agricultural intensification in the estuarine sediments of Chaohu Lake Valley, East China. Journal of Hazardous Materials 176 (1): 945–951.
19 19 Arora, M., Kiran, B., Rani, S. et al. (2008). Heavy metal accumulation in vegetables irrigated with water from different sources. Food Chemistry 111 (4): 811–815.
20 20 Bradl, H.B. (2005). Sources and origins of heavy metals. In: Interface Science and Technology (ed. H.B. Bradl), 1–27. Amsterdam: Elsevier.
21 21 Buccolieri, A., Buccolieri, G., Dell’Atti, A. et al. (2006). Natural sources and heavy metals. Annali di Chimica 96 (3–4): 167–181.
22 22 Garrett, R.G. (2000). Natural sources of metals to the environment. Human and Ecological Risk Assessment: An International Journal 6 (6): 945–963.
23 23 Dias, G.M. and Edwards, G.C. (2003). Differentiating natural and anthropogenic sources of metals to the environment. Human and Ecological Risk Assessment: An International Journal 9 (4): 699–721.
24 24 Ochieng, E.Z., Lalah, J.O., and Wandiga, S.O. (2009). Anthropogenic sources of heavy metals in the Indian Ocean Coast of Kenya. Bulletin of Environmental Contamination and Toxicology 83 (4): 600–607.
25 25 Zhang, C., Qiao, Q., Appel, E. et al. (2012). Discriminating sources of anthropogenic heavy metals in urban street dusts using magnetic and chemical methods. Journal of Geochemical Exploration 119–120: 60–75.
26 26 Xu, Y., Sun, Q., Yi, L. et al. (2014). The source of natural and anthropogenic heavy metals in the sediments of the Minjiang River Estuary (SE China): implications for historical pollution. Science of the Total Environment 493: 729–736.
27 27 Davis, H.T., Aelion, C., McDermott, S. et al. (2009). Identifying natural and anthropogenic sources of metals in urban and rural soils using GIS‐based data, PCA, and spatial interpolation. Environmental Pollution (Barking, Essex: 1987) 157 (8–9): 2378–2385.
28 28 Pacyna, E.G., Pacyna, J.M., Fudala, J. et al. (2007). Current and future emissions of selected heavy metals to the atmosphere from anthropogenic sources in Europe. Atmospheric Environment 41 (38): 8557–8566.
29 29 Alloway, B.J. (2013). Sources of heavy metals and metalloids in soils. In: Heavy Metals in Soils: Trace Metals and Metalloids in Soils and Their Bioavailability (ed. B.J. Alloway), 11–50. Dordrecht: Springer.
30 30 Bååth, E. (1989). Effects of heavy metals in soil on microbial processes and populations (a review). Water, Air, and Soil Pollution 47 (3): 335–379.
31 31 Jansen, E., Michels, M., van Til, M. et al. (1994). Effects of heavy metals in soil on microbial diversity and activity as shown by the sensitivity‐resistance index, an ecologically relevant parameter. Biology and Fertility of Soils 17 (3): 177–184.
32 32 Leita, L., De Nobili, M., Muhbachova, G. et al. (1995). Bioavailability and effects of heavy metals on soil microbial biomass survival during laboratory incubation. Biology and Fertility of Soils 19 (2): 103–108.
33 33 Kandeler, F., Kampichler, C., and Horak, O. (1996). Influence of heavy metals on the functional diversity of soil microbial communities. Biology and Fertility of Soils 23 (3): 299–306.
34 34 Wang, Y., Shi, J., Wang, H. et al. (2007). The influence of soil heavy metals pollution on soil microbial biomass, enzyme activity, and community composition near a copper smelter. Ecotoxicology and Environmental Safety 67 (1): 75–81.
35 35 Fließbach, A., Martens, R., and Reber, H.H. (1994). Soil microbial biomass and microbial activity in soils treated with heavy metal contaminated sewage sludge. Soil Biology and Biochemistry 26 (9): 1201–1205.
36 36 Chander, K. and Brookes, P.C. (1991). Effects of heavy metals from past applications of sewage sludge on microbial biomass and organic matter accumulation in a sandy loam and silty loam U.K. soil. Soil Biology and Biochemistry 23 (10): 927–932.
37 37 Weng, L., Temminghoff, E., Lofts, S. et al. (2002). Complexation with dissolved organic matter and solubility control of heavy metals in a Sandy soil. Environmental Science & Technology 36 (22): 4804–4810.
