工作场所空气中的甲基丙烯酸溶剂解吸气相色谱测定法

为建立工作场所空气中甲基丙烯酸浓度的检测方法，用硅胶管采集工作场所空气中的甲基丙烯酸，用丙酮解吸后进样，经毛细管色谱柱分离，FID检测器检测，以保留时间定性，峰高或峰面积定量。实验发现，硅胶管采样效率为100%，丙酮解吸效率为9292%，方法的加标回收率为893%-980%。样品在低温下可保存至少7天。甲基丙烯酸在0-80880μg/ml浓度范围内线性关系良好，相关系数09995，方法的检出限为074μg/ml。采样45L，最低检出浓度为016mg/m3。研究表明，该方法操作简便，采样效率、准确度、精密度、解吸效率及样品稳定性均满足职业卫生标准制定指南要求，适用于工作场所空气中甲基丙烯酸浓度的测定。

Determination of methacrylic acid in workplace air with gas chromatography by solvent desorption

A kind of method using Gas-chromatography to measure the methacrylic acid concentration in the workplace air was researched .The methacrylic acid in the air was collected by silicone tube , and the samples was injected after desorption with acetone , separated with capillary-column, detected by FID detector so as to retain time property and peak height or peak area ratio .Sampling air with 0.5L/min for 15min, sampling efficiency of silicone tube was 100%, the acetone was stripping liquid , and the desorption efficiency was 92.92%.The sample could be stored in low temperature at least 7 days.There was a good linearity （r=0.9995） over the methacrylic acid concentration of 0-808.80μg/ml, the detection limit could reach 0.74μg/ml, and the minimum detectable concentra-tion was 0.16mg/m^3（sampling volume 4.5L ）.This method was proved to be accurate and sensitive ,to meet the determination of methacrylic acid in the workplace air .