Sources and Risk Assessment of Heavy Metal in Agricultural Soils Based on the Environmental Geochemical Baselines
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Supported by the Financial Fund of Zhejiang Province in China (No. 2016009) and the National Natural Science Foundation of China (No. 41877005)

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    Abstract:

    【Objective】To study the characteristics and risk of heavy metal contents in the agricultural soils highly disturbed by anthropogenic activities in the suburbs of a City, Zhejiang Province, Southeast China, and to establish Environmental Geochemical Baseline models of heavy metal elements, a total of 534 topsoil samples were collected in the study areas.【Methods】 The contents of heavy metals, As, Cr, Cd, Cu, Hg, Ni, Pb, Zn, and inert elements, Li, Eu, Sc and Sm in the soils were analyzed. As and Hg were measured with the atomic fluorescence spectrometry; Pb and Zn, with the X-ray fluorescent spectroscopy (XRF); Cd, Cu, Ni, Li, Eu, Sc and Sm, with the inductively coupled plasma mass spectrometry (ICP-MS). Using Li, Eu, Sc and Sm as standard factors, the Environment Geochemical Baseline models of the heavy metal elements were established. According to the Risk Control Standard for Soil Contamination of Agricultural Land (GB 15618-2018),the method of Single Factor Pollution Index were applied to assess the degree of heavy metal pollution in the study areas. While the enrichment factor (EF)and the potential ecological risk (PER) by individual metal and combined effect of metals were determined, by using the Environment Geochemical Baseline Values as standard factors.【Results】 The contents of heavy metal elements, As, Cd, Cr, Cu, Hg, Ni, Pb and Zn in the soils were in the ranges of 2.28~106.0 mg·kg-1, 0.04~4.91 mg·kg-1, 16.00~221.0 mg·kg-1, 12.90~216.0 mg·kg-1, 0.03~2.31 mg·kg-1, 6.76~102.0 mg·kg-1, 12.40~245.0 mg·kg-1 and 51.70 ~864.0 mg·kg-1, respectively.Choose the inert elements with the best correlations to heavy metals as the standard factors to obtain the Environment Geochemical baselines of As 11.13mg·kg-1, Cd 0.38mg·kg-1, Cr 57.49 mg·kg-1, Cu 43.86 mg·kg-1, Hg 0.30 mg·kg-1, Ni 21.55 mg·kg-1, Pb 51.91 mg·kg-1 and Zn 132.68 mg·kg-1. A polluted rate of the monitoring points of the different heavy metals was in the decreasing order of Cd 59.55%> Cu 24.34%>Hg 17.42%>Pb 13.11%>Zn 12.36%> As2.81%>Cr 0.37%=Ni 0.37%.The concentration of Cd, Cr, Cu, Hg, Ni, and Pb were higher than the Environment Geochemical Baseline Values in more than 40% of samples; those heavy metal elements were anthropogenically loaded into the agricultural soils of the study areas. Although large area of he study areas experienced moderate to serious level of pollution, most of the heavy metals showed low risk to the environment. Only Cd and Hg showed moderate to high risk to the environment.【Conclusions】Spatial analyses of EF and PER of the heavy metal elements by applying the GIS information system can effectively determine the source and scope of heavy metal pollution,and assess the potential ecological risks of heavy metal pollution for early warning in the study areas. Over 68.91% of the agricultural soils in the study areas were polluted by heavy metals to different extents, and 3.18% were severely polluted due to intensive anthropogenic activities. The polluted areas were mainly distributed nearby metal mines and printing and dyeing companies.

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LU Xinzhe, GUAnqing, ZHANG Yanwu, KANG Zhanjun, HU Xuefeng, CHU Xianyao. Sources and Risk Assessment of Heavy Metal in Agricultural Soils Based on the Environmental Geochemical Baselines[J]. Acta Pedologica Sinica,2019,56(2):408-419.

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History
  • Received:January 19,2018
  • Revised:August 27,2018
  • Adopted:October 09,2018
  • Online: December 21,2018
  • Published: