[1] Bhattacharya P, Welch A H, Stollenwerk K G et al., 2007. Arsenic in the environment:Biology and Chemistry. Science of the Total Environment, 379(2-3):109-120. doi:10.1016/j.scitotenv. 2007.02.037
[2] Bradstreet R B, 1954. Kjeldahl method for organic nitrogen. An-alytical Chemistry, 26(1):185-187. doi:10.1021/ac60085 a028
[3] Cai Q, Long M L, Zhu M et al., 2009. Food chain transfer of cadmium and lead to cattle in a lead-zinc smelter in Guizhou, China. Environtal Pollution, 157:3078-3082. doi:10.1016/j. envpol.2009.05.048
[4] Chai Y, Guo J, Chai S L et al., 2015. Source identification of eight heavy metals in grassland soils by multivariate analysis from the Baicheng-Songyuan area, Jilin Province, Northeast China. Chemosphere, 134:67-75. doi:10.1016/j.chemosphere. 2015.04.008
[5] Chen H W, An J, Wei S H et al., 2015. Spatial patterns and risk assessment of heavy metals in soils in a resource-exhausted city, Northeast China. Plos One, 10(9):e0137694. doi: 10.1371/journal.pone.0137694
[6] Chen H Y, Teng Y G, Lu S J et al., 2015. Contamination features and health risk of soil heavy metals in China. Science of the Total Environment, 512-513:143-153. doi:10.1016/j.scitotenv. 2015.01.025
[7] Cui Y J, Zhu Y G, Zhai R H et al., 2004. Transfer of metals from soil to vegetables in an area near a smelter in Nanning, China. Environment International, 30(6):785-791. doi:10.1016/j. envint.2004.01.003
[8] Guo J H, Liu X J, Zhang Y et al., 2010. Significant acidification in major Chinese croplands. Science, 327(5968):1008-1010. doi: 10.1126/science.1182570
[9] Hakanson L, 1980. An ecological risk index for aquatic pollution control.a sedimentological approach. Water Research, 14(8):75-1001. doi: 10.1016/0043-1354(80)90143-8
[10] Huang Y, Chen Q Q, Deng M H et al., 2018. Heavy metal pollu-tion and health risk assessment of agricultural soils in a typical peri-urban area in southeast China. Journal of Environmental Management, 207:159-168. doi:10.1016/j.jenvman.2017.10. 072
[11] Jiang Y X, Chao S H, Liu J W et al., 2017. Source apportionment and health risk assessment of heavy metals in soil for a town-ship in Jiangsu Province, China. Chemosphere, 168:1658- 1668. doi: 10.1016/j.chemosphere.2016.11.088
[12] Kashem M A, Singh B R, 2001. Metal avialability in contaminated soils. I. Effects of flooding and organic matter on changes in Eh, pH and solubility of Cd, Ni and Zn. Nutrient Cycling in Agroecosystems, 61(3):247-255. doi: 10.1023/A:1013762204510
[13] Ke X, Gui S F, Huang H et al., 2017. Ecological risk assessment and source identification for heavy metals in surface sediment from the Liaohe River protected area, China. Chemosphere, 175:473-481. doi: 10.1016/j.chemosphere.2017.02.029
[14] Li H H, Chen L J, Yu L et al., 2017. Pollution characteristics and risk assessment of human exposure to oral bioaccessibility of heavy metals via urban street dusts from different functional areas in Chengdu, China. Science of the Total Environment, 586:1076-1084. doi: 10.1016/j.scitotenv.2017.02.092
[15] Li X Y, Liu L J, Wang Y G et al., 2013. Heavy metal contamination of urban soil in an old industrial city (Shenyang) in Northeast China. Geoderma, 192:50-58. doi:10.1016/j. ge-oderma.2012.08.011
[16] Li Z Y, Ma Z W, Van Der Kuijp T J et al., 2014. A review of soil heavy metal pollution from mines in China:pollution and health risk assessment. Science of the Total Environment, 468-469:843-853. doi: 10.1016/j.scitotenv.2013.08.090
[17] Liu Huanhuan, Xu Yunlong, Zhao Jie, 2015. Determination of mercury and arsenic in soil by water bath digestion and mi-crowave digestion-atomic fluorescence spectrometry. Journal of Anhui Agricultural Sciences, 43(16):90-92. (in Chinese)
[18] Liu P, Zhao H J, Wang L L et al., 2011. Analysis of Heavy Metal Sources for Vegetable Soils from Shandong Province, China. Journal of Integrative Agriculture, 10(1):109-119. doi:10. 1016/S1671-2927(11)60313-1
[19] Liu Q, Liu J S, Wang Q C et al., 2015. Assessment of heavy metal pollution in urban agricultural soils of Jilin City, China. Human and Ecological Risk Assessment:An International Journal, 21(7):1869-1883. doi: 10.1080/10807039.2014.992854
[20] Liu Q, Wang Y, Liu J S et al., 2014. Comparative assessment of heavy metals in suburban vegetable plots of Changchun, Dehui and Nongan, Northeast China. Fresenius Environmental Bulletin, 23(4):1036-1044.
