Comparative Analysis of Determination Methods for Free Silica Content in Dust during Railway Tunnel Construction
According to the standard"Determination of dust in the air of workplace-part 4:Content of free silica in dust"(GBZ/T 192.4-2007),this paper observed the experimental process through on-the-spot investigation and confirmed the main sources of railway tunnel construction samples and the applicability of sampling methods,and compared and analyzed the determination results of free silica content in dust samples by pyrophosphoric acid method and infrared spectrophotometry respectively.It is analyzed that the main factors affecting the determination results of pyrophosphoric acid method are digestion temperature,and the main factors affecting infrared spectrophotometry are laboratory humidity,sample weight and dust color,so it is concluded that pyrophosphoric acid method is better than infrared spectrophotometry in the determination of free silica content in railway tunnel construction dust at present.
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