Molybdenum determination in iron matrices by ICP-AES after separation and preconcentration using polyurethane foam

Autor: Sergio Luis Costa Ferreira, Hilda Costa dos Santos, Djane Santiago de Jesus
Rok vydání: 2001
Předmět:
Zdroj: Scopus-Elsevier
Repositório Institucional da UFBA
Universidade Federal da Bahia (UFBA)
instacron:UFBA
ISSN: 1432-1130
0937-0633
DOI: 10.1007/s002160000590
Popis: Texto completo: acesso restrito. p. 187-190 Submitted by Suelen Reis (suelen_suzane@hotmail.com) on 2013-01-07T15:12:13Z No. of bitstreams: 1 Ferreira.pdf: 29396 bytes, checksum: 98a9c0d493bacef847534e56b0fb01f9 (MD5) Made available in DSpace on 2013-01-07T15:12:13Z (GMT). No. of bitstreams: 1 Ferreira.pdf: 29396 bytes, checksum: 98a9c0d493bacef847534e56b0fb01f9 (MD5) Previous issue date: 2001 A procedure is proposed for the separation and determination of molybdenum in iron matrices by a batch process. It is based on the solid-phase extraction of the molybdenum(V) ion as thiocyanate complex on polyurethane (PU) foam. The extraction parameters were optimized. Using 0.20 mol L–1 hydrochloric acid, a thiocyanate concentration of 0.10 mol L–1, 100 mg of polyurethane foam and shaking time of 10 min, molybdenum (5–400 μg) can be separated and preconcentrated from large amounts of iron (10 mg). Desorption was carried out instantaneously by conc. nitric acid or acetone. Distribution coefficients, sorption capacity of the PU foam and coefficients of variation were also evaluated. The effect of some ions on the separation procedure was assessed. Iron(III) should be reduced to iron(II). The proposed procedure was used to determine molybdenum in standard iron matrices such as steel and pure iron. The achieved results did not show significant differences with certified values.
Databáze: OpenAIRE
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