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

2002; Brazilian Chemical Society; Volume: 25; Issue: 3 Linguagem: Inglês

10.1590/s0100-40422002000300003

1678-7064

Cássia Ugucione, José de Anchieta Gomes Neto, Arnaldo Alves Cardoso,

Analytical chemistry methods development

ATMOSPHERIC NITROGEN DIOXIDE USING PRECONCENTRATION ON C-18 CARTRIDGE.An alternative analytical method for nitrogen dioxide (NO 2 ) in atmosphere was developed.The collection of NO 2 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, NO 2 is collected with good repeatibility (CV = 3,3 %).The NO 2 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.