顶空气相色谱法测定污水中的苯系物.pdf

石油化
444
PETROCHEMICAL, TECHNOLOGY
201!年第40卷第4期
分析测试
顶空气相色谱法测定污水中的苯系物
朱春丽,梁宁',侯晓红,张聪路',王洪明',江树志2
(1.沈阳药科大学制药工程学院,辽宁沈阳110016;2.沈阳振兴环保产业集团有限公司,辽宁沈阳10141
摘要」采川顶空气相色法测定了污水中的苯系物,该苯系物包括苯、甲苯、乙苯、对二甲苯、间二甲苯、邻二甲苯、异内苯和苯乙
烯。采用气相色譜-FID、AC-20弹性石英毛细管色谱柱,对气相色谱分析条件和顶空分析条件(水样体积、平衡温度、平衡时
间、聚四氟乙烯膜及加盐量)进行了优化,使得各组分得到完全分离。实验结果表明,苯系物各组分在质量浓度6-I000μg/L内
均与峰面积呈良好的线性关系,相关系数大于0.99:最佳顶空分析条件为:试样用量8mL、平衡温度60C、平衡时间20min、氯
化钠用量2.0g、使用聚四氟乙烯膜隔离水样和密封佳橡胶垫。在最分析条件下,该方法的检出限为1.1~1.3以g/L,相对标准偏
差为1.3%~5.2%(n=6),加标回收率为85.3%~103.6%(n=3)。该方法快速、准确,可监测污水处理进、出水中苯系物的含量
关键词」顶空气相色谱;污水;苯系物;测定
文章编号]100-8144(2011)04-0444-06
中图分类号」TQ209
文献标识码]A
Determination of Benzene Series in Sewage water by Headspace Gas Chromatography
Zhu Chunli Lian Ning How ahong hang Congl, Wang Hongming iang Shuhi
( 1. School of Pharmaceutical Engineering, Shenyang Pharmaceutical University, Shenyang Iiaoning 110016, Chi
2. Shenyang henxing Enviromental ] rotection Industry Group Co, Ltd, Shenyang Liaoning 110141, Chim/
Abstract. An analytical method for determination of the benzene series in sewage water by headspace
gas chromatography was studied. The main objects of the analysis were benzene, toluene, ethylbenzene
p-xylene, m-xylene, o-xylene, cumene and styrene. The influences of sample volume, equilibration
time, equilibration temperature, polytetrafluoroethylene isolating film and sample salinity on the
determination were investigated. The benzene series were completely separated on an AC-20 capillary
column (30 m x 0. 32 mm 0.5 um and determined by GC equipped with FID. The experimental
results indicated good linear correlations of the working curves of the benzene series and the linearity
ranges were in 6-1 000 ug/L. The linear regression coefficients were more than 0.999. The optimal
conditions for the headspace gas chromatographic analysis were sample volume 8 ML, equilibration
temperature 60 C, equilibrating time 20 min, Naci dosage 2.0 g and using polytetrafluoroethylene
isolating film. Under the optimal conditions, the detection limits were in a range of 1.1-1.3 /Land
the relative standard deviations were in 1.3%-5.2%(n was 6). The recoveries werc853-1036%
(n was 3). Determination of the benzene series in influent and effluent of the sewage plant by the
method indicated that benzene series were disposed completely by the sewage treatment process
I Keywords] headspace gas chromatography; sewage water; benzene series; determination
水中挥发性苯系物主要来源于工业废水,包括水中苯系物前处理的方法有液一液萃取法34、固
苯、甲萃、乙苯、对二甲苯、间二甲苯、邻二甲苯、异相微萃取法3-?、顶空、吹扫捕集法-9、吹扫捕
内苯和苯乙烯8种化合物。苯是目前公认的强致癌
物质,其他几种苯系物对人体也均有不同程度的收稿日期!200-11-03:修改稿日期]201-01-0
作者简介」朱春丽(1984一),女,河南省商丘市人,硕士生,电话
毒性2,因此测定水中苯系物的含量对环境保护具15040324邮xcH5670126.com。联系人:梁宁,电话24
有重要意义。但由于这些物质在水中的含量较低,23986458,电邮robinln2002@hotmail.com
水样必须经过前处理将其富集后才能检测。用于基金项目]沈阳市科技局大型仪器享资助项目(090100