An improved method for determining HNMs in drinking water
An improved method for determining HNMs in drinking water
复制标题
DOI：
10.2166/ws.2013.135
复制
发表时间：
2013-09
期刊：
影响因子：
--
通讯作者：
Fangqu Huang;Mengyong Ruan;J. Yan;H. Hong;Hongjun Lin;Yujing Xiong
中科院分区：
文献类型：
--
作者：
Fangqu Huang;Mengyong Ruan;J. Yan;H. Hong;Hongjun Lin;Yujing Xiong
饮用水中的卤代硝基甲烷 (HNM) 由于其高健康风险而日益受到公众关注，因此开发灵敏的分析方法已成为当务之急。目前 HNM 的研究主要采用液-液萃取 (LLE) 方法。但灵敏度远非理想。本研究旨在探讨LLE法分析HNM时可能影响提取效率的因素，从而开发一种更灵敏的HNM测定提取方法。结果表明，硫酸钠的剂量影响最显着，其次是硫酸铜，而pH值和手动摇动次数影响不大。在合适的条件下（45 mL水中提取HNM：pH = 3.5–5，CuSO 4 = 1.0 g，Na 2 SO 4 = 6 g，振荡次数= 120–180），9种HNM的校准曲线的相关系数（ r ）均大于0.9925。方法检出限（MDL）范围为0.017至0.217 μg L -1 ，平均值为0.076 μg L -1 ，明显低于报道的方法。回收率（加标空白样品：98-108%；加标自来水：81-120%）和精密度（相对标准偏差：0.46-6.72）也显示出该方法良好的可靠性和重现性。最后，将所开发的方法应用于实际水样中HNMs的测定。
Halonitromethanes (HNMs) in drinking water are increasingly becoming a public concern due to their high health risks, so development of a sensitive method for their analysis has become a priority. Liquid–liquid extraction (LLE) method is dominantly used in current studies regarding HNMs. However the sensitivity is far from ideal. The present study aims to investigate the factors that may influence the extraction efficiency during HNM analysis by LLE method, and as a result develop a more sensitive extraction method for HNM determination. Results showed that the dose of sodium sulfate exerted the most significant influence, followed by copper sulfate, while the pH and manual shaking times have little effect. Under the suitable conditions (for extracting HNMs in 45 mL water: pH = 3.5–5, CuSO 4 = 1.0 g, Na 2 SO 4 = 6 g, shaking times = 120–180), the correlation coefficients ( r ) of the calibration curves for nine HNMs were all more than 0.9925. The method detection limit (MDL) ranged from 0.017 to 0.217 μg L −1 with an average of 0.076 μg L −1 , which was dominantly lower than the method reported. The recovery (spiked blank samples: 98–108%; spiked tap water: 81–120%) and precision (relative standard deviation: 0.46–6.72) also showed good reliability and reproducibility of the method. Finally, the developed method was applied to the determination of HNMs in real water samples.