Data/hora: 06/06/2024 03:48:58

Biblioteca(s): 	Embrapa Pecuária Sudeste.	
Tipo da produção científica: 	Artigo em Periódico Indexado	
Circulação/Nível: 	B - 1	
Data corrente: 	26/02/2018	
Data da última atualização: 	13/11/2018	
Autoria: 	SANTOS, C. S. da; SOUZA, G. B. de; NOGUEIRA, A. R. de A.	
Afiliação: 	Caroline Santos da Silva, UFSCar; GILBERTO BATISTA DE SOUZA, CPPSE; ANA RITA DE ARAUJO NOGUEIRA, CPPSE.	
Título: 	Preparation and characterization of phosphate rock as quality control material.	
Ano de publicação: 	2018	
Fonte/Imprenta: 	Accreditation and Quality Assurance, v.23, p.39-45, 2018.	
DOI: 	https://doi.org/10.1007/s00769-017-1295-3	
Idioma: 	Inglês	
Conteúdo: 	A quality control material for inorganic constituents present in a phosphate-bearing rock used to manufacture phosphate fertilizers was produced and characterized according to the ISO Guide 80. The evaluation of the estimated minimum mass, homogeneity, and stability of the material was performed using microwave-assisted digestion and inductively coupled plasma optical emission spectrometry (ICP-OES) as an in-house validated technique for determination of Al, As, Ca, Cd, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, V, and Zn. Phosphorus mass fraction determination was done by laser-induced breakdown spectroscopy. The accuracy of the measurement results was confirmed by analyzing the certified phosphate rock and fertilizer certified reference materials according to NIST SRM 694 and SRM 695. One-way analysis of variance (ANOVA) was applied to the measurement data, and the homogeneity and stability of the material presented averages within the 95 % confidence interval. The results from the preparation and with collaborative trial allowed the calculation and estimation of the consensus value and its expanded measurement uncertainties, obtained by combining the uncertainty contributions from characterization (uchar), between-bottle homogeneity (ubb), short-term stability (usts), and long-term stability (ults) for each evaluated analyte mass fraction.	
Palavras-Chave: 	Análises de variância; ICP-OES; Incerteza; Material de controle de qualidade.	
Thesagro: 	Rocha fosfatada.	
Thesaurus Nal: 	Rock phosphate.	
Categoria do assunto: 	W Química e Física	
Registro original: 	Embrapa Pecuária Sudeste (CPPSE)	
Exemplares: 	CPPSE - (24341-1) - UPC - AP - DD - PROCI-2018.00013 - SIL - 2018.00016 - DIS