The method of determination for sulfur dioxide in the air of workplace by ion chromatography without derivatization
10.3760/cma.j.cn121094-20201104-00613
- VernacularTitle:工作场所空气中二氧化硫的离子色谱无衍生测定法
- Author:
Xu YANG
1
;
Bin ZHOU
;
Lina TANG
;
Xuemin LIU
Author Information
1. 401120 重庆惠能标普科技有限公司
- Keywords:
Sulfur dioxide;
Triethanolamine;
Occupational environment;
Non derivative detection;
Ion chromatography
- From:
Chinese Journal of Industrial Hygiene and Occupational Diseases
2021;39(10):783-786
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To establish a method for the determination of sulfur dioxide (SO 2) in the air of workplace, which including the process of collection by absorption in triethanolamine aqueous solution and the process of analysis and detection by iron chromatography directly without derivatization. Methods:SO 2 in the air of workplace was collected at a flow rate of 0.5 L/min for 15 min through 10 ml of 3% triethanolamine aqueous solution filled in a porous glass plate absorption tube. The absorption solution passed through IonPacAS14A analytical column (4 mm×250 mm) and IonPacAG14 protective column (4 mm×50 mm) at a column temperature of 30 ℃, using Na 2CO 3 (3.0 mmol/L) -NaHCO 3 (1.0 mmol/L) as mobile phase with the flow rate of 1.2 ml/min, and was detected by conductivity detector. Results:It showed that SO 2 in triethanolamine solution could be stored for at least 7 d at room temperature (25 ℃) and 37 ℃. There was a linear relationship within the determination range of 0-8.00 μg/ml, the linear correlation coefficient was 0.9999. The sampling absorption efficiency was 98.1%-100.0%, the detection limit of the method was 0.018 μg/ml, the minimum detection concentration was 0.024 mg/m 3 (based on V0=7.5 L) . The recovery rate was 99.22%-101.69%, the intra batch precision was 0.41%-1.34%, and the inter batch precision was 0.73%-1.77%. Conclusion:The method has the advantages of simple operation, high sensitivity and good accuracy. It can prevent SO 2 from being oxidized and realize the direct detection of SO 2 in the air of workplace without derivation.
