Purdue University , Department of Agronomy, Ecological Science and Engineering Interdisciplinary Graduate Program, West Lafayette, Indiana 47907-2054, United States.
Environ Sci Technol. 2017 Dec 5;51(23):13698-13704. doi: 10.1021/acs.est.7b03889. Epub 2017 Nov 16.
Pressures to ban bisphenol A (BPA) has led to the use of alternate chemicals such as BPA analogues bisphenol S (BPS) and bisphenol AF (BPAF) in production of consumer products; however, information on their environmental fate is scarce. In this study, aerobic degradation of BPA, BPAF, and BPS at 100 μg/kg soil and 22 ± 2 °C was monitored for up to 180 days in a forest soil and an organic farm soil. At each sampling point, soils were extracted three times and analyzed by liquid chromatography high resolution mass or time-of-flight mass spectrometry. Based on compound mass recovered from soils compared to the mass applied, BPS had short half-lives of <1 day in both soils similar to BPA. BPAF was much more persistent with observed half-lives of 32.6 and 24.5 days in forest and farm soils, respectively. To our knowledge, this is the first report on BPAF degradation. For all three compounds, half-lives were longer in the higher organic carbon (OC) forest soil which correlates well to sorption studies showing higher sorption with higher OC. Metabolites identified for all three bisphenols support degradation pathways that include meta-cleavage as well as ortho-cleavage, which has not been previously shown.
由于禁止双酚 A（BPA）的压力，导致在生产消费品时使用了 BPA 类似物双酚 S（BPS）和双酚 AF（BPAF）等替代化学品；然而，关于它们的环境命运的信息却很少。在这项研究中，在森林土壤和有机农田土壤中，以 100μg/kg 土壤和 22±2°C 的温度监测了 BPA、BPAF 和 BPS 的好氧降解情况，最长可达 180 天。在每个采样点，土壤被提取三次，并通过液相色谱高分辨率质谱或飞行时间质谱进行分析。与施加的质量相比，从土壤中回收的化合物质量表明，BPS 在两种土壤中的半衰期均<1 天，类似于 BPA。BPAF 的持久性要高得多，在森林土壤和农田土壤中的半衰期分别为 32.6 和 24.5 天。据我们所知，这是首次报道 BPAF 的降解。对于所有三种化合物，半衰期在有机碳（OC）含量较高的森林土壤中较长，这与吸附研究结果很好地相关，表明 OC 越高，吸附性越强。对所有三种双酚类化合物都鉴定出了代谢物，支持降解途径，包括间位裂解和邻位裂解，这以前没有显示过。
