Evaluation of heavy metals accumulation in selected food fish Mystus cavasius from river Krishna, Andhra Pradesh

Abstract

Heavy metal accumulation has become a serious threat to the present century, particularly in fish and fishery products. These metals are dangerous are impact on aquatic fauna and it can be bio accumulated in the organisms through food chain. It leads to very chronic and complicated problems in the human beings. Cumulative properties of metals and prolonged poisoning may result very complicated problems even low concentrations. The river Krishna is one of the largest domestic water covers area of about 2,58,948 sq km and spread is across the four southern states Maharashtra, Karnataka, Telangana and Andhra Pradesh. The heavy metals that get enter into water channel because the fly ash tanks of the VTPS are not properly lined and they end up contaminating the surface water is released into sumps which intern discharges into the drainage canal. The discharge canal has a length of about 1.9 km and discharges polluted water into river Krishna at 0.4 km downstream from the shores of Ibrahimpatnam. The average concentrations of Ni, Cd, and Pb were below the permissible limits and Zn and Cu are slightly higher of established by WHO. Potential human health risks were evaluated in river Krishna by measuring the estimated daily intake (EDI) and target hazard quotient (THQ). Therefore, this baseline data would help to adopt strategies in control measures and protect the fragile river environment.