School of Geography and Tourism, Qufu Normal University, Rizhao 276826, China.
School of Geography and Tourism, Qufu Normal University, Rizhao 276826, China.
Mar Pollut Bull. 2018 Nov;136:481-490. doi: 10.1016/j.marpolbul.2018.09.045. Epub 2018 Sep 28.
Precursors that can be transformed into perfluoroalkyl acids (PFAAs) have not been investigated in detail. In this study, the levels of potential PFAA precursors in the Jiaozhou Bay, inflowing rivers, and STP (sewage treatment plant) effluents were investigated by converting all PFAA precursors into perfluorinated carboxylic acids (PFCAs) by chemical oxidation. The significance of controlling PFAA precursors was indicated by the ratios of PFCAs converted by the oxidative treatment of precursors to PFAAs before oxidation (∑△[PFCA]/∑[PFAA]). The higher levels of △[PFCA] (average = 18.89 ng/L) and lower ratios (∑△[PFCA]/∑[PFAA], average = 0.21) were revealed in the STP effluents rather than in the water of the Jiaozhou Bay and rivers, which implied the precursors conversion during the sewage treatment process. The concentrations of △[PFCAs] and the aforementioned ratios showed apparent spatial and temporal differences. These results indicated that STPs were the important sources of precursors to other water bodies.
尚未详细研究可转化为全氟烷基酸 (PFAAs) 的前体物质。在本研究中，通过化学氧化将所有 PFAAs 前体物质转化为全氟羧酸 (PFCAs)，从而调查了胶州湾、入流河和 STP（污水处理厂）废水中潜在 PFAAs 前体物质的水平。氧化处理前前体物质转化为 PFCAs 与氧化前 PFAAs 的比值（∑△[PFCA]/∑[PFAA]）表明控制 PFAAs 前体物质的重要性。STP 废水中的△[PFCA]（平均值为 18.89ng/L）水平较高，比值（∑△[PFCA]/∑[PFAA]，平均值为 0.21）较低，而胶州湾和河流中的水则较低，这表明污水处理过程中存在前体物质转化。△[PFCAs]的浓度和上述比值表现出明显的时空差异。这些结果表明，STP 是其他水体前体物质的重要来源。
