Abstract：In order to scientifically evaluate the risks of heavy metal-contaminated soil to human health, the bioaccessibility of As, Cd, Cu, Pb and Zn in the soil of a smelting plant was tested by PBET and IVG, and the bioaccessibility-based health risks were compared with the ones based on total amount of heavy metals. The results showed that the average contents of As, Cd and Pb were up to 7063, 691 and 3811mg/kg, respectively, which seriously exceeded the Chinese environmental standard. In PBET and IVG tests, the average bioaccessibility of the 5 heavy metals ranged from 1.81% to 44.8% and 1.78% to 30.1%, respectively. As was the highest bioaccessible heavy metal in PBET test, while it was Cd in IVG test. Pb showed the lowest bioaccessibility because of phosphorous minerals. The above differences could be attributed to the pH and components of extracting solutions, which had chemical interaction with heavy metals. Under the hypotheses in the model, the total hazardous quotient and total carcinogenic risk were 27.2 and 2.95×10-3. Based on bioaccessibility, the two coefficients could be reduced by 59.9%~84.4% and 55.6%~79.4%, respectively, following the order: PBET gastric solution > PBET intestinal solution > IVG gastric solution > IVG intestinal solution in these two coefficients. It also could be considered that Pb no longer had health risk, Cd had carcinogenic risk, and only As had both non-carcinogenic risk and carcinogenic risk. Although there is still a nonnegligible human health risk in this site, the hazardous levels of heavy metals can be identified and excessive site remediation should be avoided after considering the bioaccessibility of heavy metals.
冯康宏, 范缙, Lik Ung Stanley Hii, 罗启仕, 曹心德, 续晓云. 基于生物可给性的某冶炼厂土壤重金属健康风险评价[J]. 中国环境科学, 2021, 41(1): 442-450.
FENG Kang-hong, FAN Jin, Lik Ung Stanley Hii, LUO Qi-shi, CAO Xin-de, XU Xiao-yun. Human health risk assessment of heavy metals in soil from a smelting plant based on bioaccessibility. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(1): 442-450.
Jiang M, Zeng G M, Zhang C, et al. Assessment of heavy metal contamination in the surrounding soils and surface sediments in Xiawangang River, Qingshuitang District[J]. Plos One, 2013,8(8):e71176.
[2]
Zhang X W, Wei S, Sun Q Q, et al. Source identification and spatial distribution of arsenic and heavy metals in agricultural soil around Hunan industrial estate by positive matrix factorization model, principle components analysis and geo statistical analysis[J]. Ecotoxicology and Environmental Safety, 2018,159:354-362.
[3]
Sun Y M, Li H, Guo G L, et al. Soil contamination in China:Current priorities, defining background levels and standards for heavy metals[J]. Journal of Environmental Management, 2019,251:109512.
[4]
Rodrigues S M, Cruz N, Carvalho L, et al. Evaluation of a single extraction test to estimate the human oral bioaccessibility of potentially toxic elements in soils:Towards more robust risk assessment[J]. Science of The Total Environment, 2018,635:188-202.
[5]
Du H L, Yin N Y, Cai X L, et al. Lead bioaccessibility in farming and mining soils:The influence of soil properties, types and human gut microbiota[J]. Science of the Total Environment, 2020,708:135227.
[6]
王锐,胡小兰,张永文,等.重庆市主要农耕区土壤Cd生物有效性及影响因素[J]. 环境科学, 2020,41(4):1864-1870. Wang R, Hu X L, Zhang Y W, et al. Bioavailability and influencing factors of soil Cd in the major farming areas of Chongqing[J]. Environmental Science, 2020,41(4):1864-1870.
[7]
罗梅,柏宏成,陈亭悦,等.腐殖酸对土壤铅镉吸附、赋存形态及生物可给性的影响[J]. 中国环境科学, 2020,40(3):1191-1202. Luo M, Bai H C, Chen T Y, et al. Effects of humic acids on the adsorption, chemical speciation, and bioaccessibility of soil lead and cadmium[J]. China Environmental Science, 2020,40(3):1191-1202.
