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目的验证工作场所空气中金属加工液(MWF)浓度的测定方法。方法用37 mm和40 mm的聚四氟乙烯滤膜分别采集工作场所空气中的矿物油类、水溶性、合成、半合成等4种类型的金属加工液,滤膜进行第1次称量,然后经过溶剂洗脱、干燥后进行第2次称量,根据滤膜2次称量的减重计算工作场所空气中的金属加工液浓度。结果本方法可以测定矿物油类、水溶性、合成、半合成等4种类型的金属加工液浓度。该方法的最低检出浓度为0.06 mg/m~3(以采集960 L空气样品计),精密度RSD为3.1%~5.5%,样品的回收率为95.2%~99.4%,检出限为0.06 mg~0.08 mg,采样效率为96.2%~98.9%,洗脱效率为95.2%~99.2%。结论该方法的各项验证指标均符合GBZ/T 210.4—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》的要求,可适用于工作场所空气中金属加工液浓度的检测。
Objective To verify the determination of the concentration of metalworking fluid (MWF) in the workplace air. Methods Four types of metalworking fluids were collected from the air in the air of the workplace using polytetrafluoroethylene (PTFE) membranes of 37 mm and 40 mm, respectively. Then eluted by solvent, dried and weighed for the second time, and the concentration of the metalworking fluid in the workplace air is calculated according to the weight loss of the filter 2 times. Results The method can determine the concentrations of mineral oil, water-soluble, synthetic, semi-synthetic and other four types of metalworking fluids. The minimum detectable concentration of this method was 0.06 mg / m ~ 3 (for collecting 960 L air samples), the RSD of precision was 3.1% ~ 5.5%, the recovery of samples was 95.2% ~ 99.4% with the detection limit of 0.06 mg ~ 0.08 mg, the sampling efficiency was 96.2% ~ 98.9%, and the elution efficiency was 95.2% ~ 99.2%. Conclusion The validation indexes of the method are in accordance with the requirements of GBZ / T 210.4-2008 Occupational Health Standard Guide Part 4: Determination of Chemical Substances in the Air at Workplace, which is applicable to the concentration of metalworking fluid in the air of workplace Detection.