Title: Interactions of lead and cadmium on uptake and accumulation by gold fish, Carassius auratus
Abstract: By using simultaneous exposure to Pb and Cd, and exposure to Cd after Pb acclimation,the interaction of the two metals on the branchial uptake and hepatic and renal accumulation in goldfish, Carassius auratus were studied.In the fish exposed to mixtures of constant Cd at 4\^448μmol/L and varied Pb at 0,1\^448,2\^896,4\^344,5\^792,7\^239,and 8\^687 μmol/L in artificial freshwater for ten days,increased branchial uptake and renal accumulation,but not hepatic accumulation,of Pb were observed as Pb concentration went up.The gill uptake and kidney accumulation of Cd were not affected by Pb.The average branchial concentrations (0 026±0 011 mmol/kg fresh weight) and hepatic accumulation of Cd (0 0527±0 0126 mmol Cd/kg fresh weight )in fish exposed to the mixture of constant Cd and varied Pb were not significantly different from those exposed to Cd alone (0 019 mmol Cd/kg fresh weight for gills;0 0395 mmol/kg fresh weight for liver; t \|test,α=0 05).The concentration of Cd accumulated in the kidney tend toward decline.When fish exposed to the mixture of constant Pb at 4 344 μmol/L and varied Cd at 0,0 445,0 890,2 669,4 448,6 227,and 8 006 μmol/L,the branchial uptake and hepatic and renal accumulations of Cd linearly increased with increased concentrations of free ions Cd 2+ in the ambient water.The gill uptake and kidney accumulations of Pb decreased with increase in concentrations of free ions Cd 2+ .However,the accumulation of Pb in the liver (0 0103±0 0059 mmol/kg wet weight)was not influenced by Cd exposure,which was not significant different from that (0 0097mmol Pb/kg fresh weight)of fish exposed to the Pb alone ( t \|test,α=0 05).For the fish exposed to constant Pb at 4\^344 μmol/L for five days after adaptation to Cd exposure at varied concentrations,it was found that uptake of Cd in the gills and accumulations of Pb in the liver and kidney linearly increased with increased concentration of free Cd 2+ in the ambient water.While branchial uptake and hepatic and renal accumulations of Pb were not significantly different from the background concentrations of Pb in the gills,liver and kidney,respectively ( α =0 05),indicating that acclimation of Cd had no effect on branchial Pb uptake and hepatic and renal Pb accumulations.
Publication Year: 2001
Publication Date: 2001-01-01
Language: en
Type: article
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