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AMulti-line analysis by ICP/OES of cobalt in complex solutions at different instrument setting

Lamia Nenni, Mourad Amara

The determination of trace amount of cobalt ion has been investigated in different operating conditions of analysis. The analysis was performed by varian (induced coupled plasma - optical emission spectroscopy) ICPOES vista instrument using three wavelength lines which provide interferences of several cations and anions. Throughout this work, Relative Standard Deviation values are determined and examined as a function of Argon flow (carrier, intermediate and outer), uptake time (intergration time in nebulizer), interferences of anions (chloride, nitrate and nitrite) and cations (Na, Pb and Ba). It has been found that, nitric acid may perform a good linearity with a minimum RSD compared to aqueous or other acidic medium (hydrochloric and phosphoric acids). Different time of uptake, residence and transportation of sample are investigated.