Evaluation And Evaluating Methods Of Heavy Metal Pollution In Main Soils Of Anhui Province

The content and spatial distribution of heavy metals,including Zn,Cr,Cu,Ni,Pb and Cd,in main soils of Anhui province was studied.On base of this,a new and objective pollution evaluation method was put forward by analyzing all the data of heavy metals in topsoils,with a new pollution index system erected.At the same time,The content of organic matter and value of pH in Soils was mensurated by the general method.The evaluation pollution of heavy metals in soils of Anhui Province carried through with the single pollution index and Nemerow index and the regular fuzzy mathematics model and with different land uses:The most important method for soil heavy metal pollution evaluation was brought forward.In the new approach for evaluating soil heavy metals pollution,the graduation feature and fuzzy feature, together with the biological toxicology were comprehensively considered,Then the method for calculating weighted average in the regular fuzzy mathematics model for soil heavy metal evaluation was ameliorated.A new fuzzy mathematics model was put forward by introducing the standard toxic response factor formulated by Hakanson.Finally,soil heavy metals pollution in main soil in Anhui province was assessed by using both the new and the regular methods.The most results as following:1.No accumulation of Zn,Cr,Cu,Ni,Pb in Yellowish red soils.Cu accumulates but the others don't accumulate in Shajiang black soils.The Yellow-cinnamon soils has been contaminated by Zn,Cu,Pb.Cr is no accumulation but Zn,Cu,Ni,Pb,Cd are accumulated with Cd most grave.2.Industrial waste sewage for irrigation is major point pollution sources for Zn,Cu,Pb in three main soils.Land use impact on the content of heavy metals in soils greately.Long-term large farm inorganic materials(especially phosphorus)is the major cause of pollution of heavy metals in greenhouse soils.3.Environmental quality in main soils of Anhui Province merits of the order: Shajiang black soils＞yellow red soils＞Yellow-cinnamon soils＞Shajiang Black soils (Guzhen city,Greenhouse)4.The new model highlighted the toxicity of heavy metals in the soil contribute to the quality of the environment,put heavy metal pollution into the soil at different levels,that is,to double the content and toxicity of indicators to assess the extent of soil pollution;Conventional models of the heavy metal toxicity to soil contributed only indicators to evaluate the content of heavy metals on soil pollution levels.5.Single factor index,the Composite Index and the new evaluation of the results of the assessment and evaluation procedures of heavy metal pollution evaluation more objective and rational.Finally,the initial establishment of a local heavy metal soil pollution limit value formed in allusion to Anhui soil actual situation,...