Determination of phosphoric acid in the air of workplace by ion chromatography

Objective To develop a method to determin phosphoric acid in the air of workplace by ion chromatography. Methods Phosphoric acid was collected by millipore filter and washed by deionized water then detected by ion chromatography. Results Linearity range of test was 0～20 μg/ml, relelive standard deviation (RSD) was 1.95%～3.31%, the elution efficiency was 103.0%～ 109.6%, determination limit was 0.1 μg/ml (when sample size was 20.01 ), concentration limit was 0.01 mg/m3(when the collected air was 75 L).Conclusion This method is convenient for air collection, simple, with high sensitivity and good precision, is a good method for determination of phosphoric acid in the air of workplace. Key words: Chromatography, ion exchange;  Phosphoric acids;  Workplace