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Stanovení formaldehydu kapilární izotachoforézou
Authors: Bartoš Martin | Žertová Iva
Year: 2012
Type of publication: článek ve sborníku
Name of source: Moderní elektrochemické metody XXXII
Publisher name: BEST Servis
Place: Ústí nad Labem
Page from-to: 14-18
Titles:
Language Name Abstract Keywords
cze Stanovení formaldehydu kapilární izotachoforézou Stanovení je založeno na reakci formaldehydu s amoniakem, při které vzniká urotropin. Ten je pak stanoven izotachoforeticky. Podmínky: vzorek + 0,02 mol/l NH4Cl, pH 10 (nastaveno pomocí roztoku KOH), do druhého dne nechat reagovat. Izotachoforetické stanovení: vedoucí elektrolyt: 0,01 mol/l KOH + 0,02 mol/l kyselina octová + 0,1% hydroxyethylceluloza (pH 4,75); koncový elektrolyt 0,01 mol/l kyselina octová. Linearita: 90 až 600 mg/l formaldehydu, detekční limit cca 30 mg/l. Postup byl použit ke stanovení koncentrace formaldehydu v Kutvirtově kloktadle. kapilární izotachoforéza, formaldehyd, stanovení
eng Determination of Formaldehyde using Capillary Isotachophoresis In this article, formaldehyde is determined in commercially marketed gargle. Determination is based on the reaction of formaldehyde with ammonia, when urotropine (hexamine) is formed. Optimum conditions are: sample + 0.02 mol.L-1 NH4Cl, pH 10 (adjusted by KOH solution), analysis day after using capillary isotachophoresis. The optimal isotachophoretic electrolyte system comprised 0.01 mol.L-1 KOH + 0.02 mol.L-1 acetic acid + 0.1% hydroxyethylcellulose (pH 4.75) as the leading electrolyte and 0.01 mol.L-1 acetic acid as the terminator. The calibration / detection characteristics are as follows: linearity over the concentration range of 90–600 mg.L-1 formaldehyde, limit of detection ca. 30 mg.L-1, limit of quantification of ca. 90 mg.L-1 formaldehyde. The procedure is suitable for samples containing higher amount of formaldehyde, and after proof, it is possible to use it for analysis of samples where other methods fail or a separation from interferences is necessary. Capillary isotachophoresis, Formaldehyde, Determination.

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