| 摘要: |
| 为探究湘江上游永州段饮用水中全氟化合物(PFCs)的时空分布与污染特征以及沿程水厂中各工艺单元的PFCs变化趋势情况,选取两个市级饮用水水源水和水厂各工艺段水样作为研究对象,采用固相萃取-超高效液相色谱-电喷雾-串联质谱联用仪,测定水中17种PFCs的含量。结果表明,湘江永州段市级饮用水从水源水到龙头水中17种PFCs的检出率为100%,全氟羧酸类(PFCAs)浓度明显高于全氟磺酸类(PFSAs),全氟辛酸(PFOA)和全氟辛烷磺酸(PFOS)的浓度均远低于《生活饮用水卫生标准》(GB 5749-2022)中限值；曲河水源和诸葛庙(娘子岭水厂)水源中17种PFCs浓度的时间分布变化特征为枯水期>平水期>丰水期；空间分布变化特征为:下游的曲河水源水中全氟化合物的总浓度(150 ng/L)高于上游的诸葛庙(娘子岭水厂)水源水(120 ng/L)。自来水厂的常规工艺对较低浓度的全氟化合物的去除效率较低,曲河水厂17种PFCs的去除效率高于娘子岭水厂,其中全氟十二酸(PFDoA)去除效率最高达64.27%；龙头水中全氟丁酸(PFBA)和全氟戊酸(PFPeA)的浓度高于水源水。 |
| 关键词: 全氟化合物 水源水 龙头水 固相萃取-超高效液相色谱-电喷雾-串联质谱联用仪 |
| DOI： |
| 分类号:O657. 63 |
| 基金项目:2023年湖南省环保科研项目 |
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| Study on the spatiotemporal distribution and pollution characteristics of perfluorinated compounds in drinking water in the Yongzhou section of the upper reaches of the Xiangjiang River |
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| Abstract: |
| In order to explore the temporal and spatial distribution and pollution characteristics of perfluorinated compounds (PFCs) in drinking water in Yongzhou section of the upper reaches of the Xiangjiang River, as well as the change trend of PFCs in each process unit along the water plant, two municipal drinking water source water samples and water samples from each process section of the water plant were selected as research objects, and the content of 17 PFCs in water was determined by solid phase extraction coupled-HPLC-ESI- MS/MS. The results showed that the detection rate of 17 PFCs in the municipal drinking water from the source water to the tap water in the Yongzhou section of the Xiangjiang River was 100%, and the concentration of perfluorocarboxylic acids (PFCAs) was significantly higher than that of perfluorosulfonic acids (PFSAs) ,the concentrations of perfluorooctanoic acid (PFOA) and perfluorooctane sulfonate (PFOS) are both much lower than the limit values in the "Sanitary Standards for Drinking Water"(GB 5749-2022); the temporal distribution and variation characteristics of 17 PFCs concentrations in the Quhe water source and Zhuge Temple water source are as follows:dry season>normal season>abundant season; The spatial distribution variation characteristics are: the total concentration of perfluorinated compounds in the downstream Qu River water source (150 ng/L) is higher than that in the upstream Zhuge Temple water source(120 ng/L). The conventional process of water treatment plants has low removal efficiency for lower concentrations of per-fluorinated compounds. The removal efficiency of 17 PFCs in Quhe Water Plant is higher than that in Niangziling Water Plant, among which the removal efficiency of perfluorododecanoic acid (PFDoA) is as high as 64.27%; the concentrations of perfluorobutyric acid (PFBA) and perfluorovaleric acid (PFPeA) in tap water are higher than those in source water. |
| Key words: PFCs detecting Source water Tap water Solid phase extraction coupled-HPLC-ESI-MS/MS |
