《Table 4 Evaluation of geological accumulation index in soils》

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《"Analysis and Evaluation of Bioavailable Heavy Metals in Surface Soil of the Abandoned Lead-zinc Mine in Changhua,Hainan Province"》

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The geological accumulation index is mainly used to evaluate the degree of heavy metal pollution in sediments，and it is also applicable to the evaluation of heavy metal pollution in contemporary soils.Since the lead-zinc mine in Changhua has been mined for a long time，it is necessary to carry out geological accumulation index evaluation to the heavy metals in the mine.As shown in Table4，in terms of the study zones，the pollution degrees were in the order of tailing zone>peripheral zone>reclaimed zone.In terms of the pollution levels of heavy metals，the pollution was in the order of Cd>Pb>Zn>Cu.The pollution of Zn and Cu was of light-medium levels，but the pollution of Zn and Cu in the tailing zone and peripheral zone was of medium levels，while there was no Zn and Cu pollution in the reclaimed zone.The results indicated that among the 4 heavy metal elements，the pollution of Pb and Cd was much more serious，which were the major pollutants in soil.However，the overall evaluation of heavy metals could not truly reflect the pollution of various study zones.Therefore，it is necessary to make a correct evaluation of each study zone in order to formulate reasonable soil remediation measures.