吹扫捕集-三重四级杆气质联用测定生活饮用水中9种含氮消毒副产物  

Determination of 9 Nitrogen-Containing DBPs in Drinking Water by Purge and Trap-Gas Chromatography-Triple Quadrupole Mass Spectrometry

作　　者：王杰 甘晓娟 贾海舰 WANG Jie;GAN Xiaojuan;JIA Haijian(Chongqing Water Group Water Quality Testing Co.,Ltd.,Chongqing 400060,China)

机构地区：[1]重庆水务集团水质检测有限公司,重庆400060

出　　处：《净水技术》2024年第5期198-203,共6页Water Purification Technology

摘　　要：建立吹扫捕集-三重四级气质联用测定饮用水中6种卤乙腈、3种卤代硝基甲烷消毒副产物(DBPs)的方法,并了解本市饮用水中目标DBPs的浓度水平。优化吹扫捕集条件,气质联用条件建立检测方法,并对日常饮用水、原水样品进行检测,选用10#捕集阱(2,6-二苯基对苯醚/硅胶/碳分子筛),选用DB-VRX色谱柱,对比25 mL吹扫管与5 mL吹扫管前处理灵敏度,确定吹脱时间为11 min,捕集阱温度为40℃,捕集阱热脱附温度为190℃,传输线温度为115℃,烘烤时间为10 min,吹扫流量为40 mL/min。在多反应监测(SRM)模式下检测,外标法定量。结果表明,各个物质线性范围良好,r>0.996,方法检出限(LODs)为0.051~0.14μg/L,定量限为0.25~0.56μg/L,两种不同浓度加标回收率为70.2%~117.0%,相对标准偏差为2.45%~10.50%。该方法高效、灵敏、操作简单,对卤乙腈、卤代硝基甲烷等DBPs能进行有效检测。对出厂水、管网水进行检测,不同消毒工艺次氯酸钠、液氯和二氧化氯消毒时,卤乙腈检出质量浓度不同,为ND~3.20μg/L,卤代硝基甲烷未检出。To establish a method for the determination of six haloacetonitriles and three halogenated nitromethane disinfection byproducts(DBPs)in drinking water by purge and trap triple four stage GC/MS,and to understand the concentration level of target DBPs in drinking water in this city.Optimize the purge and capture conditions,establish a detection method using gas chromatographymass spectrometry,and detect daily drinking water and raw water samples.Select a 10#trap(2,6-diphenyl phenyl ether/silica gel/carbon molecular sieve)and a DB-VRX chromatographic column.Compare the pre-treatment sensitivity of a 25 mL purge tube with a 5 mL purge tube.Determine a purge time of 11 minutes,a trap temperature of 40℃,a trap thermal desorption temperature of 190℃,and a transfer line temperature of 115℃,The baking time is 10 minutes,and the blowing flow rate is 40 mL/min.Detected in SRM mode.Quantitative analysis using external standard method.The results showed that the linear range of each substance was good,with r>0.996.The detection limit of the method(LODs)was 0.051~0.14μg/L,and the quantitative limit was 0.25~0.56μg/L.The recovery rates of the two different concentrations were 70.2%~117.0%,and the relative standard deviation was 2.45%~10.50%.This method is efficient,sensitive and simple to operate,and can effectively detect DBPs such as halogen acetonitrile and halonitromethane.The factory water and pipe network water are tested.In different disinfection processes of sodium hypochlorite,liquid chlorine and chlorine dioxide,the mass concentration of halogen acetonitrile is different,ND~3.20μg/L,and haloated nitromethane is not detected.

关 键 词：卤代硝基甲烷 卤乙腈 吹扫捕集-三重四级杆气质联用 饮用水 含氮消毒副产物 

分 类 号：TU991[建筑科学—市政工程]