Spatial and seasonal mercury distribution in the Ayapel Marsh, Mojana region, Colombia.
Int J Environ Health Res
; 20(6): 451-9, 2010 Dec.
Article
em En
| MEDLINE
| ID: mdl-21161806
ABSTRACT
Geographical and temporal changes of total mercury (T-Hg) concentrations in sediments, macrophytes and fish were evaluated in the Ayapel Marsh, Mojana, Colombia. Sampling was conducted during 2006-2007, including both rainy and dry seasons, and T-Hg was measured using atomic absorption spectroscopy. Distribution of T-Hg in sediments and the macrophyte Eichhornia crassipes showed that higher concentrations were found along the flooding pathway of the Cauca River. Hg has also polluted the food chain. Highest T-Hg concentrations in fish were detected for the carnivorous Pseudoplatystoma fasciatun (0.432 ± 0.107 µg/g, fresh weight [fw]), and lowest in the non-carnivorous Prochilodus magdalenae (0.143 ± 0.053 µg/g, fw), with differences between trophic levels. T-Hg for fish samples (0.298 ± 0.148 µg/g, fw) did not exceed the limit consumption level (0.50 µg/g, fw). It is concluded that mercury-polluted sediments from the Cauca River, contribute to Hg deposition into the Ayapel Marsh. Accordingly, interventions must be conducted to decrease Hg accumulation in fish.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Plantas
/
Sedimentos Geológicos
/
Peixes
/
Mercúrio
Limite:
Animals
País como assunto:
America do sul
/
Colombia
Idioma:
En
Ano de publicação:
2010
Tipo de documento:
Article