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Interference Effects of Excess Lithium on the Emission Signal of the Calcium and Strontium Ionic Lines during Inductively Coupled Plasma Emission Spectrometry: Simulation in Terms of the Simplified Collisional Radiative Recombination Rate Model

Mark Fungayi Zaranyika and Courtie Mahamadi

ICP-AES Ca and Sr ion line signals were measured on 0-30 μg/mL Ca and Sr solutions, in the absence and presence of 1000 μg/mL Li as easily ionizable interferent, and the effect of the interferent on analyte calibration curve simulated using a simplified collisional radiative recombination rate model. Close agreement between experiment and theory was obtained for the full range of concentrations studied in the case of SrII, while the theoretical Ca ion line calibration curve exhibited close agreement below 10 μg/mL Ca concentration in the test solution, and a positive deviation of up to 18% from the experimental curve at higher Ca concentrations. The data obtained successfully demonstrates the potential of the simplified collisional radiative recombination rate model for simulating the effects of easily ionizable interferents on high ionization potential analytes.