Determination of trace metals in natural waters by flame atomic absorption spectrometry following on-line ion-exchange preconcentration

• Published in: Analytica chimica acta Vol. 303; no. 2; pp. 341 - 345
• Main Authors: Yebra-Biurrun, M.C., Bermejo-Barrera, A., Bermejo-Barrera, M.P., Barciela-Alonso, M.C.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 10.03.1995; Elsevier
• Subjects: Analytical chemistry; Atomic absorption spectrometry; Chemistry; Exact sciences and technology; Flow injection; PAPhA resin; Preconcentration; Spectrometric and optical methods; Trace metals; Waters; Preconcentration; PAPhA resin; Waters; Trace metals; Atomic absorption spectrometry; Flow injection; Trace analysis; Water; Chemical analysis; Metal; Ion exchange; Chemical enrichment
• ISSN: 0003-2670; 1873-4324
• DOI: 10.1016/0003-2670(94)00509-K

An on-line column preconcentration technique for flow-injection flame atomic absorption spectrometry has been developed for the determination of trace metals in natural waters. A minicolumn (20 mm × 2 mm i.d.) filled with a poly(aminophosphonic acid) chelating resin (PAPhA, 20–30 mesh) was used for the preconcentration procedure. For 2 ml samples, detection limits of 0.5, 5.0, 1.5, 1.6, 3.5, 0.6, 3.2, 3.1 and 0.4 μg 1 −1 for Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb and Zn, respectively, were achieved. The precision (coefficient of variation) obtained was in the range between 1.1 (Cd and Cu) and 3.3% (Co). Accuracy was also investigated and results agreed with the certified values of the reference material. The sampling rate was 48 h −1. The method was applied to the determination of trace metals in natural waters samples from Galicia (Spain).