[Determination of ethylenediamine in the air of workplace by Ion chromatography]

Objective: To establish a method to detect the concentrations of ethylenediamine in the air of workplace by Ion chromatography. Methods: Ethylenediamine in the air of workplace adsorpted by Silicone tube, then ultrasonic desorped by Sulfuric acid solution (0.1 mol/L) , the desorption solution qualitative and quantitative determination by Ion chromatography. Results: For ethylenediamine, the calibration curves were liner in the range of 0.1-100.0 μg/ml, the method detection limit is 0.1 μg/ml, the minimum detectable concentration is 0.13 mg/m(3) (in terms of sampling 7.5 L) . The desorption efficiency is more than 90% on spiked levels of 2.0, 4.0 and 8.0 μg/ml, the average desorption efficiency of the method was 96.1%, the precision was 1.8%-2.1%. The recovery rate of the added standard is 98.5%-104.2%. Conclusion: The method simplifies the preprocessing steps and improves the sensitivity. All the indexes are in conformity with the requirements of the method formulation guide. It is suitable for the determination of ethylenediamine in the air of the workplace.