Abstract：In national standard GB/T 1549-2008 Chemical analysis methods of glass, glass marble and vitreous fiber, the content of silicon dioxide in rock wool is determined by gravimetry-silicon molybdenum blue spectrophotometry and potassium fluosilicate titration. The determination results are accurate, but there are some shortcomings such as complicated operation, long analysis period and environmental pollution. In this paper, the rock wool sample was dissolved by mixed alkali fusion and acidification treatment. Si 251.611 nm was selected as the analytical line. The standard solution series were prepared by matrix matching method to eliminate the influence of matrix effect. The analysis method for the determination of silicon dioxide in rock wool by inductively coupled plasma atomic emission spectrometry (ICP-AES) was established. The linear correlation coefficient of calibration curve within the linear range of silicon dioxide was r=0.999 9. The limit of detection and limit of quantification for silicon dioxide were 0.049 5% and 0.248%, respectively. The experimental method was applied for the determination of silicon dioxide in actual rock wool samples. The relative standard deviation (RSD, n=11) of measured results was less than 1.5%, and the spiked recoveries were between 96% and 104%. The contents of silicon dioxide in rock wool samples were determined according to the experimental method, and the found results were consistent with those obtained by national standard method.
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