Study on preparation of ultra-pure iron oxide and its application in determination of impurity elements in high-purity iron compounds by inductively coupled plasma atomic emission spectrometry
YU Sheng-rong,WANG Xiao-jun,QIN Wen-xia,GONG Qi
School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,China
Abstract：Accurate determination of trace impurity elements in high purity iron compounds by inductively coupled plasma atomic emission spectrometry (ICP-AES) requires the use of a higher purity iron as matrix to examine its interference in the determination of impurity elements. Therefore,analytical pure ferrous sulfate was taken as a raw material to obtain high-purity iron oxide in which impurity elements Al,Cd,Co,Cr,Cu,Mg,Mn,Ni and Zn were all below the detection limit. The high-purity iron oxide was used as the matrix of a series of standard solutions to obtain matrix-matched standard solutions which were then used to plot the calibration curve,with which the contents of impurity elements of GBW01402d high-purity iron certified reference material were determined,and its found that the measured values of the impurity elements were consistent with their certified values. The interference correction method was studied for the determination of Al,Cd,Co,Cr,Cu,Mg,Mn,Ni and Zn impurities in high-purity iron and iron compounds with non-matrix-matched standard solutions and the results showed that the spectral interference with Al,Co,Cr,Cu,Mg and Zn could be corrected by the off-peak correction method,while the interference with Cd,Mn and Ni necessitated the multicomponent spectral fitting for correction. The proposed correction method was applied to the determination of trace impurities in high-purity iron compounds,with high accuracy for the elements Al,Cd,Cr,Cu and somewhat less accurate for the elements Co,Mg,Mn,Ni,Zn.
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YU Sheng-rong,WANG Xiao-jun,QIN Wen-xia,GONG Qi. Study on preparation of ultra-pure iron oxide and its application in determination of impurity elements in high-purity iron compounds by inductively coupled plasma atomic emission spectrometry. , 2013, 33(11): 12-20.
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