[21] Lu A X, Wang J H, Qin X Y et al., 2012. Multivariate and geosta-tistical analyses of the spatial distribution and origin of heavy metals in the agricultural soils in Shunyi, Beijing, China. Sci-ence of the Total Environment, 425:66-74. doi:10.1016/j. scitotenv.2012.03.003
[22] Lu X W, Wang L J, Li L Y et al., 2010. Multivariate statistical analysis of heavy metals in street dust of Baoji, NW China. Journal of Hazardous Materials, 173(1-3):744-749. doi:10. 1016/j.jhazmat.2009.09.001
[23] Luo W, Lu Y L, Zhang Y et al., 2010. Watershed-scale assessment of arsenic and metal contamination in the surface soils sur-rounding Miyun Reservoir, Beijing, China. Journal of Envi-ronmental Management, 91(12):2599-2607. doi:10.1016/j. jenvman.2010.07.023
[24] Man Y B, Sun X L, Zhao Y G et al., 2010. Health risk assessment of abandoned agricultural soils based on heavy metal contents in Hong Kong, the world's most populated city. Environment International, 36(6):570-576. doi:10.1016/j.envint.2010. 04.014
[25] Martín J A R, Arias M L, Corbí J M G, 2006. Heavy metals con-tents in agricultural topsoils in the Ebro basin (Spain). Appli-cation of the multivariate geoestatistical methods to study spatial variations. Environmental Pollution, 144(3):1001-1012. doi: 10.1016/j.envpol.2006.01.045
[26] Meng Xianxi, Li Shengzhi, 1995. Study on Background Value of Soil Environment of the Jilin Province. Beijing:Science Press. (in Chinese)
[27] MEPC (Ministry of Environmental Protection of the People's Republic of China), 1997. GB/T 17138-1997 Soil Quali-ty-determination of Copper, Zinc-Flame Atomic Absorption Spectrophotometry. Beijing:Standards Press of China. (in Chinese)
[28] MEPC and SBTS, (Ministry of Environmental Protection of the People's Republic of China and State Bureau of Technical Su-pervision), 1995. GB 15618-1995 Environmental Quality Standard for Soils. Beijing:Standards Press of China. (in Chi-nese)
[29] Micó C, Recatalá L, Peris M, et al., 2006. Assessing heavy metal sources in agricultural soils of an European Mediterranean area by multivariate analysis. Chemosphere, 65(5):863-872. doi: 10.1016/j.chemosphere.2006.03.016
[30] Müller G, 1969. Index of geoaccumulation in sediments of the Rhine River. Geojournal, 2:108-118.
[31] National Bureau of Statistics of China, 2014. Available at:http://www.stats.gov.cn/tjsj/ndsj/2015/indexch.htm. (in Chinese)
[32] Nelson D W, Sommers L E, 1982. Total carbon, organic carbon, and organic matter. In:Page A L (eds.). Methods of Soil Analy-sis. 2nd ed. Madison, WI, USA:Agronomy Society of America and Soil Science Society of America, 539-577.
