土壤中64种痕量半挥发性有机污染物的分析方法研究

利用超声提取技术将土壤中的半挥发性有机污染物(SVOC)提取出来, 经旋转蒸发浓缩至一定体积后, 用ODSC18柱净化, 再用氮吹浓缩后, 取1.0 μL注入气相色谱中, 用DB-5 ms柱分离, 用气相色谱质谱仪(GC-MS)进行定性定量分析. 本方法研究土壤中64种半挥发性有机污染物, 其中包括苯系物、苯酚类、苯胺类、硝基芳香烃类、氯代芳烃类、多环芳烃类和酞酸酯类等物质的提取、净化方法以及回收率、精密度和检测限的测定. 该方法回收率为52.5%～105%.

Determination of 64 trace semivolatile organic compounds in soil by gas chromatography/mass spectrometry (GC/MS)

A method for the determination of 64 semivolatile organic compounds(SVOCs) which include phenols,nitrobenzenes,phthalate esters,polynuclear aromatic hydrocarbons(PAHs) in soil by gas chromatography/mass spectrometry(GC/MS) was established.The organic compound analytes were first extracted from soil by CH_2Cl_2 with ultrasonic instrument.After part of the solvent being evaporated,the extract was cleaned up by octadecylsilica(C_(18)) column.Then the cleaned extract was concentrated further by nitrogen flow.At last the sample compounds were separated,identified,and measured by injecting an aliquot of the concentrated extract into DB-5ms capillary(column) of a GC/MS system.The mean recoveries of 64 SVOCs by spiking ranged from 52.5% to 105%.The RSDs were from 0.91% to 14.5%.The method detection limits(MDLs) were from 0.002 to 0.17 mg/kg.