]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Pohl]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Jermakowicz-Bartkowiak]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The recovery of gold from the aqua regia leachate of electronic parts using a core-shell type anion exchange resin]]></article-title>
<source><![CDATA[Journal of Saudi Chemical Society]]></source>
<year>2017</year>
<volume>21</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>741-50</page-range></nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Deschênes]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Advances in the cyanidation of gold]]></article-title>
<source><![CDATA[Developments in Mineral Processing]]></source>
<year>2005</year>
<volume>15</volume>
<page-range>479-500</page-range></nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Grayson]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Fine gold recovery-alternatives to mercury and cyanide purpose of study]]></article-title>
<source><![CDATA[World Placer Journal]]></source>
<year>2007</year>
<volume>7</volume>
<page-range>66-161</page-range></nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Jansook]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Ogawa]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Loftsson]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Cyclodextrins: Structure, physicochemical properties and pharmaceutical applications]]></article-title>
<source><![CDATA[International Journal of Pharmaceutics]]></source>
<year>2017</year>
<volume>535</volume>
<numero>1-2</numero>
<issue>1-2</issue>
<page-range>272-84</page-range></nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Karume]]></surname>
<given-names><![CDATA[I.]]></given-names>
</name>
<name>
<surname><![CDATA[Tewolde]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Tebandeke]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Mukasa]]></surname>
<given-names><![CDATA[I.Z.T.]]></given-names>
</name>
<name>
<surname><![CDATA[Mbabazi]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Efficiency of crude &#945;-cyclodextrin in gold recovery from electronic waste and soil]]></article-title>
<source><![CDATA[Green and Sustainable Chemistry]]></source>
<year>2022</year>
<volume>12</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>73-82</page-range></nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Knosp]]></surname>
<given-names><![CDATA[H.]]></given-names>
</name>
<name>
<surname><![CDATA[Holliday]]></surname>
<given-names><![CDATA[R.]]></given-names>
</name>
<name>
<surname><![CDATA[Corti]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Gold in dentistry: Alloys, uses and performance]]></article-title>
<source><![CDATA[Gold Bulletin]]></source>
<year>2003</year>
<volume>36</volume>
<page-range>93-102</page-range></nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
<name>
<surname><![CDATA[Zhu]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Sun]]></surname>
<given-names><![CDATA[P.]]></given-names>
</name>
<name>
<surname><![CDATA[Zhang]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
<name>
<surname><![CDATA[Li]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Xu]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Gong]]></surname>
<given-names><![CDATA[X.]]></given-names>
</name>
<name>
<surname><![CDATA[Zou]]></surname>
<given-names><![CDATA[X.]]></given-names>
</name>
<name>
<surname><![CDATA[Geim]]></surname>
<given-names><![CDATA[A. K.]]></given-names>
</name>
<name>
<surname><![CDATA[Su]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
<name>
<surname><![CDATA[Cheng]]></surname>
<given-names><![CDATA[H. M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Highly efficient and selective extraction of gold by reduced graphene oxide]]></article-title>
<source><![CDATA[Nature Communications]]></source>
<year>2022</year>
<volume>13</volume>
<page-range>4472-82</page-range></nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Liu]]></surname>
<given-names><![CDATA[G.C.]]></given-names>
</name>
<name>
<surname><![CDATA[Wang]]></surname>
<given-names><![CDATA[X.L.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Optimization of critical medium components using response surface methodology for biomass and extracellular polysaccharide production by Agaricus blazei]]></article-title>
<source><![CDATA[Applied Microbiology and Biotechnology]]></source>
<year>2007</year>
<volume>74</volume>
<page-range>78-83</page-range></nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Liu]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Schneebeli]]></surname>
<given-names><![CDATA[S.T.]]></given-names>
</name>
<name>
<surname><![CDATA[Stoddart]]></surname>
