State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Resources Utilization and Protection , Guangzhou Institute of Geochemistry, Chinese Academy of Sciences , Guangzhou 510640 , PR China.
University of Chinese Academy of Sciences , Beijing 100049 , PR China.
Environ Sci Technol. 2018 May 1;52(9):5145-5153. doi: 10.1021/acs.est.8b00616. Epub 2018 Apr 17.
Few studies have examined the accumulation and fate of persistent halogenated organic pollutants (HOPs) in insects. We measured HOPs, including dichlorodiphenyltrichloroethanes (DDTs), polychlorinated biphenyls, and halogenated flame retardants, in insects from four taxonomic groups collected from an e-waste site. Dragonfly larvae collected from a pond contained the highest concentrations of all chemicals except DDTs, while the litchi stinkbugs contained the lowest. Different insect taxa exhibited different contaminant patterns which could be attributed to their habitats and feeding strategies. Bioaccumulation factors for dragonfly larvae and biomagnification factors for moth and grasshopper larvae were significantly positively correlated with the octanol-water partition coefficient of the chemicals (log K < 8). Common nonlinear correlations between the ratio of larval to adult concentrations and log K were observed for all taxa studied. The ratio of concentrations decreased with increasing values of log K (log K < 6-6.5), then increased (6 < log K < 8) and decreased again (log K > 8). This result implies that the mechanism that regulates organic pollutants in insects during metamorphosis is common to all the taxa studied.
鲜有研究考察持久性卤代有机污染物（HOPs）在昆虫体内的积累和归宿。我们测定了取自电子废物拆解场地的 4 个分类群昆虫体内的 HOPs，包括滴滴涕（DDTs）、多氯联苯和卤代阻燃剂。从池塘中采集的蜻蜓幼虫体内的所有化学物质浓度最高，除了滴滴涕，而荔枝蝽象体内的浓度最低。不同的昆虫类群表现出不同的污染物模式，这可以归因于它们的栖息地和取食策略。蜻蜓幼虫的生物积累因子和 moth 以及 grasshopper 幼虫的生物放大因子与化学物质的辛醇-水分配系数（log K < 8）呈显著正相关。对于所有研究的类群，都观察到幼虫与成虫浓度比值与 log K 之间存在常见的非线性关系。随着 log K 值的增加（log K < 6-6.5），浓度比值降低，然后增加（6 < log K < 8），然后再次降低（log K > 8）。这一结果表明，调控昆虫在变态过程中有机污染物的机制在所有研究的类群中是普遍存在的。
