Método colorimétrico para determinação de dióxido de nitrogênio atmosférico com preconcentração em coluna de c-18
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Coadvisor
Graduate program
Undergraduate course
Journal Title
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Volume Title
Publisher
Sociedade Brasileira de Química
Type
Article
Access right
Acesso aberto
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Abstract
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.
Description
Keywords
nitrogen dioxide, triethanolamine, Griess Saltzman reagent
Language
Portuguese
Citation
Química Nova. Sociedade Brasileira de Química, v. 25, n. 3, p. 352-357, 2002.
