掺入铁颗粒的全氟辛酸 (PFOA) 促进饮用水条件下消毒副产物的形成,Environmental Science & Technology

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掺入铁颗粒的全氟辛酸 (PFOA) 促进饮用水条件下消毒副产物的形成
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2023-03-14 , DOI: 10.1021/acs.est.2c09372
Yuan Zhuang ₁ , Donghan Li ₁ , Baoyou Shi _{1,

2}

Affiliation

全氟辛酸 (PFOA) 是一种新兴的持久性有机污染物，在整个饮用水供应系统中经常被检测到。在这里，我们首先发现 PFOA 会在配送过程中显着增加无衬里铁管 (UIP) 中消毒副产物 (DBP) 的形成。增加的 DBP 不是由于 PFOA 本身与游离氯的反应，而是原位形成的 Fe-PFOA 复合物起到了关键作用。值得注意的是，PFOA 可以增强 UIP 中的铁释放，并大量结合到铁颗粒中形成 Fe-PFOA 复合物。Fe-PFOA 非均相反应产生的•OH 可以将大的溶解有机物分解成与氯具有更高反应活性的小分子。此外，具有更多芳香结构的 DBP 前体有利于与 Fe-PFOA 复合物形成强 Fe-π 相互作用，从而导致更多的•OH 形成芳香 DBP。细胞毒性试验表明，暴露于含有 100 ng/L PFOA 的 UIPs DBPs 的细胞存活率为 46.9%，而没有 PFOA 的细胞存活率为 67.91%。总的来说，这项研究为 PFOA 的风险提供了一个新的视角，重点不是 PFOA 本身，而是它在铁基饮用水分配管道中促进 DBP 相关毒性的潜力。

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Perfluorooctanoic Acid (PFOA) Incorporated into Iron Particles Promoted the Formation of Disinfection Byproducts under Drinking Water Conditions

Perfluorooctanoic acid (PFOA) is an emerging persistent organic pollutant that is frequently detected throughout the drinking water supply system. Here, we first found that PFOA could significantly increase the formation of disinfection byproducts (DBPs) in unlined iron pipes (UIPs) during the distribution process. The increased DBPs were not due to the reaction of PFOA itself with free chlorine, but the in situ formed Fe–PFOA complex played a key role. Notably, PFOA could enhance iron release from UIPs and was greatly incorporated into the iron particles to form Fe–PFOA complex. The •OH generated by the Fe–PFOA heterogeneous reaction could break large dissolved organic matter into small molecules that had higher reactivity with chlorine. In addition, DBP precursors with more aromatic structures were favorable for forming strong Fe−π interactions with Fe–PFOA complex, resulting in more •OH for the formation of aromatic DBPs. The cytotoxicity test showed that the viability of cells exposed to DBPs from UIPs with 100 ng/L PFOA was 46.9%, while that without PFOA was 67.91%. Overall, this study provided a new perspective on the risk of PFOA, with a focus not on PFOA itself but on its potential to promote DBP-associated toxicity in iron-based drinking water distribution pipes.

更新日期：2023-03-14

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