Determination of nitrate in carbon black by flow injection analysis (FIA) with potentiometric detection

• Tipo: Artigo em Revista Científica Internacional
• Data: 1997

Autores

Canal, IG (Autor) Outra; Lima, JLFC (Autor) FFUP; Montenegro, MCBSM (Autor) FFUP; PrezOlmos, R (Autor) Outra

Revista

Título: Analusis

Vol. 25

Páginas: 32-35

ISSN: 0365-4877

Editora: EDP Sciences

Indexação

ISI Web of Knowledge - 6 Citações

Scopus - 7 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-001-BTG

DOI: 10.1016/s0365-4877(97)86385-1

Abstract (EN): This paper reports the potentiometric detection of nitrate in carbon black samples by flow injection analysis (FIA). The detection system used consisted of a nitrate sensitive tubular electrode without inner reference solution, incorporating a PVC membrane with an ionic sensor based on tris(4,7-diphenyl-1,10-phenantroline) nickel(II) dissolved in 2-nitrophenyloctyl ether as the solvent mediator. According to the working characteristics of the tubular electrodes, a double channel flow injection system was constructed and optimised for direct sample analysis in a reduced time-frame. A solution of Pb(CH3COO)(2), PbO, CH3COOK and NH2SO3H was used as ionic strength and pH adjuster for both samples and standards. The tubular electrodes showed a linear response for a concentration of at least 5 10(-5) mol.L-1 with a slope of 58.3 +/- 0.9 mV/decade and a reproducibility of +/- 0.1 mV within two successive calibrations. Analysis of 10 different samples from several factories showed satisfactory results with average recoveries of about 100.5% +/- 1.5% and a variation coefficient of 1.5%. With the proposed system, a sampling rate of 120 samples/h was obtained.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 4