Wang Shunhui, Lao Wenjian, Li Huizhen, Guo Liang, You Jing
School of Environment and Guangdong Key Laboratory of Environmental Pollution and Health, Jinan University, Guangzhou, China, 511443; State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, China, 610500.
Southern California Coast Water Research Project Authority, Costa Mesa, California, United States, 92626.
Sci Total Environ. 2023 Mar 10;863:160514. doi: 10.1016/j.scitotenv.2022.160514. Epub 2022 Nov 25.
The degradates of fipronil have equivalent or even more toxicity to non-target aquatic invertebrates. To assess their environmental risks, information of bioaccumulation is required. Currently, little is known about the bioaccumulative property of fipronil degradates in sediment, while it is well known that passive sampler may measure bioavailable concentration (C) which links with the environmental effect more tightly than the total environment concentration. The goal of the present study was to characterize bioaccumulation potential in oligochaete Lumbriculus variegatus for a fipronil degradate sulfide. The sediment organic carbon-water partition coefficient (K) was measured with polymethyl methacrylate (PMMA) film passive sampler, and K was used to bridge the gap between biota-sediment accumulation factor (BSAF) and bioconcentration factor (BCF). The bioavailable concentration (C)-based K values were 5371 ± 152 and 5013 ± 152 (mL/g OC) for fipronil sulfide (FSI) and sulfone (FSO), respectively. Since the two fipronil degradates were produced continuously in sediment by the parent compound, the time-weighted-average (TWA) concentration of FSI in the sediment was estimated from a bioassay with L. variegatus to calculate BSAF value (0.581 ± 0.211 g OC/g lipid) and BCF (3046 ± 1103 or log 3.48 ± 0.16 mL/g). This approach is able to estimate the C-based K and BCF values of fipronil degradate in sediment with ongoing degradation of the parent compound.
氟虫腈的降解产物对非目标水生无脊椎动物具有同等甚至更高的毒性。为评估其环境风险，需要生物累积信息。目前，关于氟虫腈降解产物在沉积物中的生物累积特性知之甚少，而众所周知，被动采样器可以测量生物可利用浓度（C），该浓度与环境效应的联系比总环境浓度更为紧密。本研究的目的是表征氟虫腈降解产物硫化物在寡毛纲颤蚓中的生物累积潜力。使用聚甲基丙烯酸甲酯（PMMA）膜被动采样器测量沉积物有机碳 - 水分配系数（K），并利用K来弥合生物群 - 沉积物累积因子（BSAF）和生物浓缩因子（BCF）之间的差距。基于生物可利用浓度（C）的氟虫腈硫化物（FSI）和砜（FSO）的K值分别为5371 ± 152和5013 ± 152（mL/g OC）。由于这两种氟虫腈降解产物由母体化合物在沉积物中持续产生，通过对颤蚓的生物测定估算沉积物中FSI的时间加权平均（TWA）浓度，以计算BSAF值（0.581 ± 0.211 g OC/g脂质）和BCF（3046 ± 1103或log 3.48 ± 0.16 mL/g）。这种方法能够在母体化合物持续降解的情况下估算沉积物中氟虫腈降解产物基于C的K值和BCF值。
