顶空-气相色谱法同时测定水源水中8种苯系物  

Simultaneous determination of 8 benzene series in source water by headspace-gas chromatography

作　　者：刘帮宇 徐浩 唐鸿琴 LIU Bangyu;XU Hao;TANG Hongqin(Upper Changjiang River Bureau of Hydrological and Water Resources Survey,Bureau of Hydrology,Changjiang Water Resources Commission,Chongqing 400025,China)

机构地区：[1]长江水利委员会水文局,长江上游水文水资源勘测局,重庆400025

出　　处：《化学分析计量》2024年第7期42-46,共5页Chemical Analysis And Meterage

摘　　要：基于顶空-气相色谱技术建立水源水中8种苯系物含量的检测方法。对顶空加热平衡温度及色谱条件进行优化,样品经60℃平衡30 min,选择DB-WAX型毛细管柱(30 m×250 mm,0.25μm)为分离柱,分流比为10∶1,氢火焰离子化检测器测定。结果表明,8种苯系物的质量浓度在50~2000μg/L范围内与色谱峰面积线性关系良好,相关系数为0.9996~0.9998,方法检出限为0.14~0.24μg/L。样品加标回收率为90.5%~100%,测定结果的相对标准偏差为1.39%~1.51%(n=7),标准物质测定均值的相对偏差为0.10%~2.25%(n=7)。该方法准确度高、操作简便、重现性好、检出限满足相关标准要求,可用于水源水中8种苯系物的同时检测。A detection method for the content of eight benzene series compounds in source water was established based on headspace-gas chromatography.The headspace heating equilibrium temperature and chromatographic conditions were optimized.The sample was equilibrated at 60℃for 30 minutes,and a DB-WAX capillary column(30 m×250 mm,0.25μm)was selected as the separation column with a split ratio of 10:1.The detection was performed using a hydrogen flame ionization detector.The results showed that the mass concentration of the eight benzene series compounds had a good linear relationship with the chromatographic peak area in the range of 50-2000μg/L,with correlation coefficients between 0.9996-0.9998.The method detection limits ranged from 0.14 to 0.24μg/L.The spiked recovery rates of the samples were between 90.5%-100%,and the relative standard deviations of the measurement results were between 1.39%-1.51%(n=7).The relative deviation of the mean value of the standard substance was 0.10%-2.25%(n=7).This method is highly accurate,simple to operate,has good reproducibility,and the detection limits meet relevant standards,making it suitable for the simultaneous detection of eight benzene series compounds in source water.

关 键 词：顶空-气相色谱法 苯系物 水源水 同时测定 

分 类 号：O657.7[理学—分析化学]