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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Analysis of clays by inductively coupled plasma optical emission spectrometry after closed-vessel microwave-assisted acid decomposition

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Author(s):
Claudineia R. Silva [1] ; Joaquim A. Nóbrega [2] ; Telma Blanco [3]
Total Authors: 3
Affiliation:
[1] Universidade de São Paulo. Instituto de Química de São Carlos
[2] Universidade Federal de São Carlos. Departamento de Química
[3] Universidade Federal de São Carlos. Centro de Caracterização e Desenvolvimento de Materiais
Total Affiliations: 3
Document type: Journal article
Source: Química Nova; v. 28, n. 1, p. 137-140, 2005-02-00.
Abstract

In this work a closed-vessel microwave-assisted acid decomposition procedure for clays was developed. Aluminum, Ca, Fe, K, Mg, Na, Si, and Ti were determined in clay digestates by inductively coupled plasma optical emission spectrometry. The most critical parameter for total decomposition of clays was the composition of the reagent mixture. The applied power and the heating time exerted a less critical influence. Best decomposition conditions were attained using a reagent mixture containing 4 mL aqua regia plus 3 mL HF and the heating program was implemented in 12 min. The accuracy of the results was demonstrated using two standard reference materials and a paired t-test showed a good agreement between determined and certified values at a 95% confidence level. (AU)