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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Use of a Digital Image in Flow Analysis: Determination of Nitrite and Nitrate in Natural Waters

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Autor(es):
Santos, Jorge Luis O. [1] ; Leite, Oldair D. [2] ; Vieira, Anete D. M. [2] ; Jesus, Djane S. [3] ; Kamogawa, Marcos Y. [4]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Fed Bahia, Inst Quim, Salvador, BA - Brazil
[2] Univ Fed Oeste Bahia, Barreiras, BA - Brazil
[3] Inst Fed Educ Ciencia & Tecnol Bahia, Salvador, BA - Brazil
[4] Univ Sao Paulo, Escola Super Agr Luiz de Queiroz, Piracicaba, SP - Brazil
Número total de Afiliações: 4
Tipo de documento: Artigo Científico
Fonte: Journal of the Brazilian Chemical Society; v. 27, n. 1, p. 70-76, JAN 2016.
Citações Web of Science: 7
Resumo

A webcam is proposed as the detector in a flow system with multicommutation, and the feasibility of the approach is demonstrated in the determination of nitrate and nitrite in natural waters. The typical transient signal inherent to the flow system was obtained using a digital video and quantified by ImageJ software. The linear dynamics range for nitrite and nitrate determinations were 0.2 to 2.0 mg L-1 NO2- and 1.0 to 10.0 mg L-1 NO3-, with relative standard deviation <2% for both analytes. The limits of detection were 0.01 and 0.04 mg L-1 for nitrite for nitrate, respectively, and the sampling rate were 80 and 103 h(-1) for nitrite and nitrate, respectively. The use of webcams has a high potential for analysis in the visible region of the electromagnetic spectrum, and the proposed strategy constitutes a promising alternative to traditional absorbance measurements that depend on conventional equipment. The webcam detection system is attractive, especially in relation to field analysis. (AU)

Processo FAPESP: 05/00878-0 - Imagens digitais: análise química qualitativa e/ou quantitativa
Beneficiário:Marcos Yassuo Kamogawa
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 11/23498-9 - Sistemas avançados de análises químicas em fluxo: aplicações nas áreas tecnológica, agronômica e ambiental
Beneficiário:Elias Ayres Guidetti Zagatto
Linha de fomento: Auxílio à Pesquisa - Temático