Pesticide And Heavy Metals Pollution Research On Grazing Soil,Forage And Cool Meat Of Yak

This paper studied the heavy metals pollution degree and risk assessment on grazing soil,forage and meat of yak.The result showed:1.This experiment adopted single-pollution index,comprehensive-pollution index and underlying ecology risking assessment model of heavy metals pollution for evaluating grazing soil of yak and showed: heavy metals content of grazing soil had not exceeded standard, pollution level is clean,sampling spots are suitable for producing green food. The order of heavy mental comprehensive pollution degree were:NO.2,NO.1,NO.3,NO.4.2.This experiment adopted single-pollution index for evaluating grazing soil quality of yak and showed:the forage quality of NO.1,NO.2,NO.3 are second grade and had light pollution,the forage quality of NO.4 was one grade and pollution level was clean,which did not produce risk for yak.The order of heavy mental comprehensive pollution degree were: NO.2,NO.1,NO.3,NO.4.3.This experiment adopted single-pollution index,comprehensive-pollution indexand heavy metals pollution risking assessment model(American EPA)for evaluating yak's meat and showed: yak's meat were nearly not polluted,and did not produce hazard for exposing consumption body,so it had predominance to produce green food.4. The pesticide residues of organic chlorine and Pyrethroids in the soil, grass and yak meat of Pilot area of the sampling points were not detected. This result showed: the pollution of organic chlorine and Pyrethroids were very slight in the sampling points of soil, grass and yak meat.5.The experimental region had foundmental condition for producing green food of yak,but had slightly compound-pollution,increasing poison effected and potential risked. So it should be done to reduce pollutant discharge,develop touring region conservatively,decrease pollutant transferring context in food chain,which could assure human and animal safe and accord with processing green standard.