International Joint Research Center for Persistent Toxic Substances, College of Environment, Zhejiang University of Technology, Hangzhou 310014, China.
International Joint Research Center for Persistent Toxic Substances, College of Environment, Zhejiang University of Technology, Hangzhou 310014, China.
Environ Pollut. 2019 Jan;244:667-674. doi: 10.1016/j.envpol.2018.10.094. Epub 2018 Oct 22.
In an attempt to evaluate the behavior of Dechlorane plus (DP) in soil-vegetable systems, this work investigated the uptake and translocation of DP by vegetables and the dissipation of DP in soil under greenhouse and conventional conditions. To address human dietary exposure to DP, estimated dietary intake via vegetable consumption was calculated. The uptake potential indexes of DP from soil into root for tomato and cucumber cultivated under different conditions ranged from 0.089 to 0.71. The ranges of uptake potential indexes of DP from resuspended soil particles into stem, leaf and fruit were 0.68-0.78, 0.27-0.42 and 0.39-0.75, respectively. The uptake potential indexes in greenhouse vegetables were generally higher than those in conventional vegetables when the vegetables had been planted in contaminated soil, indicating that greenhouse enhanced the uptake of DP with a high soil concentration by vegetables. The translocation factor (TF) values of DP in vegetables were in the range of 0.022-0.17, indicating that DP can be transported from root to fruit even though it has a high octanol water partition coefficient (K). The half-lives of DP dissipation in soil ranged from 70 to 102 days. The dissipation of DP in greenhouse soil was slightly slower than that in conventional soil. Higher estimated dietary intake (EDI) values of DP via greenhouse vegetables were observed due to the higher concentration of DP in greenhouse vegetables than conventional vegetables. These results suggested that greenhouses should not be adopted for vegetable production in contaminated regions.
为了评估六氯丁二烯（DP）在土壤-蔬菜系统中的行为，本研究调查了 DP 在蔬菜中的吸收和迁移以及在温室和常规条件下 DP 在土壤中的消解情况。为了评估人类通过蔬菜摄入 DP 的情况，计算了通过蔬菜消费摄入 DP 的估计膳食摄入量。番茄和黄瓜在不同条件下从土壤中吸收 DP 的根向地上部分的吸收潜力指数范围为 0.089-0.71。从悬浮土壤颗粒中吸收 DP 的茎、叶和果实的吸收潜力指数范围分别为 0.68-0.78、0.27-0.42 和 0.39-0.75。当蔬菜种植在污染土壤中时，温室蔬菜的吸收潜力指数通常高于常规蔬菜，表明温室增强了高浓度土壤中 DP 的吸收。蔬菜中 DP 的迁移因子（TF）值在 0.022-0.17 之间，表明 DP 可以从根部运输到果实，尽管它具有较高的辛醇-水分配系数（K）。DP 在土壤中的半衰期范围为 70-102 天。温室土壤中 DP 的消解速度略慢于常规土壤。由于温室蔬菜中 DP 的浓度高于常规蔬菜，因此通过温室蔬菜摄入 DP 的估计膳食摄入量（EDI）值更高。这些结果表明，在污染地区不应该采用温室来种植蔬菜。
