Determination of trace phosphorus in high purity iron by inductively coupled plasma emission spectrometry
ZHOU Xi-lin1, YAN Li-dong2, LI Fen3, TIAN Xiao-xi2, LIU Shou-qiong1
1.Aluminum and Magnesium Center of Chong Qing Academy of Metrology and Quality Inspection, Chongqing 401121, China;2.University of Science and Technology Liaoning, Anshan 114051, China;3. Dept. of Chemical Engineering, Chongqing Technovocational College of Industry, Chongqing 401120, China
Abstract：After ammonium phosphate was extracted with methyl isobutyl ketone (MIBK) to form phosphomolybdic heteropoly acid with phosphorus in 0.57-1.43 mol/L nitric acid medium, phosphorus could be separated with iron substrate. Thus, a method for determination of phosphorus in high purity iron was established by inductively coupled plasma atomic emission spectrometry (ICP-AES) with 213.618 nm as the analytical line. The linear regression equation of the calibration curve was I = 15.04ρ +0.012 1 with the correlation coefficient of 0.999 6, and the detection limit was 0.020 mg/L. With extraction separation and the suitable spectral lines as the analytical line for phosphorus, there was no interference from the matrix and the coexisting elements with the determination. The system was applied to the determination of phosphorus in multiple certified reference materials of high purity iron, the results were consistent with the certified values and the relative standard deviations (n=10) were in the range of 0.54%-2.9%. The method was applicable to the determination of phosphorus in the range of 0.000 10%-0.010 % in high purity iron.
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