Método colorimétrico para determinação de dióxido de nitrogênio atmosférico com preconcentração em coluna de c-18
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Data
2002-05-01
Autores
Ugucione, Cássia [UNESP]
Gomes Neto, José de Anchieta [UNESP]
Cardoso, Arnaldo Alves [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Química
Resumo
An alternative analytical method for nitrogen dioxide (NO2) in atmosphere was developed. The collection of NO2 is performed by a Sep-Pack C-18 cartridge impregnated with 11% (v/v) of triethanolamine 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 NO2 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
Química Nova. Sociedade Brasileira de Química, v. 25, n. 3, p. 352-357, 2002.