Determination of nickel in fuel ethanol using a carbon paste modified electrode containing dimethylglyoxime

被引：21
|
作者：
Oliveira Tartarotti, Fernando
Firmino de Oliveira, Marcelo [1 ]
Roberto Balbo, Valdir
Ramos Stradiotto, Nelson
机构：
[1] Univ Estadual Paulista, Fac Ciencias, UNESP, BR-17033360 Bauru, SP, Brazil
[2] Univ Estadual Paulista, Inst Quim, UNESP, BR-14800900 Araraquara, SP, Brazil
来源：
MICROCHIMICA ACTA | 2006年 / 155卷 / 3-4期
关键词：
nickel; fuel ethanol; chemically modified electrode; dimethylglyoxime; differential pulse voltammetry;
D O I：
10.1007/s00604-006-0638-2
中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
A mercury-free electrode chemically modified with carbon paste containing dimethylglyoxime was used for determination of nickel in fuel ethanol. The instrumental parameters and composition of the modified paste were optimized. The analytical curve for nickel determination from 5.0 x 10(-9) to 5.0 x10(-7) mol(-1) was obtained using 25 min of accumulation time. The detection limit and amperometric sensitivity obtained for this method were 2.7 x 10 mol(-1) and 5.2 x 10(8) mu A mol(-1) L, respectively. The values for nickel concentration in four commercial samples of fuel ethanol were obtained in the range of 1.1 x 10(-8) to 6.9 x 10(-8) mol(-1). A comparison to graphite furnace atomic absorption spectrometry (GFAAS) was performed for nickel determination in commercial samples of ethanol.
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页码：397 / 401
页数：5
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