CADMIUM, LEAD AND MANGANESE ACCUMULATED IN FISH COLLECTED FROM NAN RIVER IN THAILAND AND HEALTH RISK ASSESSMENTPRISNA PIANJING, TAMMASAK SAYKAEW, SUREEWAN SILADLAO, WANWIMON MEKWIMON KINGKAEW AND JARINEE SANTIJANYABHORN
Heavy metals, including cadmium (Cd), lead (Pb) and manganese (Mn) were analyzed in 20species of fishs organ such as muscles, gill and viscera of fish sample collected from Nan river at TaphanHin district of Thailand during dry (January) and wet (June) season in 2016. The results showed that in both periods of sampling, the average concentrations of Mn in all fishs organ higher than Cd and Pb. The concentrations of Cd and Mn predominantly accumulated in fishs viscera much more than gill and muscles whereas there was no specific pattern of Pb accumulated in fishs organs. The obtained concentrations of Cd and Pb in muscles of all fish samples in this study exhibited rather low level and the levels did not exceed the safe limits proposed by European Communities (EU)(0.05 mg/kg wet weight) whereas the concentrations of Cd and Pb found in viscera and gill of several fish species exceeded the safe limit of EU. When using the concentration of metal contained in fishs muscles for health risk assessment, the results showed that the obtained calculated estimate daily intake and target hazard quotient values were withinsafe level suggesting the low health risk from consumption of fish muscle collected from Nan River. However, due to the high concentration on fishs viscera exceeding the upper limit guideline of EU, people should avoid consuming the fishs viscera.
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