Método colorimétrico para determinação de dióxido de nitrogênio atmosférico com preconcentração em coluna de c-18

Química Nova

Cássia Ugucione¹  José De Anchieta Gomes Neto¹  Arnaldo Alves Cardoso¹ 

[1] ,Universidade Estadual Paulista Júlio de Mesquita Filho Instituto de Química de Araraquara Departamento de Química AnalíticaAraraquara SP

关键词: nitrogen dioxide;    triethanolamine;    Griess Saltzman reagent;   

DOI  :  10.1590/S0100-40422002000300003

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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