聚氯乙烯车间空气中氯乙烯的顶空气相色谱测定法

Determination of Vinyl Chloride in Air of Polyvinyl Chloride Workshop by Headspace Gas Chromatography

用顶空气相色谱法测定聚氯乙烯车间空气中氯乙烯的含量。以流量为0．1L/min采集空气试样1．5L，经甲醇解吸后，顶空温度在50℃条件下平衡40min，用气相色谱FID检测器，以OV-1毛细管柱分离测定。氯乙烯的加标回收率为97．9％～111．2％，方法最低检出浓度为0．89mg／m^3，相对标准偏差（RSD％）为4．99％。结果表明，该方法有较高的灵敏度和理想的准确度，并能达到规定的检出限，适用于工作场所空气中氯乙烯的测定。

We determine the concentration of vinyl chloride in air of polyvinyl chloride workshop by Headspace Gas Chromatography. Acquire 1.5 L air sample by the flow rate of 0. 1 L/min, desorbing the sample by methanol, in equilibrium the solution for 40 min at the temperature of 50℃C. Determine the sample by gas chromatography with FID detector and OV-1 Capillary column. The recoveries of vinyl chloride are 97.9 % - 111.2 %. The lowest detection concentration is 0. 89 mg/m3. Relative standard deviation（ RSD % ） is 4.99 %. The results show that the meth- od has higher sensitivity and ideal accuracy which can reach the specified detection limit. It is suitable for the deter-mination of vinyl chloride in air of workplace.