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| Geochemical behavior and risk of heavy metals in different size lead-polluted soil particles |
| WU Ting1,2,3, LI Xiao-ping1,2,3, CAI Yue1,2,3, AI Yu-wei1,2,3, SUN Xue-meng1,2,3, YU Hong-tao3 |
1. School of Geography and Tourism, Shaanxi Normal University, Xi'an 710119, China;
2. National Demonstration Center for Experimental Geography Education, Shaanxi Normal University, Xi'an 710119, China;
3. SNNU-JSU Joint Research Center for Nano-environment Science and Health, Shaanxi Normal University, Xi'an 710119, China |
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Abstract In this report, fine particle fractions of sand, silt, coarse clay, and fine clay in lead-polluted soil were extracted through wet extraction. Particle size distribution, heavy metal content, mineral composition, and morphology, as well as their chemical mobility, accumulation factor and ecological health risk were studied using laser particle size analyzer, transmission electron microscopy (TEM), X-ray powder diffraction (XRD), Fourier-transform infrared spectrometer (FTIR) and BCR sequential extraction methods. It is found that the amount of total organic carbon (TOC) and heavy metals in different size fractions of the fine particles increases as the particle size decreases. Accumulation factor, mobility factor and ecological health risk follow the same trend. More importantly, the amount of oxidizable lead also increases as the particle size decreases. Whereas, exchangeable chromium, copper and zinc are mostly accumulated in larger sized soil fine particles. In general, heavy metals in finer particles of lead-polluted soil have higher ecological risk, but especially for Cu and Pb in nano-sized clay particles, which have the greatest accumulation factor and mobility. Therefore, effective remediation and control of heavy metal pollutants in Lead-Polluted Soil should be carried out.
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Received: 08 May 2017
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