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目的:建立低毒、准确、灵敏的二乙醇胺-盐酸副玫瑰苯胺测定作业场所空气中二氧化硫的方法。方法:采用体积比为0.05%的二乙醇胺为吸收液,通过在酸性条件下与氨基磺酸及盐酸副玫瑰苯胺进行显色反应,在548 nm处采用分光光度法测定。结果:二氧化硫浓度在0.1μg/ml～2.00μg/ml范围内呈良好的线性关系(r2=0.9996),回收率在94.0%～106.0%范围,相对标准偏差小于2.0%,检出限为0.1 mg/m3。结论:采用二乙醇胺为吸收剂,建立的方法具有低毒、环保的优点,可满足作业场所空气中二氧化硫的测定,而且克服了国标方法的四氯汞钾吸收液剧毒的不足。
Objective: To establish a low toxicity, accurate and sensitive method for the determination of sulfur dioxide in workplace air with diethanolamine hydrochloride pararosaniline hydrochloride. Methods: The diethanolamine was used as absorbent in a volume ratio of 0.05%, and its color was determined by spectrophotometry at 548 nm by the color reaction with sulfamic acid and pararosaniline hydrochloride under acidic conditions. Results: The concentration of sulfur dioxide showed a good linear relationship (r2 = 0.9996) in the range of 0.1μg / ml ~ 2.00μg / ml, the recovery was in the range of 94.0% -106.0%, the relative standard deviation was less than 2.0% and the limit of detection was 0.1 mg / m3. Conclusion: Using diethanolamine as absorbent, the established method has the advantages of low toxicity and environmental protection, can meet the determination of sulfur dioxide in the workplace air, and overcomes the toxic shortage of the tetrachloromercury-mercury absorption solution of the national standard method.