Evaluation of methyltin and butyltin pollution in Beijing Guanting reservoir and its downriver Yongding river

摘要

There is growing concem about the presence of organotin compounds in the environment due to their high bioaccumulation potential, persistence in sediments for periods of up to several years and high toxicities to non-target organisms. However, largeamounts of anthropogenic organotin compounds still pose a toxicological risk and continue to be pollutants in environment because of their wide use in various fields in many countries without legislative regulations such as China. These compounds can bewidely used as stabilizers for PVC, antifouling additives in paint formulations, fungicides and miticides in agriculture (Warren, 1973). The toxicities of these species definitely depend on their chemical forms. In general, the toxicities increase withthe increase of the number of the alkyl substituents and decrease of the carbon chain (Dowling and Uden, 1993). Thereby it is necessary to make the speciation of organotin compounds. Wherein, methyltin and butyltin species, as two kinds of high toxic compounds, have been of great concern. The levels high at ngL~(-1) to mu gL~(-1) have been reported in natural water (Jackson et al., 1982), marine and fresh water (Mueller, 1984), lakes and harbors (Maguire, 1984). As some water is or will be used as drinking water, which is closely linked with people's health, it is of special importance to investigate the pollution of methyltin and butyltin compounds and their sources in such water.