The distribution characteristics of chrome,copper,zinc,lead,cadmium and mercury in sediments of aquaculture ponds of the Wantan town in Zhongmu,Henan province were investigated,and those pollution assessment of Nemerow multi- factor index method was fulfilled. The primary pollution of heavy metals was chrome. The average content of chrome was 53. 35 mg / kg,and its over- limit ratio for environmental requirements for origin of non- environmental pollution aquatic products was 6. 7%. The content range of cad...