Evaluation of soil heavy metal pollution based on GCM CB model
基于GCM_CB模型的土壤重金属污染评价

Grey clustering method has been applied to the evaluation of soil heavy metal pollution.However,in the process of drawing clustering weights,this method only considers the heavy metal concentration and ignors its biotoxicity index which is an important indicator to measure the toxicity intensity of the heavy metal.In order to reflect the pollution levels of soil heavy metal more objectively and accurately,biotoxicity index was introduced into the clustering weights to build the GCM CB soil heavy metal pollution evaluation model.Soil heavy metal data of 10 areas in eastern China were estimated,appraised and compared with other results evaluated by common evaluation methods.The conclusion is that the majority results are basically same except for sample 4 and sample 9.Their pollution level is changed from level I to level II for the element Hg with high toxicity,which improves the sensitivity of the evaluation method and makes it more coincided with the actual soil contamination of the area.