Abstract
A method has been developed for the determination of traces of metal ions in aqueous system by solvent extraction with monooctyl ester α-(2-carboxyanilino)benzylphosphonic acid -methylisobutyl ketone followed by flame-atomic absorption spectrophotometry. The extraction properties of the chelating agent as well as the conditions for the determination were studied in detail. Experimental date have shown that in the pH range 4.5–5.5 a single extraction provides transfer of more than 99% of Cr(III), Mn(II), Fe(III), Co(II), Ni(II), Cu(II) and Zn(II) into the organic phase. Mn(VII) is reduced and is extracted as Mn(II). Cr(VI) is only partly extracted at pH < 2.5. The metal content of organic-extracts is directly measured by AAS. Flame composition, detection limits, sensitivities and range of linear calibration graphs are given. In samples of environmental waters recoveries of 93–106% and r.s.d. of 1–5 % were obtained.
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