环境空气中的28种异味物质罐采样-气相色谱质谱法定量及半定量分析方法的建立

Establishment of quantitative and semi quantitative anylysis methods for tank sampling of 28 odor substances in ambient air at plant boundary by gas chromatography-mass spectrometry

本文建立了28种环境空气中异味物质采用罐采样-气相色谱质谱分析方法,该方法在1—20 nmol·mol^(−1)范围内线性良好,方法检出限为0.001—0.03 nmol·mol^(−1),方法性能指标满足精确定量要求.将28种异味物质和4种内标相关信息导入生成专用异味数据库,该数据库包含保留指数、气味阈值、气味描述、校准曲线等信息,可实现无标准品时对环境空气中异味物质进行半定量筛查.通过标准品和厂界环境空气实际样品进行验证,采用精确定量和数据库半定量,结果差异均在可接受范围.

28 kinds of odor substances in the ambient air at the boundary of the plant are collected by specially prepared canisters and analyzed by GCMS.The linearity of the method is good in the range of 1—20 nmol·mol^(−1),and the detection limit of the method is 0.001—0.03 nmol·mol^(−1).The performance indexes of the method meet the requirements of precise determination.Meanwhile,28 kinds of odor substances and 4 kinds of internal standard information are imported into and generated into a special odor database,which contains information such as retention index,odor threshold,odor description and calibration curve,which can realize semi quantitative screening of odor substances in the ambient air at the plant boundary when there is no standard.Through the verification of standard and actual samples respectively,the deviation between accurate quantitative and database semi quantitative results of all substances is within the acceptable range.