Abstract
A comparative study of the effectiveness and possible mechanism of the releasing action of some common reagents (Ca, Sr, La and Pr) in eliminating silicate interference during determination of magnesium by flame atomic absorption spectrometry (FAAS) was performed using a continuous titration method, based on the releasing and inhibition effect. For that purpose solutions of the releasing agents, along with a very low concentration of magnesium as indicator, were continuously titrated by standard Na 2SiO 3 solution. Simultaneously, as the titrand solution was aspirated into the air-hydrogen flame, the magnesium AA signal was monitored. In this way titration curves of a characteristic shape were obtained. Mole ratios of SiO 2 to the corresponding releasing agents at the end-point of the titration were used for evaluating the effectiveness of the releasing action and explaining possible reactions that take place in evaporating droplets.
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