摘要
目的建立测定工作场所空气中三氯甲烷的热脱附-气相色谱联用检测方法。方法工作场所空气中的三氯甲烷用Air Toxics吸附管采样,用Pekin Elmer Tubo Matrix ATD-650热脱附仪脱附后进样,经毛细管色谱柱分离,氢火焰离子化检测器检测,以保留时间定性,峰面积定量。方法研究按照《工作场所空气中化学物质测定方法》的要求进行实验室实验及模拟现场实验。结果该方法在0～300μl范围内呈线性关系,峰面积与含量的回归方程为Y=16.6 X+2.8;r=1.000;检出限为0.88μg,当采样体积为4.5 L时最低检出浓度为0.20 mg/m3;方法的重现性较好,不同浓度的相对标准偏差为3.14%～6,15%,解吸效率为103.0%～83.7%,采样效率为100%。样品在Air Toxics吸附管中可稳定保存3 d。结论该方法简便快速,灵敏度高,适用于工作场所空气中三氯甲烷的监测。
[Objective]To establish a method for determination of trichloromethane in workplace air by thermal desorption-gas chromatography.[Methods]The trichloromethane samples were collected from workplace air by Air Toxics adsorption tube,injection was conducted after desorption with Pekin Elmer Tubo Matrix AFD 650 thermal desorption instrument,and detection was performed by flame ionization detector.The retention time was adopted in qualitative analysis,and peak area was applied in quantitative evaluation.The laboratory examination and simulate experiments were conducted according to the Determination methods of air chemicals in workplace.[Results]The standard curve was linear in the content ranges of 0-300 μl,and the regression equation was Y = 16.6 X ＋ 2.8,r = 1.000.The detection limit was 0.88 μg.The minimum detectable concentration was 0.20 mg/m3 while the sampling volume was 4.5 L.The repeatability was good,the relative standard deviation（RSD） was 3.14%-6.15%,the desorption efficiency was 103.0%-83.7%,and the sampling efficiency was 100%.The samples could be stably stored for 3 days in Air Toxics adsorption tube.[Conclusion]The method is simple and rapid,with high sensitivity,which is suitable for determination of trichloromethane in workplace air.
出处
《职业与健康》
CAS
2013年第11期1332-1334,共3页
Occupation and Health
关键词
三氯甲烷
热脱附
气相色谱
Trichloromethane
Thermal desorption
Gas chromatography
