The invention belongs to the technical field of high-purity
trace element analysis, and relates to an
analysis method for determining a
silicon element in high
aluminium. According to the invention, 5mL-15 mL of
sodium hydroxide (100g / L) is added, an electric
hot plate is controlled at about 120-150 V, heating is carried out for about 40-70 min, then the electric
hot plate is taken out, cooling is carried out to
room temperature, 2-5 mL of
nitric acid is added, and the material is placed on the electric
hot plate for reheating to dissolve salts. The method takes
sodium hydroxide, hydrochloricacid,
nitric acid, and
hydrofluoric acid for dissolving a sample to obtain a clarified sample solution; an optimum analysis
spectral line is determined through interference experiments, and the measurement accuracy is increased; a determination scope of the method is wide, the measurement
lower limit is 0.001%, and the measurement upper limit is 0.02%. The synchronous
processing of a sample and preparation of a calibration solution are employed for measuring the
silicon element, the analysis error is minimum, and the method
repeatability is good; the
recovery rate and the precision are good;through standard sample analysis and method reinspection, the
analysis method has the advantages of good accuracy and stable method, and completely accords with the requirement of
trace element analysis.