液液萃取气质联用法检测水中IPMP与IBMP

Determination of IPMP and IBMP in Water with Liquidliquid Extraction by Gas Chromatographymass Spectrometry

摘要:

对液液萃取(LLE)气相色谱质谱(GC/MS)法测定饮用水中异嗅物质2甲氧基3异丙基吡嗪(2methoxy33isopropyl pyrazine,IPMP)及2甲氧基3异丁基吡嗪(2methoxy33isobutyl pyrazine,IBMP)的方法进行了探讨,确定了最佳萃取条件,萃取时间为4 min,NaCl加入量为60 g·L-1,pH值为4左右.在选定条件下,IPMP和IBMP在20～500 μg·L-1的范围内具有良好的线性关系,相关系数r>0.995;方法回收率为72.0%～103.6%;相对标准偏差RSD＜8%.

Abstract:

An analytical method used for the detection of odorants——2methoxy33isopropyl pyrazine (IPMP) and 2methoxy33isobutyl pyrazine (IBMP) in drinking water with liquidliquid extraction (LLE) by gas chromatographymass spectrometry(GC/MS)was developed.The LLE was carried out in a solution of pH 4 with a dosage of 0.2 and 60 g·L -1NaCl,respectively.The extraction lasted for 4 min.Good relativity (r>0.995 4) was obtained when the linear range was 20～500 μg·L -1.The recoveries of IPMP and IBMP were 72.0%～103.6%.The relative standard deviations were less than 8%.