Abstract: The composition of denitration catalyst for selective catalytic reduction (SCR) is complex. The interference of major elements on determination of potassium, sodium and aluminum was investigated. The solution to be tested was first prepared from SCR catalyst by high temperature melting technique. The contents of potassium, sodium and aluminum in the SCR catalyst were determined by inductively coupled plasma emission spectrometry (ICP-AES). The results showed that titanium had a serious spectral interference on each element of K, Na, Al. However, interference coefficient method could eliminate the spectral interference. The calibration curve of each element was greater than 0.999, and the correlation coefficients of K, Na, Al calibration curves were all greater than 0.999, the relative standard deviation was less than 3%, and the recovery rate was 97%-102%.

Key words: SCR catalyst, inductively coupled plasma emission spectrometry, spectral interference, interference coefficient, high temperature melting, Potassium, Sodium, Aluminum