摘要
水质中56种挥发性有机物(VOCs)同时检测时,由于被分析物的物理、化学性质差异较大,导致它们在顶空-气相色谱/质谱法检测系统中的灵敏度和精密度参差不齐,测定方法检出限时难于严格按照HJ 168—2010进行。综合分析6个VOCs加标质量浓度水平的统计结果,把方法检出限的筛选分为6类,分类目的是使得到的样品结果均值与对应的计算方法检出限比值接近4,且较小的计算方法检出限作为最终的被分析物方法检出限(0.09~2.4μg/L);总量的方法检出限参照异构体的筛选方法,得到1,2-二氯乙烯、二甲苯、三氯苯的总量方法检出限分别为2.4、0.33、3.9μg/L。方法检出限筛选方法可供同行参考。
The detection of method limit of analysts is difficult to follow HJ 168—2010 strictly,as the sensitivities and precisions of 56 kinds of volatile organic compounds(VOCs)in environmental water samples detected with headspace-gas chromatography/mass spectrometry were uneven due to the large differences in physical and chemical properties of the analysts.Comprehensive analysis of the statistical results of blank samples spiked with six concentration levels of VOCs,the screening of detection limits were divided into six categories,and the classification purpose was that the ratio of mean values of sample results and calculation method detection limits were close to four,and the smaller calculation method detection limits were used as the final method detection limit(0.09~2.4μg/L).The screening method of method detection limits of total amount were based on the isomers screening method,and the method detection limits of 1,2-dichloroethylene,xylene and trichlorobenzene were 2.4,0.33,and 3.9μg/L,respectively.Screening method of method detection limit discussed here is more practical and can be promoted.
作者
赖永忠
黄意敏
LAI Yong-zhong;HUANG Yi-min(Institute of Marine Sciences,Shantou University,Shantou 515063,China;Shantou Environmental Monitoring Station,Shantou 515063,China;The Third Internal Medicine Department of Cancer Hospital of Medical College,Shantou University,Shantou 515041,China;Guangdong Provincial Key Laboratory of Marine Biotechnology,Shantou University,Shantou 515041,China)
出处
《化学试剂》
CAS
北大核心
2020年第8期948-953,共6页
Chemical Reagents
关键词
挥发性有机物
方法检出限
总量
顶空
气相色谱/质谱法
水质
volatile organic compounds
method detection limit
total
headspace
gas chromatography/mass spectrometry
environmental water
