广州市从化区耕地土壤重金属风险评价

doi:10.16088/j.issn.1001-6600.2020.05.015

Abstract

Abstract: Soil is an important part of the environment. Excessive heavy metals entering the soil cycle will not only lead to the decline of soil quality, soil productivity and food security, but also affect human health. Based on 76 sampling sites in Conghua District of Guangzhou city, the risk assessment of five heavy metals Cd, Hg, As, Pb and Cr in cultivated soil was carried out by using Hakanson potential ecological risk index and health risk assessment method. The results showed that the content of each heavy metal was in the order as follow: Cr(78.690±38.160 mg·kg^-1), Pb(54.300±18.120 mg·kg^-1), As(10.280±7.230mg·kg^-1), Hg(0.163±0.050 mg·kg^-1), Cd(0.160±0.050mg·kg^-1). The contribution rate to the potential ecological risk of soil is as follow: Cd,Hg,As,Pb,and Cr. The potential ecological risk indexes of heavy metals Cd and Hg were mainly at medium and high ecological risk levels, while the other three heavy metals were all at slight ecological risk levels. The comprehensive potential ecological risk index was mainly at medium ecological risk level. The non-carcinogenic risk mainly comes from heavy metal Cr, among which the total risk of multi-pathway non-carcinogenic in children was about 7 times that of adults. The total carcinogenic risk of heavy metals As and Cd is 1.997×10^-3, and there was a carcinogenic risk. The results showed that there was a certain pollution risk of heavy metals in the cultivated soil of Conghua District, and the corresponding prevention and control measures should be strengthened in the actual production and life.

Key words: the cultivated land, heavy metals, potential ecological risk assessment, health risk assessment, Conghua district, Guangzhou City

CLC Number:

PENG Limei, ZHAO Li, ZHOU Wu, HU Yueming. Risk Assessment of Heavy Metals in Cultivated Land in Conghua District of Guangzhou City, China[J].Journal of Guangxi Normal University(Natural Science Edition), 2020, 38(5): 118-129.

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Risk Assessment of Heavy Metals in Cultivated Land in Conghua District of Guangzhou City, China

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