干扰系数-等离子发射光谱法测定脱硝催化剂中的钾、钠、铝含量

采用高温熔融技术处理选择性催化还原(SCR)脱硝催化剂样品,在电感耦合等离子发射光谱法测定SCR脱硝催化剂中的K,Na,Al含量时采用干扰系数法消除各主量元素对K,Na,Al的干扰。结果表明:Ti对K,Na,Al含量的测定存在较为严重的光谱干扰,采用干扰系数法消除了光谱干扰;K,Na,Al元素的校准曲线相关系数均大于0.999,相对标准偏差小于3%,回收率为97%~102%。

DETERMINATION OF POTASSIUM,SODIUM AND ALUMINUM IN SCR DENITRATION CATALYST BY INTERFERENCE COEFFICIENT PLASMA EMISSION SPECTROMETRY

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%.