[33] Pan L B, Ma J, Wang X L et al., 2016. Heavy metals in soils from a typical county in Shanxi Province, China:Levels, sources and spatial distribution. Chemosphere, 148:248-254. doi: 10.1016/j.chemosphere.2015.12.049
[34] Qureshi A S, Hussain M I, Ismail S et al., 2016. Evaluating heavy metal accumulation and potential health risks in vegetables ir-rigated with treated wastewater. Chemosphere, 163:54-61. doi: 10.1016/j.chemosphere.2016.07.073
[35] Ran J, Wang D J, Wang C et al., 2016. Heavy metal contents, distribution, and prediction in a regional soil-wheat system. Science of the Total Environment, 544:422-431. doi:10. 1016/j.scitotenv.2015.11.105
[36] Shan Y S, Tysklind M, Hao F H et al., 2013. Identification of sources of heavy metals in agricultural soils using multivariate analysis and GIS. Journal of Soils & Sediments, 13(4):720-729. doi: 10.1007/s11368-012-0637-3
[37] Shi Pu, 2013. Suitability Evaluation on Land Reclamation of Mining Areas in Jilin City Based on GIS. Changchun:Jilin University. (in Chinese)
[38] State Environmental Protection Administration, 2004. HJ/T 166-2004 The Technical Specification for Soil Environmental Monitoring. Beijing:Standards Press of China. (in Chinese)
[39] Streets D G, Hao J M, Wu Y et al., 2005. Anthropogenic mercury emissions in China. Atmospheric Environment, 39(40):7789-7806. doi: 10.1016/j.atmosenv.2005.08.029
[40] Sun C Y, Liu J S, Wang Y et al., 2013. Multivariate and geostatis-tical analyses of the spatial distribution and sources of heavy metals in agricultural soil in Dehui, Northeast China. Chemo-sphere, 92(5):517-523. doi:10.1016/j.chemosphere. 2013.02.063
[41] Tepanosyan G, Maghakyan N, Sahakyan L et al., 2017. Heavy metals pollution levels and children health risk assessment of Yerevan kindergartens soils. Ecotoxicology and Environmental Safety, 142:257-265. doi: 10.1016/j.ecoenv.2017.04.013
[42] US. EPA, 1989. Risk Assessment Guidance for Superfund Volume I:Human Health Evaluation Manual:(Part A). Washington, DC:Office of Soild Waste and Emergency Response.
[43] US. EPA, 1997. Exposure Factors Handbook. Washington, DC:Environmental Protection Agency.
[44] US. EPA, 2001. Supplemental Guidance for Developing Soil Screening Levels for Superfund Sites. Washington, DC:Office of Solid Waste and Emergency Response.
[45] US. EPA, 2011. Exposure Factors Handbook. Washington, DC:National Center for Environmental Assessment Office of Re-search and Development.
[46] Vu C T, Lin C, Shern C C et al., 2017. Contamination, ecological risk and source apportionment of heavy metals in sediments and water of a contaminated river in Taiwan. Ecological Indicators, 82:32-42. doi: 10.1016/j.ecolind.2017.06.008
[47] Wang Hongyang, 2016. Jilin Yearbook. Beijing:China Statistics Press. (in Chinese)
[48] Wang L J, Tao W D, Smardon R C et al., 2017. Speciation, sources, and risk assessment of heavy metals in suburban veg-etable garden soil in Xianyang City, Northwest China. Frontiers of Earth Science, 1:1-11. doi: 10.1007/s11707-017-0658-8
[49] Xiao Q, Zhong Y T, Lu S G, 2015. Assessment of heavy metal pollution and human health risk in urban soils of steel industrial city (Anshan), Liaoning, Northeast China. Ecotoxicology and Environmental Safety, 120:377-385. doi:10.1016/j. ecoenv.2015.06.019
[50] Yang Z P, Lu W X, Long Y Q et al., 2011. Assessment of heavy metals contamination in urban topsoil from Changchun City, China. Journal of Geochemical Exploration, 108(1):27-38. doi: 10.1016/j.gexplo.2010.09.006
[51] Yu Lei, Zhang Bai, Zhang Shuqing, 2004. Heavy metal elements pollution evaluation on the ecological environment of the San-jiang plain based on GIS. Chinese Journal of Soil Science, 35(5):529-532. (in Chinese)
[52] Zhao L, Xu Y F, Hou H et al., 2014. Source identification and health risk assessment of metals in urban soils around the Tanggu chemical industrial district, Tianjin, China. Science of the Total Environment, 468-469:654-662. doi:10.1016/j. sci-totenv.2013.08.094
[53] Zhu Lilu, Yan Baixing, Wang Lixia, 2011. Quantitative character-istics and source analysis of heavy metals in paddy soils in downstream of the Second Songhua River, Jilin Province. Chinese Journal of Applied Ecology, 21(21):2965-2970. (in Chinese)