Colorimetric determination of sulfur dioxide in air using a droplet collector of malachite green solution


Autoria(s): Milani, M. R.; Neto, JAC; Cardoso, Arnaldo Alves
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

20/05/2014

20/05/2014

01/06/1999

Resumo

The measurement of sulfur dioxide in air at the parts-per-billion level is described. The experimental arrangement consists of two optical fibers placed on opposite sides of a liquid droplet of malachite green solution. After light has been passed through the droplet, the transmitted light is measured by a referenced photodetection arrangement. The light used in this absorption process is from a monochromatic source (lambda(max) 625 nm). This arrangement permits the variation of color in the droplet to be measured. The sulfur dioxide in the sample is collected by the droplet; it reacts with malachite green resulting in a colorless dye. The decoloration of the solution is proportional to the concentration of sulfur dioxide sampled. The signal depends on the sample flow rate. The present technique is simple, inexpensive, and permits a fast and near real time measurement while consuming very little reagent, (C) 1999 Academic Press.

Formato

273-281

Identificador

http://dx.doi.org/10.1006/mchj.1999.1729

Microchemical Journal. San Diego: Academic Press Inc., v. 62, n. 2, p. 273-281, 1999.

0026-265X

http://hdl.handle.net/11449/36432

10.1006/mchj.1999.1729

WOS:000080621800008

Idioma(s)

eng

Publicador

Academic Press Inc.

Relação

Microchemical Journal

Direitos

closedAccess

Palavras-Chave #sulfur dioxide #droplet sensor #colorimetry #air analysis
Tipo

info:eu-repo/semantics/article