自來水中的黴味 (Mold Odor)
日本自來水的飲用品質備受推崇,但近年來黴味逐漸成為問題,這種黴味已知是由 2-二甲基冰片 (2–methylisoborneol) 及 diosmin 所造成。
這些化合物的氣味閾值約為 10 ppt,無法透過氣相層析質譜儀 (GC/MS) 直接檢測,如同飲用水的檢測方法一節所述,在 GC/MS 量測之前,必須使用吹掃捕集法進行濃縮。
參考文獻
(1) Drinking Water Test Method & Explanation; edited by Japan Water Works Association
(2) Environmental Water Quality Analysis Manual; edited by Japan Society for Environmental Chemistry
Gas Chromatograph Mass Spectrometer
This instrument is widely used for the qualitative and quantitative analysis of chemical substances. The column and ionization method are selected to suit the analysis target components. The purge & trap method concentrates a sample by 100x to 1000x. Unknown components are easily identified using mass spectra of the peaks in the total ion chromatogram (TIC). 本儀器廣泛用於化學物質的定性和定量分析。選擇管柱和離子化方法以因應分析目標組成成分。 Purge & Trap方法將樣品濃縮100倍至1000倍。使用總離子層析圖(TIC)中峰的質譜可以很容易地識別未知成分。