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
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.
吴婷, 李小平, 蔡月, 艾雨为, 孙薛梦, Hongtao Yu. 铅污染不同粒径土壤的重金属地球化学行为与风险[J]. 中国环境科学, 2017, 37(11): 4212-4221.
WU Ting, LI Xiao-ping, CAI Yue, AI Yu-wei, SUN Xue-meng, YU Hong-tao. Geochemical behavior and risk of heavy metals in different size lead-polluted soil particles. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(11): 4212-4221.
Jiang W, Mashayekhi H, Xing B. Bacterial toxicity comparison between nano-and micro-scaled oxide particles[J]. Environmental Pollution, 2009,157(5):1619-1625.
[2]
Wang Z, Xie X, Zhao J, et al. Xylem-and phloem-based transport of CuO nanoparticles in maize (Zea mays L.)[J]. Environmental Science & Technology, 2012,46(8):4434-4441.
[3]
Wang Z, Xu L, Zhao J, et al. CuO nanoparticle interaction with Arabidopsis thaliana:toxicity, parent-progeny transfer, and gene expression[J]. Environmental Science & Technology, 2016, 50(11):6008-6016.
[4]
Li W, He Y, Wu J, et al. Extraction and characterization of natural soil nanoparticles from Chinese soils[J]. European Journal of Soil Science, 2012,63(5):754-761.
Luo X, Yu S, Li X. Distribution, availability, and sources of trace metals in different particle size fractions of urban soils in Hong Kong:implications for assessing the risk to human health[J]. Environmental Pollution, 2011,159:1317-1326.
Weiss E L, Frock H N. Rapid analysis of particle size distributions by laser light scattering[J]. Powder Technology, 1976,14(2):287-293.
[19]
Montero E, Martín M Á. Hölder spectrum of dry grain volume-size distributions in soil[J]. Geoderma, 2003,112(3):197-204.
[20]
Martí M Á. Laser diffraction and multifractal analysis for the characterization of dry soil volume-size distributions[J]. Soil and Tillage Research, 2002,64(1):113-123.
Hakanson L. An ecological risk index for aquatic pollution control. A sedimentological approach[J]. Water Research, 1980, 14(8):975-1001.
[27]
李文彦.土壤天然纳米颗粒提取及其性质和环境行为的表征[D]. 杭州:浙江大学, 2013.
[28]
Acosta J A, Faz Cano A, Arocena J M, et al. Distribution of metals in soil particle size fractions and its implication to risk assessment of playgrounds in Murcia City (Spain).[J]. Geoderma, 2009,149(1/2):101-109.
[29]
Qin F, Ji H, Li Q, et al. Evaluation of trace elements and identification of pollution sources in particle size fractions of soil from iron ore areas along the Chao River[J]. Journal of Geochemical Exploration, 2014,138(3):33-49.
[30]
Jia M, Sun C. Study on adsorption behavior of matal ions on some silicate minerals[J]. Mining & Metallurgy, 2001.
Karadas C, Kara D. Chemometric evaluation for the relation of BCR sequential extraction method and in vitro gastro-intestinal method for the assessment of metal bioavailability in contaminated soils in Turkey[J]. Environmental Science Pollution Research, 2012,(19):1280-129.