[8]
郑瑞,彭超,钟茂生,等.基于我国人群胃肠消化特征的土壤中As的人体可给性研究[J]. 中国环境科学, 2019,39(1):235-242. Zheng R, Peng C, Zhong M S, et al. Study on arsenic bioaccessibility in soil based on Chinese gastrointestinal digestion characteristics[J]. China Environmental Science, 2019,39(1):235-242.
[9]
孙立强,孙崇玉,刘飞,等.淮北煤矿周边土壤重金属生物可给性及人体健康风险[J]. 环境化学, 2019,38(7):1453-1460. Sun L Q, Sun C Y, Liu F, et al. Bioaccessibility and health risk assessment of heavy metals in the soil around Huaibei coal mining area[J]. Environmental Chemistry, 2019,38(7):1453-1460.
[10]
US EPA. Soil bioavailability at superfund sites:Guidance[EB/OL]. https://www.epa.gov/superfund/soil-bioavailability-superfund-sites-guidance, 2017.
[11]
US EPA. Standard operating procedure for an In Vitro bioaccessibility assay for lead and arsenic in soil[S].
[12]
US EPA. Risk assessment guidance for superfund:Volume III-Part A, process for conducting probabilistic risk assessment[EB/OL]. https://www.epa.gov/sites/production/files/2015-09/documents/rags3adt_complete.pdf, 2001.
[13]
Juhasz A L, Weber J, Smith E, et al. Assessment of four commonly employed in vitro arsenic bioaccessibility assays for predicting in vivo relative arsenic bioavailability in contaminated soils[J]. Environmental Science & Technology, 2009,43(24):9487-9494.
[14]
陈廷廷,侯艳伟,蔡超,等.应用四种体外消化方法比较研究场地土壤中重金属的生物可给性及其人体健康风险[J]. 环境化学, 2018, 37(11):2342-2350. Chen T T, Hou Y W, Cai C, et al. Bioaccessibility and human health risk assessement of heavy metals in soils by using four in vitro digestion methods[J]. Environmental Chemistry, 2018,37(11):23422350.
[15]
鲁如坤.土壤农业化学分析方法[M]. 北京:中国农业科技出版社, 2000:12-14. Lu R K. Analysis method of agricultural chemistry in soil[M]. Beijing:Agriculture and Science Press, 2000:12-14.
[16]
Schumacher B A. Methods for the determination of total organic carbon (TOC) in soils and sediments[M]. Las Vegas:US EPA, 2002:7-9.
[17]
Fan J, Zhao L, Kan J H, et al. Uptake of vegetable and soft drink affected transformation and bioaccessibility of lead in gastrointestinal track exposed to lead-contaminated soil particles[J]. Ecotoxicology and Environmental Safety, 2020,194:110411.
[18]
Ruby M V, Davis A, Schoof R, et al. Estimation of lead and arsenic bioavailability using a physiologically based extraction test[J]. Environmental Science & Technology, 1996,30(2):422-430.
[19]
Rodriguez R R, Basta N T. An in vitro gastrointestinal method to estimate bioavailable arsenic in contaminated soils and solid media[J]. Environmental Science & Technology, 1999,33(4):642-649.
[20]
HJ 25.3-2014污染场地风险评估技术导则[S]. HJ 25.3-2014 Technical guidelines for risk assessment of contaminated sites[S].
[21]
李继宁,侯红,魏源,等.株洲市农田土壤重金属生物可给性及其人体健康风险评估[J]. 环境科学研究, 2013,26(10):1139-1146. Li J N, Hou H, Wei Y, et al. Bioaccessibility and health risk assessment of heavy metals in agricultural soil from Zhuzhou, China[J]. Research of Environmental Sciences, 2013,26(10):1139-1146.
[22]
Hu X, Zhang Y, Luo J, et al. Bioaccessibility and health risk of arsenic, mercury and other metals in urban street dusts from a mega-city, Nanjing, China[J]. Environmental Pollution, 2011,159(5):1215-1221.
[23]
蒋颖,司马菁珂,赵玲,等.上海市居民区与工业区大气颗粒物重金属生物可给性与健康风险评估[J]. 环境化学, 2016,35(7):13371345. Jiang Y, Sima J K, Zhao L, et al. Bioaccessibility and health risk of heavy metals in particulate mattersfrom residential and industrial areas in Shanghai, China[J]. Environmental Chemistry, 2016,35(7):13371345.
