液相色谱法测定水中16种多环芳烃的方法优化_王超

第33卷2014年第1期1月

环境化学

ENVIRONMENTALCHEMISTRY

Vol.33,No.1January2014

DOI:10.7524/j.issn.0254-6108.2014.01.016

*

16液相色谱法测定水中种多环芳烃的方法优化

王超

1**

彭涛

2

吕怡兵

1

滕恩江

1

(1.中国环境监测总站,北京,100012;2.扬州市环境监测中心站,扬州,225007)

摘要溶剂置换条件和萃取液浓缩方式等对水中16种PAHs的液液萃取-液相色谱方法进行从色谱条件、

了优化研究.结果显示,超高压液相色谱的分析时间(20min)和消耗的有机溶剂(6.6mL)分别为高效液相色谱的59%和18%,其标准曲线的线性关系、仪器的精密度和灵敏度也优于高效液相色谱,但对部分PAHs不能h,i)苝荧光信号的显著增强,实现基线分离.二氯甲烷会引起苯并(a)芘和苯并(g,加入5mL乙腈可使溶剂中的二氯甲烷置换充足,避免荧光信号的异常.氮吹过程中,剩余体积需保持在0.2mL以上,以减少2—3环PAHs的损失.对于大体积萃取液的浓缩方式,旋转蒸发法可减少2—3环PAHs的损失,使16种PAHs的平均回收率(99.6%)高于氮吹法(77.6%).两种加标水平的实验结果显示16种PAHs的回收率为84.2%—108.5%(RSD2.2%—7.3%).优化后的方法稳定可靠,可为广大环境监测及科研人员准确分析水中16种PAHs提供参考.关键词

多环芳烃,液相色谱,液液萃取,优化.

Optimizationofliquidchromatographymethodfordetectionof

16polycyclicaromatichydrocarbonsinenvironmentalwater

WANGChao1*

PENGTao2

LYUYibing1

TENGEnjiang1

(1.ChinaNationalEnvironmentalMonitoringCentre,Beijing,100012,China;2.YangzhouEnvironmentalMonitoringCentre,Yangzhou,225007,China)

Abstract:Toquantify16polycyclicaromatichydrocarbonsinenvironmentalwater,wedevelopeda

liquid-liquidextraction/liquidchromatography(LC)methodbyoptimizingchromatographiccondition,solvent-displacementcondition,extract-concentrationmeans.Comparedwithhigh

thedevelopedultrahigh-pressureliquidchromatographyperformanceliquidchromatography(HPLC),

(UPLC)methodhasreducedanalysistimeandlessconsumptionoforganicsolvent(lessthanonefifth),andbetterlinearcorrelationcoefficient,precisionandlimitofdetection(LOD).However,severalPAHscouldnotbeseparatedbybaselineinUPLCprobablyduetothelimitationoftheusedstationaryphase.Wealsoobservedthatmethylenechloridecouldincreasethefluorescentintensityofbenzo(a)pyreneandbenzo(ghi)perylene.Tomaintainthefluorescencesignal,5mLacetonitrilewasusedtodisplacemethylenechlorideinsolvent.Toensurehighrecoveryoflow-ringPAHs,the

residualvolumeofthesampleextractshouldbeleftabove0.2mLafternitrogenblowing.Tofurtherconcentrationofbulkofextract,rotaryevaporationwasusedtoreducethelossof2—3ringsPAHs.Recoveriesof16PAHsareintherangeof84.2%—108.5%(RSD2.2%—7.3%)fortwospikedlevels.Theoptimizedmethodisrugged,reliableandusefulforaccuratedeterminationof16PAHsinenvironmentalwater.

Keywords:polycyclicaromatichydrocarbons,liquidchromatography,liquid-liquidextraction,

optimization.

2013年4月20日收稿.

*863计划(2013AA06A308)资助.

mail:preparing@126.com**通讯联系人,Tel:010-84943198;E-

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