HS-GC-MS法测定彩泥中28种挥发性有机物

28 Volatile Organic Compounds in Colour Mud Determination by Headspace Gas Chromatography-mass Spectrometry

建立了顶空-气相色谱-质谱法测定彩泥中28种挥发性有机物(异丁烷、甲醇、丙酮、苯、二甲苯、乙酸乙酯等)的分析方法。分别讨论了顶空进样的平衡时间和平衡温度的影响,将彩泥样品经剪碎至0. 5 cm×0. 5 cm的颗粒,于110℃加热30 min后顶空进样,用质谱检测器(EI源)检测、外标法定量,可获得较好的定量结果。28种挥发性有机物在0. 2~10. 0μg含量范围内,线性关系良好,各物质相关系数r均大于0. 997 8,方法检出限范围为0. 1~0. 5 mg/kg,定量限范围为0. 3~1. 5 mg/kg;加标平均回收率在80. 5%~105. 1%之间,相对标准偏差(n=6)在2. 1%~9. 6%之间。方法前处理简单、快速、准确,适用于彩泥中28种挥发性有机物的快速检测。

A method was established for the determination of 28 volatile organic compounds(isobutane,methanol,acetone,benzene,dimethylbenzene and ethyl acetate,etc.)in colour mud by headspace gas chromatography-mass spectrometer(HS-GC-MS).The balance time and the balance temperature of headspace injection were investigated.VOCs were conducted by mass spectrometry detector(EI source),and the contents were calculated by the external standard method.The VOCs were well quantitatively analyzed while the headspace equilibrium temperature at 110℃for 30 min with the sample diameter 0.5 cm×0.5 cm.The calibration curves were linear in the range of 0.2~10.0μg with the correlation coefficients of each substance more than 0.9978.The limits of detection(LODs)were 0.1~0.5 mg/kg,the limits of quantitation(LOQs)were 0.3~1.5 mg/kg.The average recovery rate ranged from 80.5%to 105.1%,and the relative standard deviation(n=6)were 2.1%~9.6%.The method is suitable for the determination of 28 VOCs in colour mud rapidly and accurately.