| 自来水处理工艺对溶解相中全氟化合物残留的影响 |
| 摘要点击 3683 全文点击 1809 投稿时间：2012-12-13 修订日期：2013-01-21 |
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| 中文关键词 全氟化合物 全氟辛烷磺酸 全氟辛酸 自来水处理工艺 原水 出厂水 高效液相色谱-质谱 |
| 英文关键词 perfluorinated compounds (PFCs) perfluorooctane sulfonate (PFOS) perfluorooctanoic acid (PFOA) tap water treatment process raw water finished water high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) |
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| 中文摘要 |
| 为探究自来水原水到出厂水各处理环节对自来水中全氟化合物(perfluorinated compounds, PFCs)残留的影响,了解原水中PFCs的季节性变化规律,应用WAX固相萃取分离富集与高效液相色谱-质谱联用相结合的方法,分析了深圳市某自来水厂一年间原水、出厂水及絮凝池、沉降池、砂滤池、臭氧+活性炭池出水溶解相中13种PFCs的残留水平. 结果表明,原水和出厂水中∑PFCs残留呈春夏高而秋冬低的趋势,检出的PFCs呈中短链(C≤10)≥长链(C≥11)的分布,而全氟辛烷磺酸是PFCs最典型残留种态. 在原水经过的5个处理环节中,臭氧+活性炭、沉降和砂滤具有PFCs去除效应,然而絮凝和液氯消毒却分别使短链(C≤6)和中链(10≥C≥7) PFCs显著上升,导致出厂水中∑PFCs浓度较原水增加了10%~44%. 但出厂水中PFCs残留远低于其限值,尚不足以影响人体健康. |
| 英文摘要 |
| To study the perfluorinated compounds (PFCs) residues through water treatments including flocculation, sedimentation, sand filtration, ozonation with activated carbon and chlorination, as well as the seasonal variation of PFCs in the raw water of waterworks, 13 PFCs species in the dissolved phase of raw water, finished water, as well as the water samples after flocculation, sedimentation, sand filtration, and ozonation with activated carbon filtration were measured by the high performance liquid chromatography-tandem mass spectrometry combined with solid phase extraction. Results indicated that ∑PFCs residue in water was higher in spring and summer than that in fall and winter. The vast majority of PFCs in samples were of short and medium chains (C≤10), and perfluorooctane sulfonate was the most typical residue species. Among the five water treatment stages, sedimentation, sand filtration and ozonation with activated carbon filtration can remove PFCs, while flocculation and chlorination significantly raise the levels of short- (C≤6) and medium-chain (10≥C≥7) PFCs, respectively, causing ∑PFCs increase in finished water by 10%-44% compared to raw water. However, the PFCs residues in finished water are still far below their limit values, posing no threat against human health. |
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