两种采样材料对工作场所空气中氟化物的采样效率

Comparison of Sampling Efficiency between Monopotassium Phosphate and Sodium Hydroxide Soaked Filter Paper for the Determination of Fluorides in the Air of Workplace

[目的]比较不同采样材料对工作场所空气中氟化物的采样效率。[方法]用磷酸氢二钾的浸渍玻璃纤维滤膜和氢氧化钠的浸渍玻璃纤维滤膜作为采样材料,在同一作业岗位对空气中氟化物进行短时间采样,检测短时间接触容许浓度,滤膜以淋洗液碳酸钠-碳酸氢钠洗脱,均用离子色谱法测定。[结果]经t检验分析表明,以蒸气态、气溶胶形式存在的氟化物用磷酸氢二钾浸渍的玻璃纤维滤膜采样,其采样效率优于氢氧化钠浸渍滤膜采样方法,在0.10～1.60μg/mL范围内线性关系良好,相关系数为0.9992,检出限为0.02μg/mL,采用高、中、低3个浓度加标回收,加标回收率为99.1%～104.7%。[结论]对两种采样材料的采样效率比较结果表明,以利用磷酸氢二钾浸渍玻璃纤维滤膜对工作场所空气中氟化物采样并用离子色谱法检测的效率更高,操作简单,重复性好,洗脱率、回收率、灵敏度均能满足工作场所空气中氟化物的检测要求。故该采样材料可推荐为工作场所空气中以气溶胶且是蒸气态为主的氟化物测定的采样材料。

[ Objective ] To compare the efficiency of different sampling materials for fluorides in the air of workplace. [ Methods ] Glass fiber membrane filters soaked in K2HPO4 and NaOH respectively were used for short time air sampling of fluorides at the same Workplace with the requirement of permissible concentration-short term exposure limit （PC-STEL）. After eluted with Na2CO3-NaHCO3 solution, the samples were analyzed by ion chromatography. [ Results ] The results of t-test analysis showed better sampling efficiency in K2HPO4 soaked membrane filter for fluorides in vapor phase and in aerosols. The linearity was excellent within the range of 0.10-1.60μg/mL, with a correlation coefficient of 0.999 2, and the detection limit was 0.02 p^g/mL. The mean spike recovery was 99.1%-104.7%. [ Conclusion ] The study findings recommend K2HPO4 impregnated glass fiber membrane filter coupled with ion chromatography for air fluorides sampling at workplace, which meet the requirement of vaporous fluorides determination with simple operation, good repeatability, good elution rate, and excellence in recovery and sensitivity.