工作场所空气中吡啶的混合溶剂解吸气相色谱测定法

目的建立混合溶剂解吸气相色谱法测定工作场所空气中吡啶的方法。方法工作场所空气中吡啶用碱性活性炭管采集,混合溶剂10%（体积分数）甲醇二氯甲烷溶液]解吸后进样,经FFAP石英毛细管柱分离,氢焰离子化检测器检测。结果用混合溶剂代替二氯甲烷作解吸溶液,吡啶解吸效率由49.4%提高至82.0%。吡啶浓度在0～60μg/ml范围内线性关系良好,线性方程为：Y=4.31＋8.24 X（r=0.999 9）。检出限为0.07μg/ml,若采集1.5 L空气样品,则最低检出浓度为0.05 mg/m^3,平均加标回收率为98.3%～102.2%,平均解吸效率在81.1%～81.9%,相对标准偏差在0.9%～2.5%。结论该方法适用于工作场所空气中吡啶浓度的测定。

Determination of pyridine in workplace air by gas chromatography with the mixed solvent desorption

Objective]To establish a method for determination of pyridine in workplace air by gas chromatography with the mixed solvent desorption. Methods]Pyridine in the air was collected by alkaline activated charcoal tube. The mixed solvent（ 10%（ volume fraction） methanol in dichloromethane） was desorbed,then separated by FFAP capillary column,and detected by hydrogen flame ionization detector. Results]The desorption efficiency increased from 49. 4% to 82. 0% when using the mixed solvent instead of dichloromethane. Good linear relationship was observed with pyridine concentration between 0-60 μg / ml,the linear regression equation was y = 4. 31 ＋ 8. 24 X（ r = 0. 999 9）. The detection limit was 0. 07μg / ml. The minimum detectable concentration was 0. 05 mg / m^3（ 1. 5 L air sample）,the average recoveries were 98. 3%-102. 2%. The average desorption efficiency were81. 1%-81. 9%. The relative standard deviations were 0. 9%-2. 5%. Conclusion]The method is suitable for determination of pyridine in workplace air.