SciELO - Scientific Electronic Library Online

 
vol.36 número1Minimización de los efectos atmosféricos en el índice espectral de la vegetación IVISRespuesta de variedades de maíz (Zea mays L.) a diferentes fuentes de fertilización en el Valle de Puebla índice de autoresíndice de assuntospesquisa de artigos
Home Pagelista alfabética de periódicos  

Serviços Personalizados

Journal

Artigo

Indicadores

Links relacionados

  • Não possue artigos similaresSimilares em SciELO

Compartilhar


Terra Latinoamericana

versão On-line ISSN 2395-8030versão impressa ISSN 0187-5779

Resumo

CRUZ FALCON, Arturo et al. Groundwater types and total dissolved solids distribution in the aquifer of La Paz Baja California Sur, México. Terra Latinoam [online]. 2018, vol.36, n.1, pp.39-48. ISSN 2395-8030.  https://doi.org/10.28940/terra.v36i1.316.

The aquifer of La Paz has been overexploited for several years, causing contamination by seawater intrusion. A well-monitoring network, which included public-urban, agricultural, livestock and service use water wells, was set up in 2013. Representative sampling during the dry and rainy seasons was carried out. Concentration of total dissolved solids (TDS), temperature, dissolved oxygen and pH were measured. Results indicate that most agricultural wells contain high TDS concentration, compared to potable water wells with concentration below 1000 mg L-1, which is the limit allowed by the Mexican official standard (MOS). Majority ion data from 14 wells near the coast with high concentration of TDS were also analyzed, with which a Piper diagram was constructed. Two main types of water were found: calcium-chloride and sodium-chloride. The presence of sodium in concentrations exceeding 200 mg L-1 in 8 wells, and magnesium with more than 50 mg L-1 in 10 wells, both above the MOS, reveal that its origin is seawater. Calcium concentrations above 250 mg L-1 in 7 wells points to the existence of sedimentary layers of chemical-organic origin that compose the inner stratigraphy of the aquifer through which groundwater circulates. High chloride concentrations of more than 1000 mg L-1 in 6 wells with high concentration of TDS, suggests that its source is seawater intrusion. Based on the distribution of TDS concentration, two broad areas affected by seawater intrusion were delimited, and along with the distribution of water families, three main aquifer zones were identified.

Palavras-chave : seawater intrusion; groundwater quality; salts contamination; contamination of groundwater in coastal areas.

        · resumo em Espanhol     · texto em Espanhol     · Espanhol ( pdf )