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 0.10-1.60 μg/mL, with a correlation coefficient of 0.999 2, and the detection limit was 0.02 μg/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.
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