Determination Of Non-Rare Earth Impurites In High-Purity Rare Earth Oxides By Zeeman Graphite Furnace Atomic Absorption Spectrometry After Extraction

Graphite furnace atomic absorption spectrometry due to high sensitivity, using less samples and analysis of the advantages of speed commonly used to analyze trace elements, but for high purity rare earth rare earth impurities in the non-determination of rare earth matrix due to the interference, so that applications are restricted。Based on the pyrrolidine dithio carbamate ammonium (APDC) under certain conditions can be copper, lead, nickel, chromium and the formation of complex, but not with the role of rare earth elements and other features, using APDC as complexing agent, methyl isobutyl butyl ketone (MIBK) as solvent extraction, separation, enrichment, after graphite furnace atomic absorption spectrometry with continuous determination of high-purity cerium oxide of copper, lead, nickel, chromium。In this paper, we have discussed in detail the extracting condition(amount of APDC,PH,phase ratio,interfering elements) and the measuring condition(ashing temperature,atomization temperature) for the determination of high-purity cerium oxide, the results show that the determination condition were:copper(3mlAPDC, PH=3, the phase ratio was 6:1, the ashing temperature was 1200℃, the atomization temperature was 2000℃),lead(2mlAPDC, PH=3, the phase ratio was 6:1, the ashing temperature was 850℃, the atomization temperature was 1600℃),nickel(3mlAPDC, PH=3, the phase ratio was 5:1, the ashing temperature was 1100℃, the atomization temperature was 2300℃),chromium(3mlAPDC, PH=3, the phase ratio was 6:1, the ashing temperature was 1500℃, the atomization temperature was 2300℃), The method is accurate, beer's law is obeyed in the range of 0-0.06μg/ml for curve of standard series, RSD(n=10)was 3.09%-9.72%, the recoveries of test were:copper(98.63%-100.44%); lead(98.03%-100.78%); nickel(99.71%-100.40%); chromium(96.57%-98.31%)。...