Abstract：The accurate determination of scandium, iron and titanium in chlorination dust has important significance to judge the separation degree of scandium/iron and scandium/ titanium and to evaluate the recovery of scandium. The determination of scandium, iron and titanium in chlorination dust by inductively coupled plasma atomic emission spectrometry (ICP-AES) was investigated. The chlorination dust was treated using two methods, i.e., acid dissolution (hydrochloric acid-nitric acid-phosphoric acid) and alkali fusion (sodium hydroxide). The determination results of scandium, iron and titanium in two sample preparation methods were compared. It was found that the acid dissolution method was simple and easily conducted. Furthermore, the determination results were more accurate and reliable. The spectral lines of 335.372, 259.940 and 334.188nm were selected as the analytical lines for scandium, iron and titanium through the interference test of coexisting elements. The acidity test indicated that the interference to testing elements could be ignored when the concentration of phosphoric acid in sample solution was less than 10% (volume fraction). In this method, the correlation coefficients of linear regression equations of calibrations curves for elements were all higher than 0.999. The detection limit for scandium, iron and titanium was 0.0010%, 0.0028% and 0.0021%, respectively. The lower determination limit was 0.0100%, 0.0280% and 0.0210% respectively. The determination results of scandium, iron and titanium in chlorination dust according to experimental method were consistent with those obtained by spectrophotometry. The relative standard deviations (RSD) were between 1.1% and 2.7%. The recoveries were between 93% and 107%.
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