Analytical Sciences

Application of Internal Standardization to Rapid Coprecipitation Technique Using Lanthanum Phosphate for Flame Atomic Absorption Spectrometric Determination of Iron and Lead

Shigehiro KAGAYA,  Zanariah Abdul MALEK, Yasuko ARAKI, and Kiyoshi HASEGAWA

Department of Chemical and Biochemical Engineering, Faculty of Engineering, Toyama University, Gofuku, Toyama 930-8555, Japan

By applying an internal standardization, we could use a rapid coprecipitation technique using lanthanum phosphate as a coprecipitant for preconcentration of iron(III) and lead in their flame atomic absorption spectrometric determination. Indium as an internal standard was added to the initial sample solution together with lanthanum and phosphoric acid; the coprecipitation of iron(III) and lead was then carried out at pH about 3. After measuring the atomic absorbances of iron, lead, and indium in the final sample solution, we determined the contents of iron(III) and lead in the original sample solution by using the internal standardization with indium. In this method, complete collection of the precipitate was notrequired after the coprecipitation of iron(III), lead, and indium, because the ratio of the recovery of iron(III) or lead to that of indium was almost constant regardless of the recovery of the precipitate. This method was simple and rapid, and was available for the determination of 2 - 300 ug L^-1 of iron(III) and 5 - 400 ug L^-1 of lead in some water samples.

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