Comparison between pyrophosphate method and infrared spectrophotometry for determination of silicon dioxide content in dust / 中华劳动卫生职业病杂志

ABSTRACT

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.