《Table 1 Total and bioavailable contents of heavy metals in 56 soil samples》

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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 sample number of the tailing zone is n1=15，the sample of reclaimed zone is n2=13，and the sample of peripheral zone is n3=28.The calculation of the excess rate and excess multiple use the total background value of soil heavy metals in Hainan as the re

As shown in Table 1，the total amount of heavy metals Pb，Zn，Cu，and Cd ranged from 89.96-16 176.72，120.65-10 225.56，1.53-824.26，and 1.28-85，respectively.In addition to the Zn content from the reclaimed zone，all other samples had contents of heavy metals exceeding the standard.The average excess multiples of Pb，Zn，Cu，Cd in the tailing zone，reclaimed zone and peripheral zone ranged from 26.08-214.3，12.73-83.03，6.45-50.3，136.01-496.78；the bioavailable contents of the heavy metal elements Pb，Zn，Cu，Cd ranged from 4.68-2 668.6，2.07-419.84，0.05-109.68，0.04-14.58.The excess rate of Cd was 100%only in the tailing zone and peripheral zone.Although the Pb，Zn，Cu，Cd contents in the reclaimed zone and the Pb，Zn and Cu contents in the peripheral zone did not completely exceed the standard，the average excess multiples were all greater than 1.The results showed that only 2 samples collected from the reclaimed zone had the total amount of heavy metals in surface soil lower than the soil background value of Hainan，while all other samples exceeded the standard.Especially the associated element Cd had the total content range of 1.28-85mg/kg，which was much higher than the background value 0.05mg/kg of Cd content in the soil of Hainan，and the average excess multiple could reach up to 459.76 at the maximum，which was seriously beyond the standard.In the 3 study zones，the bioavailable contents of Ph，Zn，Cu and Cd accounted for no more than 20%of the total contents in the soil of the abandoned lead-zinc mine.Although the proportions of bioavailable contents of heavy metals were low，the bioavailable forms of heavy metals were relatively active，so the bioavailable contents determined the degree of bioavailability and environmental risk，which could better reflect the damage degree of pollutants to animals and plants than the total contents of heavy metals.