固体废物半挥发性有机物的测定

Determination of Semi Volatile Organic Compounds in Solid Waste

采用加压溶剂萃取气相色谱-质谱法测定固体废物中64种半挥发性有机物的含量。用二氯甲烷-丙酮(1+1)混合液进行萃取,所得萃取物用弗罗里硅土固相萃取小柱净化,用气相色谱分离、质谱检测,内标法定量。64种半挥发性有机物在一定质量浓度内与其峰面积成线性,方法检出限为0.02 mg/kg^0.11 mg/kg、测定下限为0.08 mg/kg^0.44 mg/kg。以灰渣样品为基质进行加标回收实验,其相对偏差(n=6)为0.7%~20.4%,所得回收率在44%~129%之间。

The content of 64 kinds of semi volatile organic compounds in solid waste was determined by gas chromatography-mass spectrometry with pressurized solvent extraction.Extraction was performed with a dichloromethane-acetone(1+1)mixed solution,and the obtained extract was purified using a Florisil silica solid-phase extraction cartridge,separated by gas chromatography,detected by mass spectrometry,and quantified by an internal standard method.The 64 semi-volatile organic compounds are linear with their peak areas within a certain mass concentration.The detection limit of the method was 0.02 mg/kg^0.11 mg/kg,and the lower limit of determination was 0.08 mg/kg^0.44 mg/kg.The ash and slag sample was used as the matrix for the standard recovery experiment.The relative deviation(n=6)was 0.7%~20.4%,and the recovery rate was between 44%~129%.