[Characteristics of arsenic content in the livestock farms' surrounding environment in Shanghai suburbs].

In the suburbs of Shanghai, selected five large farms and surface water, feed, soil and vegetable samples were collected, and then total and inorganic arsenic were detected to survey the current arsenic level of the livestock farms in Shanghai suburban, as well as the usage situation of organic arsenic as feed additives. The results showed that the total arsenic content in water samples ranged from 0. 00 microgL-1 to 23.00 microg L-1 , below the first standard of surface water quality (50 microg L-1 ) ; total arsenic in feed was among 0.40-12.13 mgkg-1 , in which inorganic arsenic was 10.0% -80.0% ; total arsenic in spot-checking feed samples was 0. 16-21.39 mg kg-1 and inorganic arsenic was 0. 003-10. 67 mgkg-1 , and samples exceeding the limits of arsenic in feed accounted for 16. 7% ; total arsenic content in soils ranged from 8.08-18.50 mgkg-1 , in which 22. 2% samples were higher than the first standard of soil environmental quality, and inorganic arsenic accounted for 44. 2% -78. 9% of total arsenic; vegetables' total arsenic was 0. 003-0. 093 mg kg-1, not higher than the maximal residue limit of 0. 50 mg kg -1 on the current national standard; there were some differences in different parts of the same species vegetables on arsenic content: arsenic content in roots were higher than that in the aboveground part, and the bioconcentration factors showed a significantly positive correlation with the arsenic content in vegetables and a negative correlation with the arsenic content in rhizosphere.