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Peat as a natural solid-phase for copper preconcentration and determination in a multicommuted flow system coupled to flame atomic absorption spectrometry

Gonzáles, A.P.S. ; Firmino, M.A. ; Nomura, C.S. ; Rocha, F.R.P. ; Oliveira, P.V. ; Gaubeur, I.

Analytica chimica acta, 2009-03, Vol.636 (2), p.198-204 [Periódico revisado por pares]

Amsterdam: Elsevier B.V

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Título:
Peat as a natural solid-phase for copper preconcentration and determination in a multicommuted flow system coupled to flame atomic absorption spectrometry
Autor: Gonzáles, A.P.S. ; Firmino, M.A. ; Nomura, C.S. ; Rocha, F.R.P. ; Oliveira, P.V. ; Gaubeur, I.
Assuntos: Analytical chemistry ; Chemistry ; Copper ; Copper - analysis ; Copper - isolation & purification ; Exact sciences and technology ; Flow analysis ; Hemodialysis Solutions - chemistry ; Hydrogen-Ion Concentration ; Multicommutation ; Peat ; Preconcentration ; Reproducibility of Results ; Soil ; Solvents - chemistry ; Spectrometric and optical methods ; Spectrophotometry, Atomic - instrumentation ; Spectrophotometry, Atomic - methods ; Water Pollutants, Chemical - analysis ; Water Pollutants, Chemical - isolation & purification
É parte de: Analytica chimica acta, 2009-03, Vol.636 (2), p.198-204
Notas: ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
Descrição: The physical and chemical characteristics of peat were assessed through measurement of pH, percentage of organic matter, cationic exchange capacity (CEC), elemental analysis, infrared spectroscopy and quantitative analysis of metals by ICP OES. Despite the material showed to be very acid in view of the percentage of organic matter, its CEC was significant, showing potential for retention of metal ions. This characteristic was exploited by coupling a peat mini-column to a flow system based on the multicommutation approach for the in-line copper concentration prior to flame atomic absorption spectrometric determination. Cu(II) ions were adsorbed at pH 4.5 and eluted with 0.50 mol L −1 HNO 3. The influence of chemical and hydrodynamic parameters, such as sample pH, buffer concentration, eluent type and concentration, sample flow-rate and preconcentration time were investigated. Under the optimized conditions, a linear response was observed between 16 and 100 μg L −1, with a detection limit estimated as 3 μg L −1 at the 99.7% confidence level and an enrichment factor of 16. The relative standard deviation was estimated as 3.3% ( n = 20). The mini-column was used for at least 100 sampling cycles without significant variation in the analytical response. Recoveries from copper spiked to lake water or groundwater as well as concentrates used in hemodialysis were in the 97.3–111% range. The results obtained for copper determination in these samples agreed with those achieved by graphite furnace atomic absorption spectrometry (GFAAS) at the 95% confidence level.
Editor: Amsterdam: Elsevier B.V
Idioma: Inglês

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Peat as a natural solid-phase for copper preconcentration and determination in a multicommuted flow system coupled to flame atomic absorption spectrometry

Gonzáles, A.P.S. ; Firmino, M.A. ; Nomura, C.S. ; Rocha, F.R.P. ; Oliveira, P.V. ; Gaubeur, I.

Amsterdam: Elsevier B.V

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