Especiação de cromo em cimentos e derivados de cimento brasileiros


Autoria(s): Matos,Wladiana Oliveira; Nóbrega,Joaquim Araújo
Data(s)

01/01/2009

Resumo

A method for determination of Cr(III) and Cr(VI) in cement and cement-related materials was studied. Molecular absorption spectrophotometry based on 1,5-diphenylcarbazide as chromogenic reagent was used for determination of Cr(VI) after alkaline extraction. The total chromium concentration was determined using flame atomic absorption spectrometry (FAAS) after complete sample decomposition by fusion. The quantification of Cr(III) was accomplished by subtracting the Cr(VI) concentration from the total chromium concentration. The concentration of Cr(III) in the samples ranged from 10.9 to 88.0 mg kg-1, whereas only in few samples the Cr(VI) concentration was higher than the value established by the European Community to this type of sample [2 mg kg-1 Cr(VI)].

Formato

text/html

Identificador

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422009000800020

Idioma(s)

pt

Publicador

Sociedade Brasileira de Química

Fonte

Química Nova v.32 n.8 2009

Palavras-Chave #chromium #speciation #cement
Tipo

journal article