ANALYTICA CHIMICA ACTA, vol.575, no.1, pp.133-137, 2006 (Journal Indexed in SCI)
Article / Article
Title of Journal :
ANALYTICA CHIMICA ACTA
pre-concentration, coprecipitation, iron, lead, factorial design, SOLID-PHASE EXTRACTION, CLOUD-POINT EXTRACTION, FACTORIAL DESIGN, WATER SAMPLES, AMBERLITE XAD-4, NATURAL-WATERS, HEAVY-METALS, OPTIMIZATION, NICKEL, SYSTEM
The present paper proposes a pre-concentration procedure for determination of lead and iron in several samples by flame atomic absorption spectrometry. In it, lead(II) and iron(III) ions are coprecipitated using the violuric acid-copper(H) system as collector. Afterwards, the precipitate is dissolved with 1 M HNO3 solution and the metal ions are determined. The optimization step was performed using factorial design involving the variables: pH, violuric acid mass (VA) and copper concentration (Cu).