论文部分内容阅读
目的建立一种工作场所中磷酸、硫酸的离子色谱同时测定法。方法工作场所空气中的磷酸、硫酸用微孔滤膜采集,用超纯水超声洗脱,洗脱液经0.22μm滤膜过滤后直接进样,用离子色谱仪检测。结果磷酸、硫酸的保留时间分别为13.00min和15.16min,在2.0~16.0mg/L范围内线性关系良好,相关系数均在0.999以上,检出限分别为0.023mg/L和0.036mg/L,相对标准偏差在0.2%~0.9%,加标回收率为98.0%~101.0%。结论离子色谱法操作简单,重复性好,回收率、灵敏度高,均能满足工作场所空气中磷酸、硫酸的检测要求。
Objective To establish a simultaneous determination of phosphoric acid and sulfuric acid in the workplace by ion chromatography. Methods Phosphoric acid and sulfuric acid in the air of the workplace were collected with a microporous membrane and eluted with ultrapure water ultrasonically. The eluent was filtered through a 0.22 μm membrane and directly injected into an ion chromatograph. Results The retention time of phosphoric acid and sulfuric acid were 13.00min and 15.16min, respectively. The correlation coefficients were all above 0.999 in the range of 2.0-16.0mg / L with the detection limits of 0.023mg / L and 0.036mg / L, respectively. The relative standard deviations (RSDs) ranged from 0.2% to 0.9%. The spiked recoveries ranged from 98.0% to 101.0%. Conclusion Ion chromatography has simple operation, good repeatability, high recovery and high sensitivity, which can meet the detection requirements of phosphoric acid and sulfuric acid in the air of the workplace.