论文部分内容阅读
目的建立工作场所空气中磷酸的采集及离子色谱测定方法。方法采用超细玻璃纤维滤膜采集样品,用超纯水超声洗脱,经0.22μm滤膜过滤后直接进样,经阴离子色谱柱分离,电导检测器进行测定。结果该方法在1.4~60μg/ml范围内呈线性关系,相关系数为0.999 7,定量下限为1.4μg/ml,最低定量浓度为0.2 mg/m~3(以采样75 L计),精密度为1.9%~4.2%,平均回收率为99.9%,平均采样效率为100.0%,平均洗脱效率为95.2%。结论方法采样效率高,最低检出浓度低,准确度和精密度高,能满足工作场所空气中磷酸的采集及检测要求。
Objective To establish a method for the determination of phosphoric acid in the air of workplace and ion chromatography. Methods Ultrafine glass fiber membrane was used to collect samples. The samples were eluted with ultrapure water and filtered through 0.22μm membrane. The samples were directly separated by anion chromatography and detected by conductance detector. Results The method showed a linear relationship in the range of 1.4-60 μg / ml with a correlation coefficient of 0.999 7, a lower limit of quantitation of 1.4 μg / ml and a minimum concentration of 0.2 mg / m 3 1.9% ~ 4.2%, the average recovery was 99.9%, the average sampling efficiency was 100.0% and the average elution efficiency was 95.2%. Conclusion The method has the advantages of high sampling efficiency, low minimum detectable concentration, high accuracy and precision, and can meet the requirements of phosphoric acid collection and detection in the air of the workplace.