中文关键词
全氟化合物(PFASs)前体物浓度污染贡献乐安河 | 英文关键词perfluoroalkyl substances (PFASs)precursorsconcentrationpollution contributionLean River |
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| 中文摘要 |
| 全氟化合物（perfluoroalkyl substances，PFASs）前体物的转化及其对污染的贡献成为PFASs污染研究的热点问题.基于羟基自由基氧化、固相萃取和高效液相色谱-质谱串联（UPLC-MS/MS）相结合的方法对乐安河河流水体及其附近污水厂出水中15种PFASs及其3种前体物的浓度与前体物的转化进行了研究.结果表明，乐安河河流水体与污水厂出水18种被测物质的总浓度分别为14.89~40.84 ng·L-1和58.63~114.87 ng·L-1，均值分别为28.76 ng·L-1和86.75 ng·L-1；两种水体中含量最高的污染物均为全氟辛烷磺酸（perfluorooctanesulfonic acid，PFOS）；乐安河上下游水体中PFASs的含量具有明显的空间差异.经过羟基自由基氧化处理后，两种水体中PFASs的浓度均出现明显的升高；碳原子数为4~8的短链全氟羧酸类物质浓度增幅（ΣΔ［PFCAC4~C8］氧化转化）明显高于碳原子数为9~12的长链物质；而且，氧化处理导致污水厂出水样品PFASs浓度升高更明显；但污水厂出水中前体物的转化率（ΔPFCA氧化转化/PFCA氧化前）却低于乐安河水体，此结果说明前体物在污水处理过程中可能产生降解. |
| 英文摘要 |
| Transformation of perfluoroalkyl substance (PFASs) precursors and their contribution to PFASs pollution have become a subject of great research interest. The concentration of PFASs and their precursors and the transformation of precursors in the water samples collected from Le'an River and the effluents of sewage treatment plants (STPs) were investigated based on methods including hydroxyl radical (·OH) oxidation, extraction by solid phase, and ultra-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS). The results of the study revealed that the PFAS concentrations were in the range of 14.89-40.84 ng·L-1and 58.63-114.87 ng·L-1, and averaged 28.76 ng·L-1 and 86.75 ng·L-1 in the water of the Le'an River and the STP effluents, respectively. The compound with the highest concentration for the two kinds of waterbodies was perfluorooctanesulfonic acid (PFOS). The PFAS concentrations showed obvious spatial differences in the water of the Le'an River. After the oxidation treatment, the PFAS concentrations clearly increased in the two kinds of waterbodies. The increased concentrations of short-chain perfluorocarboxylic acids with carbon atom numbers of 4-8 (ΣΔ［PFCAC4-C8］oxidation conversion) were higher than those of compounds with long carbon chains. However, the increased concentrations of PFCAs for the STP effluents were higher than those for the river water. The transformation ratio obtained from the increased concentration of PFCAs led by the oxidation treatment against the PFCA concentration before oxidation (ΔPFCAoxidation conversion/PFCAbefore oxidation) was lower for the STP effluents than those for the water of Le'an River, which might be induced by the precursors' degradation during the sewage treatment process. |
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