Human exposure to trace elements in central Cambodia: Influence of seasonal hydrology and food-chain bioaccumulation behaviour.
Ecotoxicol Environ Saf
; 162: 112-120, 2018 Oct 30.
Article
em En
| MEDLINE
| ID: mdl-29990722
ABSTRACT
Exposure to mercury and other trace elements remains an important public health concern, worldwide. The present study involved a comprehensive field study to determine concentrations of fourteen trace elements (Al, As, Cr, Co, Cd, Cu, Fe, Hg, Mn, Ni, Pb, Se, V and Zn) in surface water and different fish species from Tonlé Sap Lake in central Cambodia, during both the dry and wet seasons. Total arsenic (tAs) and Mn in surface water during the dry season exceeded WHO drinking water guidelines. Total mercury (tHg) concentrations (µg/g wet wt.) in fish during the wet season (GMâ¯=â¯0.055; CI95 =â¯0.01-0.26) were approximately 15 times higher (Pâ¯<â¯0.05) compared to those during the dry season (GMâ¯=â¯0.0035; CI95 =â¯0.0004-0.033). Mean target hazard quotients (THQs) for inorganic arsenic (iAs), methyl mercury (MeHg), Mn and Pb were >â¯1, with estimated maximum values greatly exceeding 1. Mean THQs of Zn, Cd, Ni and Se were very near 1, with estimated maximum values exceeding 1. The MeHg THQ (min-max range 0.16-9.09) during the wet season was 7 times higher than in the dry season (min-max range 0.05-1.35). Concentrations of Hg and other trace elements varied widely between fish species. The findings suggest that exposure of some trace elements via water and food is of concern in this region. High consumption rates of fish and rice key factors related to trace element exposure. Seasonal hydrology and species-specific bioaccumulation behaviour in the Tonlé Sap Lake watershed also play an important role. The generated information will be useful to better mitigate trace element exposure in this region.
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Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Estações do Ano
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Poluentes Químicos da Água
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Hidrologia
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Metais Pesados
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Cadeia Alimentar
Limite:
Animals
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Humans
País como assunto:
Asia
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article