内标法与外标法测定废气中挥发性有机化合物
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摘要
目前采用热脱附-气相色谱-质谱法测定废气中挥发性有机化合物时多使用外标法。实验对比了内标法与外标法测定时存在的差异,发现大多数VOCs内标法的回收率均高于外标法,且内标法的相对标准偏差普遍小于外标法,内标法测定的准确度和精密度均优于外标法。内标法的标准曲线可使用更长时间,对于大量样品的测定非常有利;而外标法必须每次测定时重新绘制新曲线。故废气中VOCs测定工作推荐使用内标法定量。
At present,the external standard method(ESTD)is mostly used to determine volatile organic compounds(VOCs)in waste gas by thermal desorption-gas chromatography-mass spectrometry. The difference between the internal standard method(ISTD)and ESTD were compared by experiment. It is found that the most recovery rate of VOCs via ISTD is higher than that via ESTD,the relative standard deviation of ISTD is generally smaller than that of ESTD,and the accuracy and precision of ISTD are better than that of ESTD. The standard curve of ISTD can be used for a longer period of time,which is very beneficial for determination of a large number of samples;whereas that of ESTD must be redrew for each time. Therefore,ISTD is recommended for quantified determination of VOCs in waste gas.
At present,the external standard method(ESTD)is mostly used to determine volatile organic compounds(VOCs)in waste gas by thermal desorption-gas chromatography-mass spectrometry. The difference between the internal standard method(ISTD)and ESTD were compared by experiment. It is found that the most recovery rate of VOCs via ISTD is higher than that via ESTD,the relative standard deviation of ISTD is generally smaller than that of ESTD,and the accuracy and precision of ISTD are better than that of ESTD. The standard curve of ISTD can be used for a longer period of time,which is very beneficial for determination of a large number of samples;whereas that of ESTD must be redrew for each time. Therefore,ISTD is recommended for quantified determination of VOCs in waste gas.
引文
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[2]朱卫东,顾潮春,谢兆明,等.工业固定污染源连续排放在线监测技术[J].石油化工自动化,2016,52(5):1-6,21.
[3]王红丽,景盛翱,王倩,等.溶剂使用源有组织排放VOCs监测方法及组成特征[J].环境科学研究,2016,29(10):1433-1439.
[4]上海市浦东新区环境监测站,中国环境监测总站.固定污染源废气挥发性有机物的测定固相吸附-热脱附/气相色谱-质谱法:HJ 734-2014[S].北京:中国环境科学出版社,2015.
[5]冯丽丽,胡晓芳,于晓娟,等.热脱附-气相色谱-三重四级杆串联质谱法测定环境空气中的挥发性有机物[J].色谱,2016,34(2):209-214.
[6]王丽琴,蒋京鑫,柯桢.气相色谱-质谱联用仪测定电子产品中多溴联苯和多溴联苯醚[J].分析仪器,2009,2:21-24.
[7]US Environmental Protection Agency.Determination of volatile organic compounds in ambient air using active sampling onto sorbent tubes,compendium method TO-17[S].US,Washington D C:USEPA,1999.
[8]胡圆园,扈正权,童益,等.影响气相色谱-质谱法测定六六六和滴滴涕标准样品准确度的因素[J].环境卫生学杂志,2016,6(3):242-245.
[9]谢月亮,凌萍,潘城,等.皮革中富马酸二甲酯残留量的GC-MS内标法测定[J].广东化工,2011,38(6):201-202,191.
[10]陈小萍,林国斌,金玉玲,等.不同分析技术测定调味品中3-氯-1,2-丙二醇的应用研究[J].中国卫生检验杂志,2005,15(3):287-288,329.