<given-names><![CDATA[J.F.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Second-sphere coordination revisited]]></article-title>
<source><![CDATA[Chimia]]></source>
<year>2014</year>
<volume>68</volume>
<numero>5</numero>
<issue>5</issue>
<page-range>315-20</page-range></nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mertol]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
<name>
<surname><![CDATA[Birich]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Stopi&#263;]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Friedrich]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[A review on alternative gold recovery reagents to cyanide]]></article-title>
<source><![CDATA[Journal of Materials Science and Chemical Engineering]]></source>
<year>2016</year>
<volume>4</volume>
<numero>8</numero>
<issue>8</issue>
<page-range>8-17</page-range></nlm-citation>
</ref>
<ref id="B19">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Muanda]]></surname>
<given-names><![CDATA[M.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Omalanga]]></surname>
<given-names><![CDATA[P.P.D.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Influence of lead nitrate on sulfurizing flotation of a copper-cobalt oxide ore]]></article-title>
<source><![CDATA[Walailak Journal of Science and Technology]]></source>
<year>2021</year>
<volume>18</volume>
<numero>10</numero>
<issue>10</issue>
<page-range>1-13</page-range></nlm-citation>
</ref>
<ref id="B20">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Muanda]]></surname>
<given-names><![CDATA[M.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Omalanga]]></surname>
<given-names><![CDATA[P.P.D.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Modeling and optimization of manganese carbonate precipitation using response surface methodology and central composite rotatable design]]></article-title>
<source><![CDATA[The Journal of Engineering and Exact Sciences]]></source>
<year>2021</year>
<volume>7</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>1-22</page-range></nlm-citation>
</ref>
<ref id="B21">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Muanda]]></surname>
<given-names><![CDATA[M.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Omalanga]]></surname>
<given-names><![CDATA[P.P.D.]]></given-names>
</name>
<name>
<surname><![CDATA[Mitonga]]></surname>
<given-names><![CDATA[V.M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[comparative cleaning stages in recovery of copper and cobalt from tailings using potassium amylxanthate as collector]]></article-title>
<source><![CDATA[European Journal of Engineering and Technology Research]]></source>
<year>2021</year>
<volume>6</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>96-100</page-range></nlm-citation>
</ref>
<ref id="B22">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Mukunga]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Recovery of copper and cobalt in the comparative flotation of a sulfide ore using xanthate and dithiophosphate as collectors]]></article-title>
<source><![CDATA[International Journal of Engineering and Applied Sciences]]></source>
<year>2019</year>
<volume>6</volume>
<numero>7</numero>
<issue>7</issue>
<page-range>26-9</page-range></nlm-citation>
</ref>
<ref id="B23">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Murthy]]></surname>
<given-names><![CDATA[M.S.R.C.]]></given-names>
</name>
<name>
<surname><![CDATA[Swaminathan]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
<name>
<surname><![CDATA[Rakshit]]></surname>
<given-names><![CDATA[S.K.]]></given-names>
</name>
<name>
<surname><![CDATA[Kosugi]]></surname>
<given-names><![CDATA[Y.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Statistical optimization of lipase catalyzed hydrolysis of methyloleate by response surface methodology]]></article-title>
<source><![CDATA[Bioprocess Engineering]]></source>
<year>2000</year>
<volume>22</volume>
<page-range>35-9</page-range></nlm-citation>
</ref>
<ref id="B24">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Neag]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Kovacs]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Dinca]]></surname>
<given-names><![CDATA[Z.]]></given-names>
</name>
<name>
<surname><![CDATA[Török]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Varaticeanu]]></surname>
<given-names><![CDATA[C.]]></given-names>
</name>
<name>
<surname><![CDATA[Levei]]></surname>
<given-names><![CDATA[E.A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Hydrometallurgical recovery of gold from mining wastes]]></source>
<year>2020</year>
</nlm-citation>
</ref>
<ref id="B25">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Oleszek-Listopad]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Sarna-Bo&#347;]]></surname>
