A method for detecting mustard gas degradation products thiodiglycol (TDG) and thiodiglycol sulfoxide (TDGO) in water and sediment samples using gas chromatography-tandem mass spectrometry (GC-MS/MS) after derivatization with 1-(trifluoroacetyl)imidazole (TFAI) was described. Selected reaction monitoring mode (SRM) of tandem mass spectrometry was developed for analysis of TDG and TDGO derivatives while analysis by gas chromatography-atomic emission detector (GC-AED) was performed using the 181 nm sulfur canal. TFAI derivatization conditions were optimized and the method validated. Two derivatization agents were compared, TFAI and N,O-bis(trimethylsilyl) trifluoroacetamide (BSTFA), where derivatization using TFAI occurred quicker and under milder conditions than using BSTFA. Water samples containing TDG and TDGO were evaporated to dryness under nitrogen, dissolved in organic solvent followed by reaction with TFAI. The limit of detection (LOD) for TDG and TDGO were 0.01 and 5 ng/mL, respectively. The limit of detection for TDG was decreased by two orders of magnitude if TFAI is used for derivatization rather than silyl derivatizing agents (e.g., BSTFA). TFAI has three major advantages in comparison to BSTFA, the first is much higher sensitvity, the second is a very clean background of chromatograms, and the last one is very mild conditions of derivatization. Moreover, by-products are not formed during derivatization of TDGO by TFAI in comparison to derivatization by silylating agents.
介绍了一种利用 1-(三
氟乙酰基)
咪唑 (T
FAI) 衍生后的气相色谱-
串联质谱 (GC-MS/MS) 检测
水和沉积物样品中
芥子气降解产物
硫代
二甘醇 (TDG) 和
硫代
二甘醇亚砜 (TDGO) 的方法。开发了用于分析 TDG 和 TDGO 衍
生物的
串联质谱选择反应监测模式(SRM),而气相色谱-原子发射检测器(GC-
AED)则使用 181 nm 的
硫管进行分析。对 T
FAI 衍生条件进行了优化,并对方法进行了验证。比较了两种衍生剂,即 T
FAI 和 N,O-双(三
甲基硅基)三
氟乙
酰胺(
BSTFA),使用 T
FAI 衍生比使用
BSTFA 衍生更快,条件更温和。含有 TDG 和 TDGO 的
水样在
氮气下蒸发至干,溶解在有机溶剂中,然后与 T
FAI 反应。TDG 和 TDGO 的检测限(LOD)分别为 0.01 和 5 纳克/毫升。如果使用 T
FAI 而不是
硅烷衍生剂(如
BSTFA)进行衍生,TDG 的检测限会降低两个数量级。与
BSTFA 相比,T
FAI 有三大优势:首先是灵敏度更高,其次是色谱背景非常干净,最后是衍生条件非常温和。此外,与使用
硅烷化剂进行衍生相比,使用 T
FAI 对 TDGO 进行衍生时不会产生副产品。