Abstract
A method for the determination of iridium impurity in platinum jewelry alloys by inductively coupled plasma atomic emission spectrometry (ICP-AES) was reported. Spectral interferences of Au, Cr, Cu, Fe, Ni and Pt to Ir at specific wavelengths have been investigated. The spectral coincidence profiles were recorded and interfering lines were identified. The optimum analytical line of 38 iridium emission lines was 215.268 nm {156}. Ir 212.681 {158} and Ir 205.116 nm {164} can be used as analytical lines after rectified by Inter-Element Corrections (IEC) coefficients. Ir 186.250 nm is a new candidate analytical line. Ir 224.268 nm is not being recommended by reason of the severe spectral interference from Cu and Ni. Ir 322.08 nm is not being recommended for its weaker emission intensity. Validation was performed in terms of detection limits, linearity, precision and recovery. The relative standard deviations (RSD) and recoveries of the method are in the range of 0.59%~1.84% and 85.5%~93.2%, respectively.
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