Residual Characteristics of Organochlorine Pesticides in Vegetable Soils from the Middle of Yuanmou

Chen, Shan Shan; Deng, Xiao; Liu, Jing Kun; Li, Qin Fen; Wu, Chaoqun

doi:10.4028/www.scientific.net/amm.522-524.769

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“…For heavy metals, the contamination levels of Pb and Cu in the present study were higher than those reported from the surface soils in other study areas of China, such as Shangdan Valley in Northwest China (Zhuang & Lu, 2020), the farmland soils adjoining steel plants in Tangshan city of Hebei province (Yang et al, 2018), as well as in suburb cropland in Suzhou City of Anhui province (Li, 2013), however, the levels of Zn and Cr in this study were lower than the levels in the surface soil samples collected in Shangdan Valley, Tangshan city and Suzhou City. For OCPs, the levels of ∑HCHs detected in the present study were much greater than those reported from the vegetable soils in Yuanmou County of Yunnan province (Chen et al, 2014), and were compatible with those collected from urban soils in Wuhan (Tadesse, 2021). The contamination levels of HCHs in this study were significantly less than those in soils surrounding the Tanggu Chemical Industrial District of Tianjin (Hou et al, 2013b).…”

Section: K Hou Et Alsupporting

confidence: 76%

Status, Distribution and Ecological Risk Assessment of Persistent Toxic Substances in Suburban Agricultural Soils in Hohhot City, North China

Hou¹,

Long²,

Liu³

et al. 2023

GEP

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A total of 52 soil samples of Hohhot City were collected and four heavy metals and eight organochlorine pesticides were analyzed. The results showed that Cr, Cu, Zn, and Pb in soil were in range of 20.54 -48.15 mg/kg, 40.10 -94.60 mg/kg, 35.14 -110.48 mg/kg, 38.86g -245.36 mg/kg, with a mean value of 37.24 mg/kg, 60.76 mg/kg, 80.49 mg/kg, and 145.99 mg/kg, respectively. The high degree of variation of Pb, Zn, and Cu, reflected that the heavy metals were mainly interfered by human factors. The content values of ∑DDTs ranged from 5.01 ng/g to 105.08 ng/g with a mean of 36.94 ng/g, while the ∑HCHs ranged from 6.52 ng/g to 48.65 ng/g with an average of 23.29 ng/g, indicated that DDTs were highly used than HCHs in the study area. The relatively low α-HCH/γ-HCH ratio and relatively high o,p'-DDT/p,p'-DDT ratio indicated the application of lindane and dicofol on regional agricultural soil. The mean Igeo values was Pb (2.9) > Cu (1.5) > Cr (−0.31) > Zn (−0.35), revealing that the soil in Hohhot City was not polluted by Cr and Zn (Igeo < 0), moderate polluted by Cu (1 < Igeo < 2), moderate to heavy pollution by Pb (2 < Igeo < 3). The range of potential ecological risk index of metals was from 35.02 to 132.96, indicating low to moderate potential ecological risk. HCHs in all soil samples were less than 50 ng/g, which could be considered as unpolluted, while DDTs in several samples were between 50 and 500 ng/g, which could be regarded as having low pollution.

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