O-I化学激光器工作场所空气中Cl2和I2的同时测定

提出了同时测定化学氧碘(O-I)激光器工作场所空气中氯气(Cl2)和碘蒸气(I2)浓度的方法。以Na2SO3溶液作为吸收液,两级吸收管串联法测定吸收液的吸收效率,采用大气采样器与多孔玻板吸收管同时采集空气中的Cl2和I2蒸气,离子色谱测量吸收液中Cl-和I-的浓度。当采样流量为1.0L/min,以10mL吸收液采集15L气体时,吸收液对Cl2和I2的吸收效率分别为99.4%±0.3%和99.7%±0.1%,对应检出限分别为0.019mg/m3和0.030mg/m3;P=0.95时的扩展相对不确定度分别为8.2%和6.3%。化学O-I激光器工作场所5个监测点中,Cl2的最高浓度为0.200mg/m3,I2的浓度低于本方法检出限,Cl2和I2的浓度均低于工作场所空气中的最高容许浓度值(1mg/m3),为评估Cl2和I2对作业人员健康的影响提供了重要依据。本方法操作简便,检测快速,干扰少,可用于环境空气与工作场所空气中Cl2和I2浓度的同时测定。

Simultaneous determination of chlorine and iodine in the air from oxygen-iodine chemical lasers

Chlorine and iodine in the air from oxygen-iodine chemical lasers have been determined simultaneously.Sodium sulfite solution is used as absorption solution.Sampling efficiency is determined by a series two-stage absorption tubes.Chlorine and iodine are simultaneously collected by air sampler with multi-hole absorbing tubes.The concentrations of Cl-and I-in the absorption solution are detected by ion chromatography.When 15 L air is collected using 10 mL absorption solution at a flow rate of 1.0 L/min,the sampling efficiencies are 99.4%±0.3% and 99.7%±0.1% for chlorine and iodine,respectively,and the detection limits are 0.019 mg/m3 and 0.030 mg/m3.The expanded uncertainties are 8.2% and 6.3% when P=0.95.In the five monitoring sites of experiment place,the highest concentration of chlorine is 0.200 mg/m3.The concentration of iodine is lower than its detection limit,but both of the chlorine and iodine concentrations are lower than their maximal acceptable concentrations(1 mg/m3) in the air of workplace,and these data provide an important evidence for estimating the harm to staff.This method is with simple operation,fast detection and little interference,and also could be used to determine the chlorine and iodine in the air of ambience and workplace.