Preconcentration and determination of Cu(II) in a fresh water sample using modified silica gel as a solid-phase extraction adsorbent

A method was developed to attach 4-amino-2-mercaptopyrimidine (AMP) onto silica gel surface and to determine trace metals. The surface functionalization reaction was performed with a silylant agent, chloropropyltrimethoxysilane (Si-CPTS), and the product, Si-AMP, was characterized by FT-IR and eleme...

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Bibliographic Details
Published in:Journal of hazardous materials 2010-03, Vol.175 (1), p.399-403
Main Authors: Pereira, A.S., Ferreira, G., Caetano, L., Martines, M.A.U., Padilha, P.M., Santos, A., Castro, G.R.
Format: Article
Language:English
Subjects:
Adsorption
Applied sciences
Aqueous medium
Chemical engineering
Continental surface waters
Copper
Copper - chemistry
Exact sciences and technology
Gels
Ions
Kinetics
Ligands
Modified silica
Natural water pollution
Pollution
Preconcentration
Pyrimidines - chemistry
Silicon Dioxide - chemistry
Solid Phase Extraction - methods
Spectrophotometry, Atomic - methods
Spectroscopy, Fourier Transform Infrared - methods
Sulfhydryl Compounds - chemistry
Water Pollutants, Chemical - chemistry
Water Pollutants, Chemical - isolation & purification
Water Purification - methods
Water treatment and pollution
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Summary:A method was developed to attach 4-amino-2-mercaptopyrimidine (AMP) onto silica gel surface and to determine trace metals. The surface functionalization reaction was performed with a silylant agent, chloropropyltrimethoxysilane (Si-CPTS), and the product, Si-AMP, was characterized by FT-IR and elemental analysis to evaluate the surface modification. The functionalized silica was applied in the sorption of Cu(II) ions from an aqueous medium. The series of adsorption isotherms were adjusted to a modified Langmuir equation and the maximum number of moles of adsorbed copper was 0.447 mmol g −1. The modified material was placed in a preconcentration system, where it reached an approximately 20-fold enrichment factor using 5 mg of Si-AMP. The proposed method was applied in the preconcentration and determination of Cu(II) in a fresh water sample from the Paraná river and was validated through a comparative analysis of a standard reference material (1643e).
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2009.10.018