Biological Accumulation And Transformation Of Mercury And Meyhylmercury In Rana Chensinensis And Rana Chensinensis Tadpole

In this disquisition, the research mostly concentrated on the results that the Rana chensinensis which was the typical amphibian in the river- forest wetland of northern China and its tadpole absorbed and concentrated mercury and methyl-mercury. The experiment mainly included Rana chensinensis tadpole Hg²⁺, CH₃Hg exposured and the Hg²⁺ food chain contamination in juvenile Rana chensinensis three partial contents: in the part of the biological accumulation of mercury and methyl-mercury in Rana tadpole, the tadpoles were respectively feed in tap water under Hg²⁺ concentration (0.05, 0.15, 0.25 and 0.40mg/L) and CH₃Hg (0.1, 1.0, 10.0ng/L). The three part, the Hg²⁺ food chain (corn flour-Tenebrio molitor -Rana chensinensis) contamination in juvenile Rana chensinensis, set up two concentration gradient 0.05mg/kg and 0.25mg/kg. The results of this paper were following:â‘ The total mercury concentrations in tadpoles were increased with the mercury concentrations in water with the time extending.â‘¡The methyl-mercury concentrations in tadpoles were also increased with the methyl-mercury concentrations in water and in the same concentration group methyl-mercury concentrations in tadpoles were increased with the time extending.â‘¢The mercury enrichment factor was increased continuously with the extension of the food chain. Furthermore all parts of the juvenile Rana chensinensis body organs of mercury enrichment factor had taken a certain variation. The maximum enrichment factor emergenced in the third day, and then the enrichment factor rapidly reduced. But with the time extending the enrichment factor change was not too big.â‘£The concentration experiment of mercury and methyl-mercury to juvenile Rana and tadpole showed that: organisms were quite sensitive to the heavy metals, mercury could concentrate in organisms although mercury contents was very little in environment, and along the concentration was more in environment, the quantity of enrichment was increased. Simultaneously along with the food chain transmission, the mercury will store up in organism through the nutrition levels and caused massive mercury to concentrate in the high energy magnitude in organisms.