Determinação de dioxido de carbono por titulação potenciométrica (Gran) após absorção em hidróxido de sódio / Determination of carbon dioxide by potenciometric titration (GRAN) after absorption in sodium hydroxide

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

21/03/1989

RESUMO

This work deals with the development of a simple and low cost methodology the determination of carbonic gas in the atmosphere. The CO2 is absorved in aqueous solution of NaOH 10-4; M and, to t he resulting solution, NaCl is added to a concentratian of 1.0M and the potentiometric titration is done with HCl 10-3; M solution. To avoid the interference of carbonate ions in the original NaOH solution, an aliquot of the NaOH solution is previously titrated just before the absorption af CO2; this previous titration is the \"blank\". The final solulion of NaOH and carbonate ions is titrated and one measures the diference of the volume at the end point of the \"blank\" and the sample itself. The is made by Gran II method according to Pressinotti (9). Studies about introdution of CO2 in the solution of NaOH were made.The following methods were studied: a - by mixer bomb; b - by the cylindrical vessel bubble absorber; c - by the use of syringe injection. This last one showed to be extremaly simple and of low cost.

ASSUNTO(S)

carbon dioxide dióxido de carbono (análise) environmental chemistry gran gran potenciometric titration química ambiental titulação potenciometrica

ACESSO AO ARTIGO

Documentos Relacionados