Adsorption voltammetric determination of mu g l(-1) levels formaldehyde via in situ derivatization with Girard's reagent T

被引：27

作者：

Chan, WH ^{[1
]}

Xie, TY ^{[1
]}

机构：

[1] ZHONGSHAN UNIV,DEPT CHEM,GUANGZHOU 510275,PEOPLES R CHINA

来源：

ANALYTICA CHIMICA ACTA | 1997年 / 339卷 / 1-2期

关键词：

voltammetry; formaldehyde; organic analysis; Girard's reagent T;

D O I：

10.1016/S0003-2670(96)00460-6

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The adsorptive voltammetric behaviour of formaldehyde (HCHO) after its in situ derivatization with trimethylaminoacetohydrazide chloride (Girard's reagent T) at a hanging mercury drop electrode (HMDE) was investigated in NH3-NH4Cl (pH 9.7) solution. The results showed that the adduct of HCHO with Girard's reagent T can be adsorbed on the surface of the HMDE, yielding one peak at -1280 mV (vs Ag/AgCl electrode), corresponding to the reduction of the adduct. The limit of detection was as low as 8.0x10(-8) mol dm(-3) (corresponding to 2.4 mu g dm(-3) of HCHO). The linear range of the method was 2.0x10(-7)similar to 8.0x10(-6) mol dm(-3). The sensitivity of the method allows its application for the direct determination of HCHO in rain water samples.

引用

页码：173 / 179

页数：7

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