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[Heavy Metal Contamination in Farmland Soils at an E-waste Disassembling Site in Qingyuan, Guangdong, South China].
Huan Jing Ke Xue. 2015 Jul; 36(7):2633-40.HJ

Abstract

Crude e-waste dismantling activities have caused a series of environmental pollution problems, and the pollutants released from the dismantling activities would finally pose high risks to human health by means of the accumulation through food chains. To explore the contamination status of heavy metals to the surrounding farmland soils in Longtang and Shijiao Town, Qingyuan, Guangdong, China, 22 farmland soil samples were collected and analyzed for the contents, spatial distributions and chemical forms of 6 heavy metals (Pb, Cu, Cd, Zn, Cr and Ni). The results showed that the 6 heavy metals exhibited obvious accumulations when compared to the corresponding background values in Guangdong Province. According to farmland environmental quality evaluation standard for edible agricultural products HJ 332-2006, the pollution severity of heavy metals was evaluated by monomial pollution index and Nemerow synthetic pollution index methods, the results indicated that 72. 7% of the soil samples contained one or more kinds of heavy metals with higher concentrations than the corresponding standard values, Cd, Cu, Pb and Zn were the main metals in the polluted soils, and for the proportion of contaminated soil samples in all the 22 samples, Cd was the highest, followed by Cu, and finally Pb and Zn. Nemerow synthetic pollution index further revealed that 68. 2% of soil samples were contaminated, and among them 53. 3% of samples were heavily contaminated. Most of the heavy metals were well correlated with each other at the 0. 05 or 0. 01 level, which indicated that primitive e-waste recycling activities were an important source of the heavy metal contamination in Longtang and Shijiao Town. The contents of Cd, Pb, Cu and Zn in surface soils were higher than those of other soil layers, and the contents of these 4 metals in deep soils (20- 100 cm) did not show significant decreases with the increasing depths. The contents of Cr and Ni maintained constant, and exhibited no statistical differences with the sampling depths. Sequential leaching tests showed that the active fractions of Pb, Cu and Cd ranged from 36. 9% to 90. 6%, 39. 6% to 93. 9% and 43. 7% to 99. 6%, with mean values of 61. 3% 65. 3% and 80. 7%, respectively. The active fractions of these three metals in most samples accounted for more than half of their own total contents, which would cause a high ecological risk.

Authors

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Pub Type(s)

Journal Article

Language

chi

PubMed ID

26489335

Citation

Zhang, Jin-lian, et al. "[Heavy Metal Contamination in Farmland Soils at an E-waste Disassembling Site in Qingyuan, Guangdong, South China]." Huan Jing Ke Xue= Huanjing Kexue, vol. 36, no. 7, 2015, pp. 2633-40.
Zhang JL, Ding JF, Lu GN, et al. [Heavy Metal Contamination in Farmland Soils at an E-waste Disassembling Site in Qingyuan, Guangdong, South China]. Huan Jing Ke Xue. 2015;36(7):2633-40.
Zhang, J. L., Ding, J. F., Lu, G. N., Dang, Z., & Yi, X. Y. (2015). [Heavy Metal Contamination in Farmland Soils at an E-waste Disassembling Site in Qingyuan, Guangdong, South China]. Huan Jing Ke Xue= Huanjing Kexue, 36(7), 2633-40.
Zhang JL, et al. [Heavy Metal Contamination in Farmland Soils at an E-waste Disassembling Site in Qingyuan, Guangdong, South China]. Huan Jing Ke Xue. 2015;36(7):2633-40. PubMed PMID: 26489335.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - [Heavy Metal Contamination in Farmland Soils at an E-waste Disassembling Site in Qingyuan, Guangdong, South China]. AU - Zhang,Jin-lian, AU - Ding,Jiang-feng, AU - Lu,Gui-ning, AU - Dang,Zhi, AU - Yi,Xiao-yun, PY - 2015/10/23/entrez PY - 2015/10/23/pubmed PY - 2015/12/15/medline SP - 2633 EP - 40 JF - Huan jing ke xue= Huanjing kexue JO - Huan Jing Ke Xue VL - 36 IS - 7 N2 - Crude e-waste dismantling activities have caused a series of environmental pollution problems, and the pollutants released from the dismantling activities would finally pose high risks to human health by means of the accumulation through food chains. To explore the contamination status of heavy metals to the surrounding farmland soils in Longtang and Shijiao Town, Qingyuan, Guangdong, China, 22 farmland soil samples were collected and analyzed for the contents, spatial distributions and chemical forms of 6 heavy metals (Pb, Cu, Cd, Zn, Cr and Ni). The results showed that the 6 heavy metals exhibited obvious accumulations when compared to the corresponding background values in Guangdong Province. According to farmland environmental quality evaluation standard for edible agricultural products HJ 332-2006, the pollution severity of heavy metals was evaluated by monomial pollution index and Nemerow synthetic pollution index methods, the results indicated that 72. 7% of the soil samples contained one or more kinds of heavy metals with higher concentrations than the corresponding standard values, Cd, Cu, Pb and Zn were the main metals in the polluted soils, and for the proportion of contaminated soil samples in all the 22 samples, Cd was the highest, followed by Cu, and finally Pb and Zn. Nemerow synthetic pollution index further revealed that 68. 2% of soil samples were contaminated, and among them 53. 3% of samples were heavily contaminated. Most of the heavy metals were well correlated with each other at the 0. 05 or 0. 01 level, which indicated that primitive e-waste recycling activities were an important source of the heavy metal contamination in Longtang and Shijiao Town. The contents of Cd, Pb, Cu and Zn in surface soils were higher than those of other soil layers, and the contents of these 4 metals in deep soils (20- 100 cm) did not show significant decreases with the increasing depths. The contents of Cr and Ni maintained constant, and exhibited no statistical differences with the sampling depths. Sequential leaching tests showed that the active fractions of Pb, Cu and Cd ranged from 36. 9% to 90. 6%, 39. 6% to 93. 9% and 43. 7% to 99. 6%, with mean values of 61. 3% 65. 3% and 80. 7%, respectively. The active fractions of these three metals in most samples accounted for more than half of their own total contents, which would cause a high ecological risk. SN - 0250-3301 UR - https://www.unboundmedicine.com/medline/citation/26489335/[Heavy_Metal_Contamination_in_Farmland_Soils_at_an_E_waste_Disassembling_Site_in_Qingyuan_Guangdong_South_China]_ L2 - https://antibodies.cancer.gov/detail/CPTC-CTLA4-1 DB - PRIME DP - Unbound Medicine ER -