Decomposição de argilas em forno de microondas e determinação simultânea dos seus constituintes principais por espectrometria de emissão óptica em plasma indutivamente acoplado

Autor:	Joaquim A. Nóbrega, Telma Blanco, Claudineia R. Silva
Přispěvatelé:	Universidade de São Paulo (USP), Universidade Federal de São Carlos (UFSCar), Universidade Estadual Paulista (Unesp)
Rok vydání:	2005
Předmět:	Chemistry Analytical chemistry General Chemistry complex mixtures Decomposition ICPOES chemistry.chemical_compound Critical parameter Reagent Aqua regia clays Inductively coupled plasma Optical emission spectrometry Heating time microwave-assisted decomposition
Zdroj:	Web of Science Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP
ISSN:	0100-4042
Popis:	Submitted by Guilherme Lemeszenski (guilherme@nead.unesp.br) on 2014-02-26T17:21:12Z No. of bitstreams: 1 WOS000226933200023.pdf: 56781 bytes, checksum: ace7e73ba1de02dd9c42a083dc87c997 (MD5) Made available in DSpace on 2014-02-26T17:21:12Z (GMT). No. of bitstreams: 1 WOS000226933200023.pdf: 56781 bytes, checksum: ace7e73ba1de02dd9c42a083dc87c997 (MD5) Previous issue date: 2005-01-01 Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-20T15:29:07Z No. of bitstreams: 1 WOS000226933200023.pdf: 56781 bytes, checksum: ace7e73ba1de02dd9c42a083dc87c997 (MD5) Made available in DSpace on 2014-05-20T15:29:07Z (GMT). No. of bitstreams: 1 WOS000226933200023.pdf: 56781 bytes, checksum: ace7e73ba1de02dd9c42a083dc87c997 (MD5) Previous issue date: 2005-01-01 ANALYSIS OF CLAYS BY INDUCTIVELY COUPLED PLASMA OPTICAL EMISSION SPECTROMETRY AFTER CLOSED-VESSEL MICROWAVE-ASSISTED ACID DECOMPOSITION. 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. Univ São Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil Univ Fed Sao Carlos, Dept Quim, BR-13560970 Sao Carlos, SP, Brazil Univ Estadual Paulista, Univ Fed Sao Carlos, Ctr Caracteriazcao & Desenvolvimento Mat, BR-13560970 Sao Carlos, SP, Brazil Univ Estadual Paulista, Univ Fed Sao Carlos, Ctr Caracteriazcao & Desenvolvimento Mat, BR-13560970 Sao Carlos, SP, Brazil
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4fbaef13e73054763ab140ea6eefa600 https://doi.org/10.1590/s0100-40422005000100023 Zobrazit plný text záznamu