摘要
建立了海水中苯、甲苯、乙苯、对二甲苯、间二甲苯、邻二甲苯以及苯乙烯7种苯系物的测定方法。采用吹扫捕集法对海水中的苯系物进行富集,热解吸后导入气相色谱-质谱仪,并选用选择离子模式(SIM)进行检测。结果表明:在100.0～2 000.0 ng/L范围内7种苯系物浓度与仪器响应值的线性关系良好,相关系数为0.999 6～0.999 8,方法检出限为5.9～10.7 ng/L;两种不同浓度加标水平(250.0、1000.0 ng/L)的平均回收率分别为84%～105%和96%～97%,相对标准偏差(n=6)分别为3.7%～6.5%和2.1%～3.3%。该方法准确、快速,且具有富集效率高、无试剂再污染等优点,适用于海水中痕量苯系物的分析测定。
A method was developed for the determinations of seven BTEX（the term used for a group of volatile aromatic compounds）,including benzene,toluene,ethylbenzene,p-xylene,m-xylene,o-xylene and styrene,in seawater by purge and trap gas chromatography-mass spectrometry under selective ion monitoring （SIM） mode.The result showed that the calibration curves of seven BTEX were in the range of 100.0-2 000.0 ng/L,with correlation coefficients of 0.999 6-0.999 8.The method detection limits ranged from 5.9 ng/L to 10.7 ng/L.The average recoveries for seven BTEX at two spiked concentration levels of 250.0 ng/L and 1 000.0 ng/L were in the range of 84%-105% and 96%-97%,with relative standard deviations（RSDs,n=6） of 3.7%-6.5% and 2.1%-3.3%,respectively.This method is accurate and rapid,and has high enrichment efficiency without any organic contamination,which can be used to analyze seawater samples containing trace BTEX.
出处
《分析测试学报》
CAS
CSCD
北大核心
2012年第12期1531-1535,共5页
Journal of Instrumental Analysis
基金
国家海洋公益性行业专项(201205012-7)
关键词
苯系物
吹扫捕集
气相色谱质谱联用
BTEX
purge and trap
gas chromatography-mass spectrometry
