Effects Of Heavy Metals In Soil Of Farmland On The Safety Of Agricultural Products

"Dead soil disease, there would be no safety tongue",a growing emphasis on the current "pollution on the table", "safety tongue" and the increasingly serious problem of heavy metal pollution of soil quality and safety of agricultural products and problems caused,in this paper, Liangzhou District,Wuwei City as the study area,select botanical garden,Zhoufuzhuang Village of Qingyuan Town,Qingting Village of Gaoba Town, Wangsheng Village of Qingshui Town, Qiaopo Village of Daliu Town,Shahe Village of Xiashuang Town,Wangquan Village of Zhongba Town,Wugou Village of Yangxiaba Town,Dakouzi Village of Jinshan Town,Yingpan Village of Jinshan Town in this district ten key agricultural production areas and agricultural farmland soil as research subjects, focusing on soil heavy metal chromium(Cr), cadmium(Cd), lead(Pb), Nickel(Ni), arsenic(As), and agricultural products of chromium(Cr), cadmium(Cd), lead(Pb), mercury(Hg), arsenic(As) were determined, and "two national soil environmental quality standard"(GB15618-2008), "green food producing environmental quality conditions"(NY / T391-2013) and "the national food safety standards of food hygiene" and "quality standards of agricultural products" as the basis, analysis and evaluation of the extent of soil polluted by heavy metals and agricultural products, the situation, and the depth of soil heavy affect the relationship between the content of heavy metals in the soil and the environment, agricultural products and heavy metal content of agricultural products, soil in the area in order to study the influence of heavy metal content in the safety of agricultural products. The paper also measured soil moisture, p H, organic matter content, and discussed the relationship between the effectiveness of heavy metals and p H, organic matter between. In this paper, results showed:(1) Liangzhou District, Wuwei City only individual production base of agricultural soil of cadmium(Cd), lead(Pb) content is high, but it was not excessive, other chromium(Cr), Nickel(Ni), arsenic(As) content of heavy metals are much lower than the standard value, indicates that the area of farmland soil environmental quality up to the national secondary standard and green food producing environmental standards, compliance with pollution-free agricultural products and green food production origin criteria.(2) Agricultural products cadmium(Cd), lead(Pb) and mercury(Hg) element content higher, chromium(Cr) and arsenic(As) element content is much lower than the standard value, but five heavy metals were not exceeded, pollution levels are safe, pollution levels are clean, description of agricultural products produced in the region in line with national food hygiene standards of food safety and quality standards of agricultural products, belonging pollution-free agricultural products and green food category.(3) Through the association of agricultural soil and farmland in Liangzhou District,Wuwei City heavy metal contents between correlation analysis, found in soil cadmium(Cd), lead(Pb) content of cadmium in agricultural products(Cd), lead(Pb) content have a strong correlation, soil chromium(Cr), arsenic(As) content of the two elements and produce poor correlation, almost no significant correlation, also found a negative correlation with tomatoes arsenic(As) and soil arsenic(As) related or no correlation.(4) Comprehensive evaluation found, the area of agricultural products is high in some heavy metal elements subject to geographical and environmental impacts caused by the high content of heavy metals in soil, in the future should increase the atmosphere, environmental pollution control efforts, improve production and living environment.