Year: 2018, Issue: June

Residual mercury in solid waste, contaminated fishes collected from Rushikulya estuary and impact of solid waste extract on a fresh water fish under laboratory conditions.
Author:
Tapas Kumar Priyadarsan and A. K. Panigrahi
Keyword:
Chlor-alkali industry, Solid waste, SWE, Mercury, Ventilation rate, Whole body oxygen uptake.
The collected solid waste from the dumped site was air dried and powdered. The powder was grayish white with 37% water holding capacity, with a specific gravity of 2.6% and 24% air content. The solid waste contained 106�16.5 mg of Hg Kg-1 dry weight. Significant decreases in all parameters were observed in the solid waste, might be due regular washing of the solid waste deposits by monsoon rain. The SWE prepared from this powder showed the features shown on Table.1. The solid waste extract contained 9.75 mg of Hg l-1. The exposed fishes appeared lethargic and loss of equilibrium and irregular swimming was observed when compared to control fish. The ventilation rate and whole body oxygen uptake significantly depleted in SWE exposed fishes in the exposure period when compared to control fish. It was observed that when fishes were exposed to toxicant, SWE for a lower period, chances of recovery was noted. Prolonged exposure to SWE lead to death and no recovery was noted even when best environmental conditions were made available.

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