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Determination of Typical Odorous Compounds in Water Using Purge-and-trap Gas Chromatography-Mass Spectrometry Combined with Stable Isotope Dilution
Author(s): 
Pages: 248-252
Year: Issue:  2
Journal: Chinese Journal of Analytical Chemistry

Keyword:  稳定性同位素稀释 吹扫捕集 气相色谱/质谱 臭味物质;
Abstract: 采用稳定性同位素稀释吹扫捕集-气相色谱/质谱联用法测定水中典型臭味物质土臭素(GSM)和2-甲基异莰醇(MIB)。研究了特征离子、升温程序、样品吹扫温度及盐浓度等因素对臭味物质萃取过程的影响。本实验测定臭味物质的最佳条件为:盐浓度20%(m/V),样品吹扫温度60℃,程序升温速率5℃/min。通过加入同位素内标d5-GSM和d3-MIB,可以提高样品回收率的稳定性。土臭素(GSM)和2-甲基异莰醇(MIB)浓度在5~500 ng/L范围内线性良好;在100 ng/L加标浓度水平下,GSM和MIB回收率范围分别为82%~95%和99%~101%;相对标准偏差为5.20%和0.78%。方法检出限分别为3.60和4.12 ng/L。本方法操作简单、快速、准确,用于实际水样的检测效果良好。
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