TUBULAR DETECTORS FOR FLOW-INJECTION POTENTIOMETRIC DETERMINATION OF TETRAFLUOROBORATE IN ELECTROPLATING BATHS

• Tipo: Artigo em Revista Científica Internacional
• Data: 1994

Autores

ARAUJO, AN (Autor) FFUP; ETXEBARRIA, MB (Autor) Outra; LIMA, JLFC (Autor) FFUP; MONTENEGRO, MCBSM (Autor) FFUP; OLMOS, RP (Autor) Outra

Revista

Título: Analytica Chimica Acta

Vol. 293

Páginas: 35-41

ISSN: 0003-2670

Editora: Elsevier

Indexação

ISI Web of Knowledge - 6 Citações

Scopus - 8 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-001-JV9

DOI: 10.1016/0003-2670(94)00073-5

Abstract (EN): PVC tetrafluoroborate tubular electrodes without an inner reference solution, based on tetraoctylammonium as the ion exchanger and 2-nitrophenyloctyl ether as the mediator solvent, were constructed. The general operating characteristics of the tubular detectors were evaluated by a single line flow-injection system with low sample dispersion and compared to those of corresponding conventionally-shaped electrodes, determined in batch conditions. In flow-injection analysis (FIA), the detector response was linear in the concentration range between 4 X 10(-6) and 10(-1) M, with a mean slope of 59.2 +/- 0.9 mV/dec in the pH range between of 2.7 and 11.5. The reproducibility of the detector potentials was approximately 0.2 mV during a day of continuous operation. The membrane used showed a high degree of selectivity. The tubular detectors remained operational over a long period of time (approximately 36 months) and had a response time that enabled a sampling rate of 360 h(-1). The electrodes were later used in the determination of tetrafluoroborate in concentrated electrolytic baths for which a high dispersion FIA system was developed. The analyses of seven baths with different compositions presented results with mean recovery values of 98.8% with a coefficient variation of 1.9%.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7