[Comparison between pyrophosphate method and infrared spectrophotometry for determination of silicon dioxide content in dust].

Objective: To discuss the difference between pyrophosphoric acid method and infrared spectrophotometry for the determination of silica content in dust. Methods: The content of silica in the laboratory comparison samples organized by CDC Occupational Health Institute in China in 2018, and purchased quality control samples were determined by pyrophosphate method. Meanwhile, the samples were qualitatively and quantitatively analyzed by infrared spectrophotometry, and the results obtained by the two methods were compared. Results: Four samples (062C1、062C2、GDOHZKTG012-1、GDOHZKTG012-2) were detected by pyrophosphate method and infrared spectrophotometry. The results of pyrophosphate method were 55.49%, 5.24%, 4.90% and 54.72%, respectively. The results of infrared spectrophotometry were 0.91%, 1.87%, 1.29% and 1.16% respectively. Conclusion: The content of silica in dust determined by pyrophosphate method is higher than that by infrared spectrophotometry.目的： 探讨焦磷酸法与红外分光光度法测定粉尘中二氧化硅含量的差异性，为方法的修订提供依据。 方法： 采用焦磷酸法和红外分光光度法分别对2018年中国疾病预防控制中心职业卫生与中毒控制所发放的盲样（062C1、062C2）以及粉尘中游离二氧化硅质量控制样品（GDOHZKTG012-1、GDOHZKTG012-2）进行测定，并对2种方法测得的二氧化硅含量进行比较。 结果： 焦磷酸法检测4个样品（062C1、062C2、GDOHZKTG012-1、GDOHZKTG012-2）中二氧化硅的含量分别为55.49%、5.24%、4.90%、54.72%，红外分光光度法的检测结果分别为0.91%、1.87%、1.29%、1.16%。 结论： 焦磷酸法测得的粉尘中二氧化硅的含量高于红外分光光度法，建议对粉尘中二氧化硅含量测定方法进行修订。.