Establishing a method analyze free silica content in respirable dust by infrared spectrophotometer on M-500. The author applied a new method to analyze free silica content in respirable dust samples from construction material producing units and the results were obtained as follows: The directrix with linear span was 53-210. Linear equation Y = 1.1488X-0.000039 with r = 99.98; CV = 0.041; sensitivity: 50llg. The process of sample analysis with recovered rate reaches 84.3 percent. The results of analyzing free silica content in respirable dust samples were as follows: Thai Nguyen refractory brick: 18.4 to 26.4 percent; Dong Nai refractory brick: 12 to 1.6 percent; Hai Phong cement factory: 3.4 to 5 percent; Ha Tien cement factory: 0.6 to 2.1 percent; Phu Ly quarry 4.6 to 5 percent; Hoa An quarry: 22.8 to 23.2 percent.
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