Assessment of mercury contamination of the Svitava and Svratka rivers and muscle of chub (Leuciscus cephalus L.) in the urban agglomeration of Brno in the Czech Republic
2011
Kruzikova, K.,Veterinarni a Farmaceuticka Univ., Brno (Czech Republic). Ustav Verejneho Veterinarniho Lekarstvi a Toxikologie | Kensova, R.,Veterinarni a Farmaceuticka Univ., Brno (Czech Republic). Ustav Verejneho Veterinarniho Lekarstvi a Toxikologie | Blahova, J.,Veterinarni a Farmaceuticka Univ., Brno (Czech Republic). Ustav Verejneho Veterinarniho Lekarstvi a Toxikologie | Svobodova, Z.,Veterinarni a Farmaceuticka Univ., Brno (Czech Republic). Ustav Verejneho Veterinarniho Lekarstvi a Toxikologie
This study focused on the total mercury and methylmercury content in the muscle of Leuciscus cephalus, the total Hg content in the river sediments and the evaluation of health risks associated with fish contamination. Chub were caught at seven localities on the Svratka and Svitava rivers in the agglomeration of Brno (Czech Republic) in 2008. The results were compared to those obtained from the same sites in 2007. Total Hg was determined by atomic absorption spectrophotometry using an AMA 245 analyzer, and methylmercury was determined by gas chromatography (using an electron-capture detector) after acid digestion and toluene extraction in chub muscle. The highest concentrations of total Hg and methylmercury (0.12+/-0.14 and 0.07+/-0.02 mg/kg fresh weight, respectively) were found in Svratka before junction (south of Brno), whereas the lowest Hg concentration and methylmercury in chub (0.06+/-0.01 and 0.04+/-0.01 mg/kg) was detected in Svitava before junction with the Svratka River. Total Hg in sediments ranged from 0.01 to 1.05 mg/kg dry weight, the highest value was detected in the sediment from Rajhradice. The lowest content (0.01 mg/kg) was at Kninicky. Hazard indices calculated for the selected localities showed no health risk for either a standard consumer or a fishing family.
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