改进气相色谱法测定总烃与非甲烷总烃.pdf

化工
保
662
ENVIRONMENTAL PROTECTION OF CHEMCALINDUSTRY
2015年第35卷第6期
改进气相色谱法测定总烃与非甲烷总烃
王兴华,田英,任敏红,关丹
中国石油新疆油田分公同实验检测研究院,新疆克拉玛依834000
「摘要]」采用十通阀、双定量环进样(进样量0.5mL),专用的甲烷柱和总烃柱分别分离两路气样,单FID检测器
检测的方法测定环境空气和固定污染源废气中的总烃和非甲烷总烃(NMHC)。实验结果表明:总烃与甲烷工作
曲线的相关系数分别为0.9977和0.9990总烃与甲烷测定结果的相对标准偏差均未超过1.5%;总烃与NMHC的
检出限均为O.04mglm2;总烃的加标回收率为90.3%~113.0%,NMHC的加标回收率为91.1%~-1100%。上述指标
均满足HJ604-2011和HJ/T38-1999中对总烃及NMHC的测定要求。用注射器采样后的气样应尽量避光保存
放置时间宜在8h之内。该方法无需制备除烃空气,大幅提升了检测效率。
关键词]气相色谱;总烃;非甲烷总烃;除烃空气
[中图分类号]X831[文献标志码]A[文章编号]1006-1878(2015)06-0662-05
Determination of Total Hydrocarbons and Non-methane Hydrocarbons by
Improved Gas Chromatography
Wang Xinghua, lian Ying, Ren Minhong, Guan Dan
Experimental Detection Research Institute, Xin ang Oilfield Branch Company, Petrochina, Karamay Xinjang 834000, China)
Abstract; The oal hydrocarbons and non-methane total hydrocarbons (NMHC)in samples of ambient air and waste
gas from fixed pollution source were determined simultaneously by gas chromatography, using a ten-way valve with
2 quantitative rings(5 ml of sample volume for injection, 2 special capillary columns for respective analysis of
methane and total hydrocarbons and a single FID for detection. The experimental results show that: The correlation
coefficients of working curves for total hydrocarbons and methane are 0.997 7 and 0.9990 respectively; The relative
standard derivations are both less than ]. 5%; The detection limits of total hydrocarbons and NMHC are both 0.04
mg/m; The recoveries of total hydrocarbons and NHMC are 90.3%0-113.0% and 91.1%0-110.0% respectively All
these indexes meet the detecting request of national standard H 604-2011 and HJ/T38-1999. The gas sample with
jector should be stored in darkness within 8 h. Total hydrocarbons and NMHC can be detected by this method without
preparation of hydrocarbon-free gas, so the detecting efficiency is increased greatly
Key words: gas chromatography; total hydrocarbons; non-methane total hydrocarbons; hydrocarbon-free gas
固定污染源有组织排放和无组织排放的总烃有害外,在一定条件下经日光照射还会产生光化学
是指在标准规定的条件下,用FD检测器所测得的烟雾,从而对环境和人类造成危害。
气态碳氢化合物及其衍生物的总量:非甲烷总
监测环境空气和工业废气中NMHC的方法有
烃(NMHC)是指除甲烷以外的碳氢化合物(主要为许多,但目前大多数采用气相色谱法出。采用气
C2~C3)的总称。总烃中的甲烷气体对人体健康相色谱法测定总烃或NMHC的标准方法中都存在制
的危害暂未有明确结论,但甲烷在大气中的含量约
为1.4mg/m2),虽远低于二氧化碳的含量,但湿『收稿日期1205-07-16『修订日期12015-03-21
室效应的26%由甲烷引起,其作用是二氧化碳的
作者简介]王兴华(1986-),男,河北省邢台市人,硕士,T
22倍。NMHC超过一定浓度时,除直接对人体健康程师、电话090-6867895,电邮 wangxh xj(petrochina. com.cn