Alkali absorption ion chromatography method for the determination of toxic chloride substances in the workplace
Objective To explore a rapid and accurate method to detect toxic chloride in the workplace and reduce the harm of toxic chloride to laboratory personnel.Methods The mixed alkaline solution of 3.3 mmol/L sodium carbonate and 3.0 mmol/L sodium bicarbonate was used to absorb chlorine in the workplace,to improve the large bubble absorption tube collection method in GBZ/T 160.37-2004"determination of chloride in the air of workplaces",and the ion chromatography method was used to replace the methyl orange spectrophotometric method for determination,and the air in the inorganic chemistry laboratory was used as the sample for comparison and verification of the two methods.Results The detection limit of the improved ion chromatography method was 0.05 mg/L,and the minimum detection concentration was 0.05 mg/m3,which was better than the detection limit of 0.2 mg/L and the minimum detection concentration of 0.2 mg/m3 in GBZ/T 160.37-2004"determination of chloride in the air of workplaces".The environmental air samples from two workplaces were collected for six repeated determinations to verify the precision,and the relative standard deviations were 0.62％and 2.33％,respectively,which met the range requirements(0.7％-2.8％)of the relative standard deviation in the methyl orange spectrophotometric method in GBZ/T 160.37-2004"determination of chloride in the air of workplaces".The accuracy comparison experiment between the control sample of four kinds of chlorinated substances and methyl orange spectrophotometry was carried out.The relative error range between the average value and the certified value of quality control standard sample was-1.48％-3.43％and-2.35％-2.88％,respectively.Conclusion Ion chromatography has high sensitivity in the detection of chloride,which can improve the efficiency of automated analysis and meet the requirements for the determination of toxic substances in the workplace.
Ion chromatographySpectrophotometryWorkplaceChloride
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