Determination of eight impurity components in high-quality quartz sand by inductively coupled plasma atomic emission spectrometry-internal standard method
Abstract：The main component of high-quality quartz sand is SiO2. The content of impurities in high-quality quartz sand affects its quality directly. The traditional measurement methods of impurities include spectrophotometry and atomic absorption spectrometry. However, these methods have some disadvantages such as long process and inability for simultaneous determination of multi-components, which difficult to meet the actual detection requirements. The sample was decomposed using hydrofluoric acid, nitric acid and perchloric acid. The standard solution of indium was added as the internal standard to simplify the experimental process. The determination errors caused by matrix effect, instrument drift and inaccurate constant volume were eliminated. A method for the determination of eight impurities (including Al2O3, Fe2O3, TiO2, CaO, MgO, K2O, Na2O and P2O5) in high-quality quartz sand by inductively coupled plasma atomic emission spectrometry (ICP-AES)-internal standard method was established. The linear correlation coefficients of calibration curves within linear range were between 0.9994 and 1.0000. The limit of detection of each component was in range of 0.0001%-0.0038% (mass fraction). The components in national standard material (GBW07837) were determined according to the experimental method, and the relative standard deviations (RSD, n=12) of results were between 0.92% and 6.6%. The found results were consistent with the certified values. Eight components in actual sample of high-quality quartz sand were determined according to the experimental method. The RSDs (n=6) were between 0.59% and 8.1%, and the determination results were basically consistent with the reference values.
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