广电计量检测(湖南)有限公司,湖南 长沙 410000
蒋建军,工程师,研究方向:生态环境有机污染物分析,E-mail:jiangjj@grgtest.com
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蒋建军,卢光磊,刘丽等.微波萃取-SPE柱净化/气相色谱-质谱法测定固体废物中53种半挥发性有机物[J].分析测试学报,2023,42(04):464-472.
JIANG Jian-jun,LU Guang-lei,LIU Li,et al.Determination of 53 Semi-volatile Organic Compounds in Solid Waste by Gas Chromatography-Mass Spectrometry with Microwave Extraction and Solid Phase Extraction Column Purification[J].Journal of Instrumental Analysis,2023,42(04):464-472.
蒋建军,卢光磊,刘丽等.微波萃取-SPE柱净化/气相色谱-质谱法测定固体废物中53种半挥发性有机物[J].分析测试学报,2023,42(04):464-472. DOI: 10.19969/j.fxcsxb.22111002.
JIANG Jian-jun,LU Guang-lei,LIU Li,et al.Determination of 53 Semi-volatile Organic Compounds in Solid Waste by Gas Chromatography-Mass Spectrometry with Microwave Extraction and Solid Phase Extraction Column Purification[J].Journal of Instrumental Analysis,2023,42(04):464-472. DOI: 10.19969/j.fxcsxb.22111002.
采用微波辅助萃取技术,结合固相萃取(SPE)小柱净化,建立了固体废物中53种半挥发性有机物的气相色谱-质谱检测方法。通过优化前处理条件,选择以丙酮-正己烷(1∶1,体积比)为萃取剂,微波萃取温度为100 ℃,萃取时间为15 min,萃取液经硅酸镁固相萃取柱净化,DB-5MS(30 m × 0.25 µm × 0.25 mm)色谱柱分离,结合电子轰击电离源(EI)选择离子监测(SIM)模式,采用内标法进行定量检测。实验表明:53种半挥发性有机物在0.2 ~ 5.0 mg/L范围内线性良好,相关系数(,r,)均不小于0.998,对典型固体废物灰渣和生化污泥样品的检出限分别为0.002 ~ 0.015 mg/kg和0.004 ~ 0.027 mg/kg,定量下限分别为0.008 ~ 0.060 mg/kg和0.016 ~ 0.108 mg/kg。在0.5、1.0、2.0 mg/kg 3个加标水平下,灰渣样品的平均加标回收率为70.7% ~ 98.5%,相对标准偏差(RSD,,n ,= 6)为1.7% ~ 14%;生化污泥样品的平均加标回收率为71.8% ~ 105%,RSD(,n ,= 6)为1.2% ~ 15%。该方法快速准确、环保可靠、试剂用量少、检测效率高,可满足固体废物中53种半挥发性有机物的高通量检测要求。
A gas chromatography-mass spectrometry(GC-MS) was established for the determination of 53 semi-volatile organic compounds in solid wastes,based on microwave-assisted extraction combined with solid phase extraction(SPE) column cleanup.Extraction was carried out in a microwave extraction tank using 20 mL acetone-hexane (1∶1,by volume) as the extractant,with an extraction temperature of 100 ℃ and an extraction time of 15 min,then the extract was concentrated by nitrogen blowing.The analyte was purified by magnesium silicate solid phase extraction column and separated on a DB-5MS(30 m × 0.25 µm × 0.25 mm) capillary column,finally detected with electron bombardment ionization source(EI) in selected ion monitoring(SIM) mode and quantified by internal standard method.The results showed that there were good linear relationships for 53 semi-volatile organic compounds in the range of 0.2-5.0 mg/L,with their correlation coefficients(,r,) not less than 0.998.The limits of detection for typical solid waste ash and biochemical sludge samples were in the range of 0.002-0.015 mg/kg and 0.004-0.027 mg/kg,while the limits of quantitation were in the range of 0.008-0.060 mg/kg and 0.016-0.108 mg/kg,respectively.For two typical solid waste negative sample matrices,the average recoveries at three spiked levels of 0.5,1.0 and 2.0 mg/kg for ash sample ranged from 70.7% to 98.5%,with relative standard deviations(RSDs,,n ,= 6) of 1.7%-14%,while the average recoveries for biochemical sludge sample ranged from 71.8% to 105%,with RSDs(,n ,= 6) of 1.2%-15%.The method was applied to the analysis of solid waste samples from Miluo pesticide plant,in which seven semi-volatile organic compounds,i.e.phorate,fenitrothion,heptachlor,hexachlorobenzene,,p,,,p,'-DDE,,p,,,p,'-DDT and mirex with different concentrations were detected.This method is rapid,accurate,environmentally friendly and reliable,and low reagent consumption,which could meet the requirements for high throughput detection of 53 semi-volatile organic compounds in solid waste,and significantly improve the detection efficiency for semi-volatile organic compounds.
半挥发性有机物固体废物微波萃取固相萃取气相色谱-质谱联用
semi-volatile organic compoundssolid wastemicrowave extractionsolid phase extractiongas chromatography-mass spectrometry
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