工作场所空气中邻联甲苯胺的气相色谱测定法

Method for determining o-tolidine in workplace air by gas chromatography

目的建立工作场所空气中邻联甲苯胺的气相色谱测定法。方法用玻璃纤维滤膜采集空气中的邻联甲苯胺，甲醇洗脱，气相色谱-氢火焰离子化检测器检测。结果在0．04-9．00μg／ml范围内呈线性关系，检出限为0．04μg／ml，最低检出浓度为0．0002mg／m^3（以采集375L空气样品计），采样效率为93％～100％，洗脱效率94％～96％，相对标准偏差为0．8％～2．5％，样品在4℃条件下至少能稳定保存8d，室温最多能保存6d。结论该方法各项指标均符合GBZ／T210．4—2008《职业卫生标准制定指南第4部分：工作场所空气中化学物质测定方法》，适用于工作场所空气中邻联甲苯胺的测定。

Objective To establish a method for determining o-tolidine in workplace air by gas chromatography. Methods o-tolidine in workplace air was collected with a glass fiber filter, desorbed with methanol, and determined by gas chromatography-flame ionization detector. Results The concentration of otolidine showed a linear relationship with peak area within 0.04-9.00μg/ml; the detection limit was 0.04 μg/ml; the minimum detectable concentration was 0.0002 mg/m3 （calculated by 375 L air sample）; the sampling efficiency was 93%-100%; the elution efficiency was 94%-96%; the relative standard deviation was 0.8-2.5%. Sample could be stored at 4 ℃ for at least 8 days and at room temperature for as long as 6 days. Conclusion This determination method meets the requirements of Guide for establishing occupational heath standards-Part 4 Determination methods of air chemicals in workplace （GBZ/T 210.4-2008） and is suitable for determination of o-tolidine in workplace air.