<given-names><![CDATA[K.]]></given-names>
</name>
<name>
<surname><![CDATA[Szabelska]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<name>
<surname><![CDATA[Czelej-Piszcz]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<name>
<surname><![CDATA[Borowicz]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
<name>
<surname><![CDATA[Jolanta]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The use of gold and gold alloys in prosthetic dentistry - A literature review]]></article-title>
<source><![CDATA[Current Issues in Pharmacy and Medical Sciences]]></source>
<year>2015</year>
<volume>28</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>192-5</page-range></nlm-citation>
</ref>
<ref id="B26">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Park]]></surname>
<given-names><![CDATA[Y.J.]]></given-names>
</name>
<name>
<surname><![CDATA[Fray]]></surname>
<given-names><![CDATA[D.J.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Recovery of high-purity precious metals from printed circuit boards]]></article-title>
<source><![CDATA[Journal of Hazardous Materials]]></source>
<year>2009</year>
<volume>164</volume>
<numero>2-3</numero>
<issue>2-3</issue>
<page-range>1152-8</page-range></nlm-citation>
</ref>
<ref id="B27">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Petrovi&#263;]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
<name>
<surname><![CDATA[Budjelan]]></surname>
<given-names><![CDATA[D.]]></given-names>
</name>
<name>
<surname><![CDATA[Coki&#263;]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
<name>
<surname><![CDATA[Ne&#353;i&#263;]]></surname>
<given-names><![CDATA[B.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[The determination of the content of gold and silver in geological sample]]></article-title>
<source><![CDATA[Journal of the Serbian Chemical Society]]></source>
<year>2001</year>
<volume>66</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>45-52</page-range></nlm-citation>
</ref>
<ref id="B28">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Saradesh]]></surname>
<given-names><![CDATA[K.M.]]></given-names>
</name>
<name>
<surname><![CDATA[Vinodkumar]]></surname>
<given-names><![CDATA[G.S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Metallurgical processes for hardening of 22 karat gold for light &#8216;weight&#8217; and high strength jewelry manufacturing]]></article-title>
<source><![CDATA[Journal of Materials Research and Technology]]></source>
<year>2020</year>
<volume>9</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>2009-20</page-range></nlm-citation>
</ref>
<ref id="B29">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Singh]]></surname>
<given-names><![CDATA[N.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[A rugged, precise and accurate new gravimetry method for the determination of gold: An alternative to fire assay method]]></article-title>
<source><![CDATA[SpringerPlus]]></source>
<year>2012</year>
<volume>1</volume>
<numero>14</numero>
<issue>14</issue>
<page-range>1-6</page-range></nlm-citation>
</ref>
<ref id="B30">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Smith]]></surname>
<given-names><![CDATA[N.M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[&#8220;Our gold is dirty, but we want to improve&#8221;: Challenges to addressing mercury use in artisanal and small-scale gold mining in Peru]]></article-title>
<source><![CDATA[Journal of Cleaner Production]]></source>
<year>2019</year>
<volume>222</volume>
<page-range>646-54</page-range></nlm-citation>
</ref>
<ref id="B31">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Wei]]></surname>
<given-names><![CDATA[X.]]></given-names>
</name>
<name>
<surname><![CDATA[Viadero Jr.]]></surname>
<given-names><![CDATA[R.C.]]></given-names>
</name>
<name>
<surname><![CDATA[Buzby]]></surname>
<given-names><![CDATA[K.M.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Recovery of iron and aluminum from acid mine drainage by selective precipitation]]></article-title>
<source><![CDATA[Environmental Engineering Science]]></source>
<year>2005</year>
<volume>22</volume>
<numero>6</numero>
<issue>6</issue>
<page-range>745-55</page-range></nlm-citation>
</ref>
<ref id="B32">
<nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Xing]]></surname>
<given-names><![CDATA[W.]]></given-names>
</name>
<name>
<surname><![CDATA[Lee]]></surname>
<given-names><![CDATA[M.S.]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Development of a hydrometallurgical process for the recovery of gold and silver powders from anode slime containing copper, nickel, tin, and zinc]]></article-title>
<source><![CDATA[Gold Bulletin]]></source>
<year>2019</year>
<volume>52</volume>
<page-range>69-77</page-range></nlm-citation>
</ref>
</ref-list>
</back>
</article>
