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Effects of organic acids in inductively coupled plasma optical emission spectroscopy Hettipathirana, Terrance Dayakantha


The effects of organic acids in an inductively coupled plasma (ICP) have been studied with reference to solvent introduction and plasma excitation conditions. When compared with water, an increase in emission intensity for Mg, Cd, and Zn atom and ion lines is observed when organic acids are present in the sample solution. The presence of organic acids causes an increase in both the efficiency of nebulization and the temperature in the lower region of the central aerosol channel. The feasibility of using a semi-automated flow injection (FI) method to investigate the interference effects of acetic acid over a wide range of analyte and interferent concentration has been studied. This FI-ICP procedure makes use of the concentration gradient formed by the analyte in the FI system. Using this method, a response surface can be constructed quickly and with the preparation of relatively few solutions. The response surface shows the system response (for example, emission intensity) as a function of analyte and interferent concentrations. This FI-ICP procedure can be used to map the interference surface prevalent under any set of experimental conditions.

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