[24]
生态环境部.中国人群暴露参数手册(成人卷)[M]. 北京:中国环境出版社, 2013:27-31. Ministry of Ecological Environment. Chinese population exposure parameters manual (Adult volume)[M]. Beijing:China Environmental Press, 2013:27-31.
[25]
US EPA. Soil screening guidance:User's guide-attachment D:Regulatory and human health benchmarks for SSL development[EB/OL]. https://semspub.epa.gov/work/HQ/175240.pdf, 1996.
[26]
魏复盛,陈静生,吴燕玉,等.中国土壤环境背景值研究[J]. 环境科学, 1991,12(4):12-19. Wei F S, Chen J S, Wu Y Y, et al. Study on the background contents on elements of soils in China[J]. Environmental Science, 1991,12(4):12-19.
[27]
Li Z Y, Ma Z W, Van der kuijp T J, et al. A review of soil heavy metal pollution from mines in China:pollution and health risk assessment[J]. Science of the Total Environment, 2014,468:843-853.
[28]
GB 36600-2018土壤环境质量建设用地土壤污染风险管控标准[S]. GB 36600-2018 Soil environmental quality:Risk control standard for soil contamination of development land[S].
[29]
Honma T, Ohba H, Kaneko-Kadokura A, et al. Optimal soil Eh, pH, and water management for simultaneously minimizing arsenic and cadmium concentrations in rice grains[J]. Environmental Science & Technology, 2016,50(8):4178-4185.
[30]
Liu C P, Yu H Y, Liu C S, et al. Arsenic availability in rice from a mining area:Is amorphous iron oxide-bound arsenic a source or sink?[J]. Environmental Pollution, 2015,199:95-101.
[31]
Li H B, Li M Y, Zhao D, et al. Arsenic, lead, and cadmium bioaccessibility in contaminated soils:Measurements and validations[J]. Critical Reviews in Environmental Science and Technology, 2020,50(13):1303-1338.
[32]
Pelfrêne A, Waterlot C, Mazzuca M, et al. Bioaccessibility of trace elements as affected by soil parameters in smelter-contaminated agricultural soils:A statistical modeling approach[J]. Environmental Pollution, 2012,160:130-138.
[33]
Liu S Y, Tian S H, Li K X, et al. Heavy metal bioaccessibility and health risks in the contaminated soil of an abandoned, small-scale lead and zinc mine[J]. Environmental Science and Pollution Research, 2018,25(15):15044-15056.
[34]
李仪,章明奎.三种模拟消化液对土壤重金属的提取性比较[J]. 中国环境科学, 2012,32(10):1807-1813. Li Y, Zhang M K. Comparison of soil heavy metals extraction using three in-vitro digestion tests[J]. China Environmental Science, 2012,32(10):1807-1813.
[35]
Alava P, Du Laing G, Odhiambo M, et al. Arsenic bioaccessibility upon gastrointestinal digestion is highly determined by its speciation and lipid-bile salt interactions[J]. Journal of Environmental Science and Health, Part A, 2013,48(6):656-665.
[36]
司马菁珂.污染土壤铅在模拟人体消化系统内的形态转化与生物可利用性研究[D]. 上海:上海交通大学, 2018. Sima J K. Transformation and bioaccessibility of contaminated soil lead in simulated human gastrointestinal tract[D]. Shanghai:Shanghai Jiao Tong University, 2018.
[37]
Zong Y T, Xiao Q, Lu S G. Chemical fraction, leachability, and bioaccessibility of heavy metals in contaminated soils, Northeast China[J]. Environmental Science and Pollution Research, 2016,23(23):24107-24114.
[38]
Li J N, Wei Y, Zhao L, et al. Bioaccessibility of antimony and arsenic in highly polluted soils of the mine area and health risk assessment associated with oral ingestion exposure[J]. Ecotoxicology and environmental safety, 2014,110:308-315.
[39]
DB 43/T1165-2016重金属污染场地土壤修复标准[S]. DB43/T1165-2016 Standards for soil remediation of heavy metal contaminated sites[S].
