![]() ![]() The limit of detection, precision, and accuracy of the method are 0.006 μg/L, 2.6%–5.3%, and −3.5% to −2.0%, respectively. Combined with gas chromatography with mass spectrometry, the optimized method exhibits curve linearity in the range of 0.02–1.00 μg/L with an R 2 of 0.998. The optimization of extraction conditions (pH = 7, 35☌, and 20 min extraction duration) brought another 1.2 times further. The pattern how sodium sulfate enhanced ECH extraction by salting out is discussed. The effects of different mineral salts in SPME were studied and it was found that an addition of 3 g Na₂SO₄ in the SPME head achieved an additional 3.3-time increase. ![]() Specifically, the AC/PDMS/DVB fiber offered a 4.4-time enhancement comparing with the PDMS/DVB fiber. A total 17.4-time enhancement in extraction efficiency is achieved compared with the default condition. In this study, an improved headspace solid-phase microextraction (HS-SPME) procedure is developed and optimized to extract and enrich ECH with high sensitivity, accuracy, and precision. The accurate measurement of ECH at trace level (<0.1 μg/L) is still an obstacle hindering the monitoring and regulation of municipal water systems. Epichlorohydrin (ECH) is toxic to humans via multiple routes and is a potential carcinogen. ![]()
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