Colorimetric determination of atmospheric nitrogen dioxide using preconcentration on C-18 cartridge.

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Data

2002-05-01

Autores

Ugucione, C.
Neto, J. D.
Cardoso, A. A.

Título da Revista

ISSN da Revista

Título de Volume

Editor

Soc Brasileira Quimica

Resumo

COLORIMETRIC DETERMINATION OF ATMOSPHERIC NITROGEN DIOXIDE USING PRECONCENTRATION ON C-18 CARTRIDGE, An alternative analytical method for nitrogen dioxide (NO,) in atmosphere was developed. The collection of NO, is performed by a Sep-Pack C-18 cartridge impregnated with 11 % (v/v) of triethanolaminc plus 3,6 % (v/v) of ethylene glycol plus 25 % (v/v) of acetone combined solution. When the impregnating is used, NO2 is collected with good repeatibility (CV 3,3 %). The NO, absorbed in the sampler was stripped from the sorbent with a methanol 5% (v/v) aqueous solution and was determined by colorimetry as nitrite by using the Griess-Saltzman reagent. The detection limit of 1,4 ppb for 60 min sampling at 0,5 L min(-1) flow rate was obtained. Preparation and conditioning procedures for TEA-C-18 cartridge, sampling flow rate, absorption capacity and interference of other species are discussed.

Descrição

Palavras-chave

nitrogen dioxide, triethanolamine, Griess Saltzman reagent

Como citar

Quimica Nova. Sao Paulo: Soc Brasileira Quimica, v. 25, n. 3, p. 353-357, 2002.