State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Environ Sci Technol. 2022 Jun 21;56(12):8103-8113. doi: 10.1021/acs.est.2c01287. Epub 2022 Jun 10.
Sodium -perfluorous nonenoxybenzenesulfonate (OBS), a novel alternative to perfluorooctane sulfonic acid (PFOS), has been widely used in various fields in China and has certain toxic effects similar to PFOS. This study monitored OBS and 15 legacy PFASs in surface water, sediment, soil, and crucian carp near a fluorochemical manufacturing factory (FMF) in Suqian, China, focusing on the emission, isomer-specific environmental fate, and transformation of OBS. One to four orders of magnitude higher concentrations of OBS than other polyfluoroalkyl substances (PFASs) in all samples indicate that industrial emission is an important point source of OBS in the surrounding environment. The concentrations of OBS in surface water, sediment, and soil decreased exponentially as the distance from the FMF increases. The proportions of OBS-c, the dominant isomer, increased in the order: water (75.5 ± 6.4%), sediment (85.7 ± 10%), fish (muscle: 94.1 ± 0.99%; blood: 93.5 ± 1.4%), suggesting its preferential accumulation in sediment and fish than other isomers. Mono-hydroxylated transformation products of OBS were first identified in water, sediment, and fish, suggesting its hydroxylation may exist in the real environment. The transformation of OBS may explain its significantly lower bioaccumulation than PFOS in fish. However, considering the higher BAF of OBS than the regulatory bioaccumulation criterion and the possible stronger toxicity of its transformation products, further studies on its bioaccumulation and transformation are warranted.
全氟辛烷磺酸（PFOS）的新型替代品——过氟壬基苯磺酸钠（OBS）在中国的各个领域得到了广泛的应用，并且具有与 PFOS 相似的一定毒性作用。本研究监测了中国宿迁市一家氟化工制造工厂（FMF）附近的地表水、沉积物、土壤和鲫鱼中 OBS 和 15 种传统全氟烷基物质（PFASs），重点关注 OBS 的排放、异构体特异性环境归宿和转化。在所有样品中，OBS 的浓度比其他多氟烷基物质（PFASs）高出 1 到 4 个数量级，这表明工业排放是周围环境中 OBS 的一个重要点源。随着与 FMF 距离的增加，地表水、沉积物和土壤中 OBS 的浓度呈指数级下降。OBS-c，即主要异构体的比例在以下顺序中增加：水（75.5±6.4%）、沉积物（85.7±10%）、鱼（肌肉：94.1±0.99%；血液：93.5±1.4%），表明其优先在沉积物和鱼中积累，而不是其他异构体。首次在水中、沉积物和鱼中鉴定出 OBS 的单羟基化转化产物，表明其在真实环境中可能存在羟化作用。OBS 的转化可以解释其在鱼体内的生物积累显著低于 PFOS。然而，考虑到 OBS 的 BAF 高于监管生物积累标准，以及其转化产物可能具有更强的毒性，有必要进一步研究其生物积累和转化。
