| 摘要: |
| 采用Tenax GR吸附-热脱附-气质联用法对固定污染源废气中50种挥发性有机物（VOCs）进行测定。结果显示，Tanax GR吸附管对于丙酮、环戊酮、2-庚酮、2-壬酮及六甲基二硅氧烷的吸附能力相对较差，但丙酮、环戊酮、2-庚酮、2-壬酮在2~30 ng范围内呈现良好的线性关系，且相关系数（R2）＞0.99，六甲基二硅氧烷在2~50 ng范围内呈现良好的线性关系，R2=0.994，其他45种化合物在2~100 ng范围内呈现良好的线性关系，R2＞0.995。当采样体积为300 mL时，50种化合物的检出限为0.000 3~0.009 6 mg/m3，测定下限为0.001 1~0.038 4 mg/m3，相对标准偏差（RSD）＜15.98%，加标回收率为78.15%~120.90%。该方法操作简单、灵敏度高、准确性好，能够满足固定污染源废气中痕量VOCs的快速检测。 |
| 关键词: Tenax GR吸附 挥发性有机物 热脱附 气相色谱-质谱 |
| DOI： |
| 分类号:X831;O657.7+1 |
| 文献标识码:B |
| 基金项目: |
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| Determination of 50 Volatile Organic Compounds in Stationary Source Emission |
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CHEN Hai-xiu，LI Jun，LI Guan-hua
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Jiangsu Kangda Testing Technology Co. Ltd.，Suzhou,Jiangsu 215000,China
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| Abstract: |
| The determination of 50 volatile organic compounds in stationary source emission was carried out by Tenax GR thermal desorption-gas chromatography mass spectrometry method.The experimental results indicated that Tenax GR tubes has lower adsorption capacity for acetone, cyclopentanone,2 heptanone,2 nonone and hexamethyldisiloxane than other 45 VOCs,but the concertration of acetone,cyclopentanone,2 heptanone and 2 nonone was linearly in the range of 2~30 ng and the coefficionts efficiency were above 0.99,the concertration of hexamethyldisiloxane was linearly in the range of 2~50 ng and the coefficionts efficiency was 0.994, the concertration of other 45 VOCs was linearly in the range of 2~100 ng and the coefficionts efficiency were above 0.995. When the sampling volume was 0.3 L, the detection limit of 50 VOCs was between 0.000 3~0.009 6 mg/m3and the quantitation limit was between 0.001 1~0.038 4 mg/m3,the relative standard deviations(RSD) was below 15.98% and the recoveries were between 78.15%~120.90%. The method is simple,sensitive and accurate for the detection of trace VOCs in stationary source emission. |
| Key words: Tenax GR adsorption VOCs Thermal desorption Gas chromatography mass spectrometry |
