Determination of manganese by flame atomic absorption spectrometry after its adsorption onto naphthalene modified with 1-(2-pyridylazo)-2-naphthol (PAN)

被引:54
作者
dos Anjos, Aparecida P.
Cornejo-Ponce, Lorena
Cadore, Solange
Baccan, Nivaldo
机构
[1] Univ Estadual Campinas, Inst Quim, BR-13083970 Campinas, SP, Brazil
[2] Univ de Tarapaca, Dept de Quimica, Arica, Chile
关键词
manganese; solid-phase extraction; PAN; naphthalene; FAAS;
D O I
10.1016/j.talanta.2006.06.026
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A system for determination of manganese, after preconcentration with 3% (w/w) 1-(2-pyridylazo)-2-naphthol (PAN), adsorbed on microcrystalline naphthalene is proposed. An amount of 200 mg of this complexing mixture is placed in a glass column and conditioned with a NH4Cl/NH4OH buffer solution (pH 9.5). The aqueous sample, containing manganese, is treated with an ammonium tartrate solution, then with a hydroxylammonium chloride solution and, finally, with a buffer solution. The resulting solution is passed through the column containing microcrystalline naphthalene modified with 1-(2-pyridylazo)-2-naphthol (PAN) where Mn(II) is retained. The column is first washed with deionized water and then with 10.0 ml of dimethylformamide to dissolve the Mn(II)-PAN/naphthalene complex. Manganese is determined by air-acetylene flame atomic absorption spectrometry. About 1 mu g of manganese can be concentrated from 200 ml of aqueous sample, allowing a preconcentration factor of 20, a limit of quantification of 5 ng ml(-1) and R.S.D. of 3.8%. The accuracy was ascertained using certified reference materials, including samples of urine and glass. Water samples were also analysed and the results are in good agreement with those obtained by graphite furnace atomic absorption spectrometry. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:1252 / 1256
页数:5
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