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[求助补充材料] Residues, spatial distribution and risk assessment of DDTs and HCHs in agricultural soil and crops from the Tibetan Plateau
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Due to its high elevation and cold temperature, the Tibetan Plateau (TP) is regarded as the “Third Pole”. Different from other polar regions, which are truly remote, the TP has a small population and a few agricultural activities. In this study, agricultural soil and crop samples (including highland barley and rape) were collected in the main farmland of the TP to obtain the contamination levels of dichlorodiphenyltrichloroethane (DDT) and hexachlorocyclohexane (HCH) in the Tibetan agricultural system as well as the relevant human exposure risks. The average concentrations of DDTs and HCHs in the agricultural soil, highland barley and rape were 1.36, 0.661, 1.03 ng/g dw and 0.349, 0.0364, 0.0225 ng/g dw, respectively. In the agricultural soil, DDTs and HCHs matabolism (DDE, DDD and b-HCH) were abundant, which indicated a “historical” source, whereas crops contained a similar composition ((DDE þ DDD)/DDT, |
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(2025-6-4)
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