Degradation-resistant chemical contaminants of health concern such as dichlorodiphenyltrichloroethane (DDT) pesticides and polychlorinated biphenyls (PCBs) in the environment are redistributed between different environmental compartments, where they partition between biotic heterotrophic routes and abiotic features (water and immobile soil components). Their fate and the potential risk they pose is a function of translocation, interaction, environmental behavior, and bio-translation/activities. In this study, the partitioning, translocation, bio-translation pathways of 3-DDT and 6-PCB congeners in dosed soils cultured root and leaf vegetables were investigated to predict their soil–vegetable mobility, depuration, and exposure risk. Results showed that PCB_110 and PCB_180 were the least and highest PCBs concentrated in both the leaf and root vegetables. The variations in the 3-DDT and 6-PCB concentrations in the leaf and root vegetables may be attributed to differences in their solubility and partitioning. Total residual mass fraction 3-DDT taken up by the leaf and root vegetables indicated time-dependent preferentiality in pesticide-type vascular tissue translocation to the vegetables. Mann–Whitney non-parametric test showed evidence of spatial variations in levels of the 3-DDT and 6-PCBs across the farmland; however, the variations in the distribution were not significant (P_FML1–FML6 <<P_stat). Risk factors for 3-PCBs and 3-DDT tend to 1(f < 1.0), while that for PCBs_149, 153, and _180 were far less than 0.4 (<1.0). It is therefore uncertain that any immediate health risks could arise from exposure to vegetables containing such congener levels. Continuous exposure to an extrapolated estimate of 25% vegetable population has a 20 ± 10% probability of leading to undesirable chronic effects.

中文翻译：

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选定的多氯联苯和农药的分配，转运途径和环境风险评估

环境中耐健康的耐降解化学污染物（例如二氯二苯基三氯乙烷（DDT）农药和多氯联苯（PCB））在不同的环境区室之间重新分配，它们在生物异养途径和非生物特征（水和固定的土壤成分）之间分配。它们的命运和构成的潜在风险取决于易位，相互作用，环境行为和生物翻译/活性。在这项研究中，研究了在定点土壤中种植的根和叶蔬菜中3-DDT和6-PCB同源物的分配，易位，生物翻译途径，以预测它们在土壤中的蔬菜迁移率，纯净度和暴露风险。结果表明，PCB_110和PCB_180是叶类和块根类蔬菜中浓度最低和含量最高的PCB。叶菜和根菜中3-DDT和6-PCB浓度的变化可能归因于它们溶解度和分配的差异。叶和根类蔬菜吸收的总残留质量分数3-DDT表明农药型维管组织向蔬菜的转运具有时间依赖性。曼恩·惠特尼（Mann-Whitney）非参数检验表明，农田中3-DDT和6-PCBs的水平存在空间差异。但是，分布的变化并不明显（叶和根类蔬菜吸收的总残留质量分数3-DDT表明农药型血管组织向蔬菜的转运具有时间依赖性。曼恩·惠特尼（Mann-Whitney）非参数检验表明，农田中3-DDT和6-PCBs的水平存在空间差异。但是，分布的变化并不明显（叶和根类蔬菜吸收的总残留质量分数3-DDT表明农药型血管组织向蔬菜的转运具有时间依赖性。曼恩·惠特尼（Mann-Whitney）非参数检验表明，农田中3-DDT和6-PCBs的水平存在空间差异。但是，分布的变化并不明显（P _FML1-FML6  << P _stat）。3-PCBs和3-DDT的风险因子趋于1（f  <1.0），而PCBs_149、153和_180的风险因子远小于0.4（<1.0）。因此，不能肯定的是，接触含有此类同源物的蔬菜可能会造成任何直接的健康风险。持续暴露于25％蔬菜人口的推断估计中，有20±10％的可能性导致不良的慢性影响。