Objective To establish a method for the quantitative analysis of iodine and its compounds in workplace air by ion chromatography pulsed amperometric detector.
Methods Air samples were collected using alkaline-activated carbon solid-phase extraction tubes and eluted with 10 mL of the 20 mmol/L sodium bicarbonate solution for 30 minutes. The eluate was separated using the Dionex ICS-5000 ion chromatography system with the Dionex IonPac AS11-HC high-performance anion separation column and detected by the pulsed amperometric detector, with the retention time for qualitative analysis and the peak area for quantitative analysis.
Results The method had a correlation coefficient of 0.999 7 for the standard curve, a detection limit of 0.519 μg/L (25 μL injection volume), and a minimum quantifiable mass concentration of 2.3 μg/m3 calculated using a sampling volume of 7.5 L. The method had good reproducibility, with relative standard deviations ranging from 2.72% to 4.10% and an internal recovery rate of 95.8% to 98.0% for simulated samples. The average elution efficiency of alkaline-activated carbon solid-phase extraction tubes was more than (94.1% ±2.65%). Iodine and its compounds could be stably stored for 5 days at 4 ℃.
Conclusions The quantitative analysis method of the ion chromatography pulsed amperometric detector was fast, convenient, efficient, and accurate. It is satisfied with the requirement for the determination of iodine and its compounds in workplaces.
DownLoad: