摘要
建立了气相色谱-质谱(GC-MS)测定水中痕量四乙基铅的分析方法。用正己烷萃取水样中的四乙基铅,萃取液浓缩后加入同位素内标萘-d8,采用GC-MS选择离子方式(SIM)进行检测,在200mL水样中四乙基铅的检出限可达0.04μg/L;添加回收率为92.2%～103%,准确度好;平行5次测定的相对标准差为4.4%～13.3%。结果表明:方法简便、快速、准确、实用,可用于水中痕量四乙基铅的测定。
A new method for the determination of tetraethyllead （TEL） in water by gas chromatography-mass spectrometry （GC-MS） has been developed. The TEL in water samples （200 mL） was extracted with hexane （50 mL） by adding 20 g NaCl,then the extracted solution was concentrated into 1.0 mL and the internal standard （naphthalene-d8） solution was added to every concentrated solution. The pretreated samples were analyzed by GC-MS. An amount of 1.0 μL solution was injected onto an HP-5ms capillary column （30 m×0.25 mm×0.25 μm） and determined by GC-MS in selected ion monitoring （SIM）. The selected monitoring ions were m/z 136,236,237,294 and 295. The m/z 295 was selected as quantitative ion for TEL and m/z 136 for the internal standard. The method had good linearity over the tested concentration range of 0.02-0.40 mg/L （r=0.9998） for TEL. The analytical performance characteristics of the proposed procedure were as follows：the detection limit for TEL in 200 mL water sample was 0.04 μg/L. The average recoveries and the relative standard deviations of TEL were 92.2%-103% and less than 13.3%,respectively. The method is rapid,convenient and accurate for the determination of water samples.
出处
《色谱》
CAS
CSCD
北大核心
2010年第10期993-996,共4页
Chinese Journal of Chromatography
关键词
气相色谱-质谱法
四乙基铅
水
gas chromatography-mass spectrometry （GC-MS）
tetraethyllead
water
