《Table 3 Results of single factor and Nemerow comprehensive pollution indices and pollution classifi

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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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As shown in Table 3，the evaluation results of single factor pollution index（Pi）showed that the indexes of pollutants from large to small was in the order of Cd>Pb>Cu>Zn，and the level of pollution reached severe level.As for different study zones，the pollution levels were different.The contents of Pb，Zn，Cu，Cd all reached the severe pollution levels in the tailing zone and peripheral zone，while in the reclaimed zone，only Cd and Pb reached the severe pollution levels，and Zn，Cu were of light pollution levels.Comparatively speaking，for the 3 study zones，the pollution in the tailing zone and peripheral zone was more serious，while the pollution in the reclaimed zone was lighter.The evaluation results of Nemerow comprehensive pollution index（PN）showed that the pollution in the tailing zone，reclaimed zone and peripheral zone all reached severe levels，and in the order of tailing zone>peripheral zone>reclaimed zone.The pollution level of the reclaimed zone suggests that the reclamation of heavy metalcontaminated soil is helpful to reduce the degree of pollution，and is conducive to the restoration of abandoned land in the mining area.However，there are still different degrees of pollution in the reclaimed zone，so it still could not grow crops，so as to avoid heavy metals entering the body through the food chain，which can cause harm to human health.