Cloud point extraction (CPE) was applied as a preconcentration step prior to graphite furnace atomic absorption spectrometry (GFAAS) determination
of manganese(II) and iron(III) in water samples. After complexation with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP), the
analytes could be quantitatively extracted to the phase rich in the surfactant p-octylpolyethyleneglycolphenylether (Triton X-100) and be concentrated,
then determined by GFAAS. The parameters affecting the extraction efficiency, such as solution pH, concentration of PMBP and Triton
X-100, equilibration temperature and time, were investigated in detail. Under the optimum conditions, preconcentration of 10 ml of sample solution
permitted the detection of 0.02 ngml−1 of Mn(II) and 0.08 ngml−1 of Fe(III) with enrichment factors of 31 and 25 for Mn(II) and Fe(III),
respectively. The proposed method was applied to determination of trace manganese(II) and iron(III) in water samples with satisfactory results.
© 2006 Elsevier Inc. All rights reserved.
Cloud point extraction (CPE) was applied as a preconcentration step prior to graphite furnace atomic absorption spectrometry (GFAAS) determinationof manganese(II) and iron(III) in water samples. After complexation with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP), theanalytes could be quantitatively extracted to the phase rich in the surfactant p-octylpolyethyleneglycolphenylether (Triton X-100) and be concentrated,then determined by GFAAS. The parameters affecting the extraction efficiency, such as solution pH, concentration of PMBP and TritonX-100, equilibration temperature and time, were investigated in detail. Under the optimum conditions, preconcentration of 10 ml of sample solutionpermitted the detection of 0.02 ngml−1 of Mn(II) and 0.08 ngml−1 of Fe(III) with enrichment factors of 31 and 25 for Mn(II) and Fe(III),respectively. The proposed method was applied to determination of trace manganese(II) and iron(III) in water samples with satisfactory results.© 2006 Elsevier Inc. All rights reserved.
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