Application of multi-component fitting technique for determination of boron in nickel-based superalloy GH4720Li by inductively coupled plasma atomic emission spectrometry
ZHANG Liang-liang, LEI Ya-ning, ZHAO Juan-hong
AVIC Metal Test Technology Co., Ltd., Xi′an 713801, China
Abstract：The sample was dissolved with hydrochloric acid and hydrogen peroxide (or nitric acid). The multi-component spectral fitting (MSF) technique was used to correct the spectral interference and eliminate the influence of coexisting elements including nickel, chromium, cobalt, aluminum, titanium, tungsten, molybdenum, iron and manganese on the determination. The determination method of boron in nickel-chromium-cobalt alloy sample by inductively coupled plasma atomic emission spectrometry (ICP-AES) was established. B 249.677nm, B 208.957nm and B 182.578nm were selected as the analytical lines. Two calibration curves were prepared using two standard modes, i.e., synthetic sample and standard sample of nickel-chromium-cobalt alloy. The results showed that whether which calibration mode was adopted, the correlation coefficients of calibration curves were poor if the correction was not conducted by MSF model. The maximum value was only 0.828 (for line of B 208.957nm). After correction using MSF model, however, the correlation coefficients at lines B 249.677nm and B 208.957nm were both higher than 0.990. Meanwhile, the correlation coefficient at line B 208.957nm was 0.920. Three standard nickel-chromium-cobalt alloy samples with different boron content were determined by two calibration modes with correction using MSF model, respectively. The results indicated that the determination results of calibration mode using synthetic sample were better than those of calibration mode using standard sample. Therefore, the MSF model and the calibration mode using synthetic sample were used as the analysis conditions for boron in nickel-chromium-cobalt alloy samples. If B 182.578nm was selected as analytical line, the analysis time and cost would be increased. Moreover, the correlation coefficient and consistence to certified values at line B 208.957nm were lower than those at line B 249.677nm. Thus B 249.677nm was finally selected as the analytical line in this study. The precision tests showed that the relative standard deviation (RSD, n=8) of determined results at line B 249.677nm were between 2.0% and 11.0% for samples A40 and 198. The detection limit of method was 0.0005%. Under the selected experimental conditions, the alloy sample GH4720Li was analyzed and compared with ion selective electrode method. The results indicated that the determination results of two methods were basically consistent.
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