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| Concentration characteristics and geoaccumulation index assessment of soil heavy metals in tropical cropsproducing areas of Hainan Island |
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| DOI：10.16768/j.issn.1004-874X.2017.07.010 |
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| Abstract: |
| Investigation and assessment of pollution in heavy metals such as As，Hg，Pb，Cd and Cr in tropical
crops producing areas of Hainan Island were carried out. The concentration characteristics of heavy metals were
evaluated，and the degree of heavy metals pollution was evaluated by means of Geoaccumulation Index. The results
showed that the background value of surface soil in Hainan was taken as the reference standard，and the ratio of As，
Hg and Cr was 4.90，2.00 and 7.73 respectively. The pollution rate was 92.45%，85.53% and 71.70% respectively，
which showed that human activities had caused a certain degree of pollution accumulation of As，Hg and Cr. The
concentration of heavy metals such as As and Cr in some soil samples exceeded the secondary standard of national
soil environmental quality standard. The pollution rate of As and Cr was 0.63% and 43.40% respectively. The
Geoaccumulation Index indicated that some of the soils in the study areas were polluted by heavy metals. The main
manifestation was the Cr pollution in Hongming，Dongchang，Nanhai，Donglu and Nanyang. The Geoaccumulation
Index was 0.83，1.03，0.99，0.72 and 0.62 respectively. |
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