The Effect of Zinc Speciation and Its Concentration on Bioaccumulation in Pomfret (Colossoma macropomum) and Sepat Fish (Trichogaster Trichopterus)

Heavy metal Zinc is still a pollutant from various industrial and domestic activities whose waste is directly dumped into the waters. The presence of biota in the waters can be used as a bioindicator to identify the presence of heavy metal contaminants. The kinetics of the Zinc bioaccumulation process through the freshwater route using pomfret (Colossoma macropomum) and sepat fish (Trichogaster trichopterus) as bioindicators have been investigated by analyzing the effect on variations in concentration and pH. This research was conducted by determining Zinc speciation's effect and concentration on the bioaccumulation process. The results showed an increase in concentration would also increase the rate of uptake and elimination rate of Zinc by pomfret and sepat, obtained concentration factors (CF) at variations of Zinc concentration in pomfret was 2.56-22.97 mL.g^–1 and 2.14-56.87 mL.g^–1 in sepat fish. While the value of the concentration factor (CF) in the variation of pH for pomfret is 0.65-13.15 mL.g^–1 and for sepat fish is 0.93-15.29 mL.g^–1, and ZnCl₄ 2– was the dominant species containing Zn in most of the electrolytes in fresh water and from each concentration variation. This method is expected to provide information that can be used for environmental studies and against toxic effects for food safety.