空气中磷酸测定方法的研究

目的对《GBZ/T160.30-2004工作场所空气中磷酸的钼酸铵分光光度法》的实验条件进行改进,从而提高方法的准确性和灵敏度。方法用孔径为0.4μm的超细玻璃纤维滤膜采集工作场所空气中的磷酸,应用改进后的方法进行检测,并采用检出限、精密度和加标回收率等指标对方法的准确性进行验证。结果改进后的方法在1.00~100.0μg范围内呈线性关系,相关系数0.999 8~0.999 9,检出限为0.078μg/mL,最低检出浓度为0.001 0 mg/m3(以采样75L计),精密度为1.58%~7.91%。加标回收率为91.50%~95.37%。结论改进后的钼酸铵分光光度法,具有操作简便、响应值大、灵敏度高、准确度好等特点,与国标方法比较有明显优势。

Study on the determination method of phosphoric acid in air

Objective To improve the determination method of phosphoric acid in workplace air,in order to enhance the sensitivity and accuracy of the method.Methods Phosphoric acid in workplace air was sampled with filter film of super thin glass fiber of 0.4μm and the improved method was applied for testing,The credibility of the method wasvaluated by the detection limit,precision and recovery.Results There was a good linearity within the concentration of 1.00 ～ 100.0μg with the correlation coefficient of 0.999 8 ～ 0.999 9.The detection limit of this approach was 0.078μg/mL,and the lowest concentration of quantification was 0.0010mg/m3 (sampling volume was 75L).The precision was 1.58％ ～ 7.91％,the recovery was 91.50％ ～95.37％.Conclusion The improved approach was simple to operate,and had high response value,good sensitivity and accuracy,which was superior to GB method.