Water Cycle Research Center, Korea Institute of Science and Technology, Seoul, South Korea.
Ecological Science and Engineering Interdisciplinary Graduate Program, Department of Agronomy, Purdue University, West Lafayette, IN, USA.
Environ Sci Pollut Res Int. 2020 Apr;27(12):13976-13984. doi: 10.1007/s11356-020-07803-7. Epub 2020 Feb 8.
Permanganate (PM) has shown to be able to oxidize a range of organic contaminants including perfluorooctane sulfonate (PFOS). However, mechanisms of PFOS removal by PM have been questioned. To provide clarity to what may be happening to PFOS in PM systems, here we evaluated the ability of PM on PFOS destruction by conducting studies similar to previous studies that reported PFOS destruction which included PM solutions and PM combined with persulfate (PS). We also evaluated if addition of various soluble catalysts could enhance PM's potential to breakdown PFOS. We observed no PFOS destruction by PM. We also show that the F and SO generation reported in a published study as evidence that PM was breaking bonds in PFOS were found below or not significantly higher than reported limits of quantitation and that SO impurities in technical PM approach the reported SO levels. For PM-PS systems, heterogeneous PFOS distribution was observed when subsampling reaction vessels at different depths and "salting-out" of PFOS was evident. In addition, subsequent sonication and filtering of the samples led to the apparent disappearance of most of the PFOS, which was an artifact arising from the behavior of PFOS aggregates or potential hemi-micelle formation. Given these findings, addition of salts may have application for collecting or concentrating PFOS and other PFAAs in a remediation or water treatment strategy.
高锰酸盐（PM）已被证明能够氧化包括全氟辛烷磺酸（PFOS）在内的一系列有机污染物。然而，PM 去除 PFOS 的机制一直存在争议。为了澄清 PM 系统中 PFOS 的可能变化情况，我们通过开展类似于先前报道 PFOS 破坏的研究来评估 PM 对 PFOS 破坏的能力，这些研究包括 PM 溶液和 PM 与过硫酸盐（PS）的结合。我们还评估了添加各种可溶性催化剂是否可以增强 PM 破坏 PFOS 的潜力。我们观察到 PM 没有破坏 PFOS。我们还表明，在一项已发表的研究中，作为 PM 破坏 PFOS 键的证据而报告的 F 和 SO 的生成，其含量低于或明显低于报告的定量限，并且技术 PM 中的 SO 杂质接近报告的 SO 水平。对于 PM-PS 系统，当在不同深度的反应容器中进行亚采样时，观察到异相 PFOS 分布，并且“盐析”PFOS 是明显的。此外，对样品进行后续的超声处理和过滤导致大部分 PFOS 明显消失，这是由于 PFOS 聚集体或潜在的半胶束形成的行为而产生的假象。鉴于这些发现，添加盐可能适用于在修复或水处理策略中收集或浓缩 PFOS 和其他 PFAAs。