38 38 Valsecchi, G., Gigliotti, C., and Farini, A. (1995). Microbial biomass, activity, and organic matter accumulation in soils contaminated with heavy metals. Biology and Fertility of Soils 20 (4): 253–259.
39 39 Reuter, J.H. and Perdue, E.M. (1977). Importance of heavy metal‐organic matter interactions in natural waters. Geochimica et Cosmochimica Acta 41 (2): 325–334.
40 40 Brookes, P.C. (1995). The use of microbial parameters in monitoring soil pollution by heavy metals. Biology and Fertility of Soils 19 (4): 269–279.
41 41 Clemente, R., Escolar, Á., and Bernal, M.P. (2006). Heavy metals fractionation and organic matter mineralisation in contaminated calcareous soil amended with organic materials. Bioresource Technology 97 (15): 1894–1901.
42 42 Barceló, J. and Poschenrieder, C. (1990). Plant water relations as affected by heavy metal stress: a review. Journal of Plant Nutrition 13 (1): 1–37.
43 43 Nagajyoti, P.C., Lee, K.D., and Sreekanth, T.V.M. (2010). Heavy metals, occurrence and toxicity for plants: a review. Environmental Chemistry Letters 8 (3): 199–216.
44 44 Påhlsson, A.‐M.B. (1989). Toxicity of heavy metals (Zn, Cu, Cd, Pb) to vascular plants. Water, Air, and Soil Pollution 47 (3): 287–319.
45 45 Schützendübel, A. and Polle, A. (2002). Plant responses to abiotic stresses: heavy metal‐induced oxidative stress and protection by mycorrhization. Journal of Experimental Botany 53 (372): 1351–1365.
46 46 Ernst, W.H.O. (1996). Bioavailability of heavy metals and decontamination of soils by plants. Applied Geochemistry 11 (1): 163–167.
47 47 Vinodhini, R. and Narayanan, M. (2008). Bioaccumulation of heavy metals in organs of fresh water fish Cyprinus carpio (common carp). International Journal of Environmental Science and Technology 5 (2): 179–182.
48 48 Khan, S., Cao, Q., Zheng, Y.M. et al. (2008). Health risks of heavy metals in contaminated soils and food crops irrigated with wastewater in Beijing, China. Environmental Pollution 152 (3): 686–692.
49 49 Ma, J., Ding, Z., Wei, G. et al. (2009). Sources of water pollution and evolution of water quality in the Wuwei basin of Shiyang river, Northwest China. Journal of Environmental Management 90 (2): 1168–1177.
50 50 Castro‐González, M.I. and Méndez‐Armenta, M. (2008). Heavy metals: implications associated to fish consumption. Environmental Toxicology and Pharmacology 26 (3): 263–271.
51 51 Wang, Q. and Yang, Z. (2016). Industrial water pollution, water environment treatment, and health risks in China. Environmental Pollution 218: 358–365.
52 52 Cheng, S. (2003). Heavy metal pollution in China: origin, pattern and control. Environmental Science and Pollution Research 10 (3): 192–198.
53 53 Uversky, V.N., Li, J., and Fink, A.L. (2001). Metal‐triggered structural transformations, aggregation, and fibrillation of human α‐Synuclein: a possible molecular link between Parkinson's disease and heavy metal exposure. Journal of Biological Chemistry 276 (47): 44284–44296.
54 54 Muchuweti, M., Birkett, J.W., Chinyanga, E. et al. (2006). Heavy metal content of vegetables irrigated with mixtures of wastewater and sewage sludge in Zimbabwe: implications for human health. Agriculture, Ecosystems & Environment 112 (1): 41–48.
55 55 Zhuang, P., McBride, M.B., Xia, H. et al. (2009). Health risk from heavy metals via consumption of food crops in the vicinity of Dabaoshan mine, South China. Science of the Total Environment 407 (5): 1551–1561.
56 56 Singh, A., Sharma, R.K., Agrawal, M. et al. (2010). Health risk assessment of heavy metals via dietary intake of foodstuffs from the wastewater irrigated site of a dry tropical area of India. Food and Chemical Toxicology 48 (2): 611–619.
57 57 Mahmood, A. and Malik, R.N. (2014). Human health risk assessment of heavy metals via consumption of contaminated vegetables collected from different irrigation sources in Lahore, Pakistan. Arabian Journal of Chemistry 7 (1): 91–99.
58 58 Fowler, B.A. (2013). Biological