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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/m3,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。
Objective To establish a method for the determination of pyridine in the air by mixed solvent desorption gas chromatography. Methods The air in the workplace was collected on a basic activated charcoal tube. The mixed solvent [10% (volume fraction) methanol in methylene chloride] was desorbed and injected into a FFAP quartz capillary column for detection by hydrogen flame ionization detector. As a result, the efficiency of pyridine desorption increased from 49.4% to 82.0% using a mixed solvent instead of dichloromethane as the desorption solution. The linearity of pyridine concentration ranged from 0 to 60 μg / ml. The linear equation was: Y = 4.31 + 8.24 X (r = 0.999 9). The detection limit was 0.07μg / ml. If 1.5L air sample was collected, the minimum detectable concentration was 0.05 mg / m3. The average recovery was 98.3% ~ 102.2% and the average desorption efficiency was 81.1% ~ 81.9% The standard deviation of 0.9% to 2.5%. Conclusion This method is suitable for the determination of pyridine concentration in the air of workplace.