New Pb2+ Carbon Paste Electrode based on Organically Modified Silicate and its Square Wave Anodic Stripping Voltammetric Response for Pretreated Gasoline Samples

被引：9

作者：

Cardoso, William S. ^{[4
]}

Oliveira da Fonseca, Teresa Cristina ^{[3
]}

Marques, Aldalea L. B. ^{[2
]}

Marques, Edmar P. ^{[1
]}

机构：

[1] Univ Fed Maranhao, Dept Quim, BR-65085580 Sao Luis, MA, Brazil

[2] Univ Fed Maranhao, Dept Quim Tecnol, BR-65085580 Sao Luis, MA, Brazil

[3] Petrobras SA, CENPES, Ctr Pesquisas & Desenvolvimento Leopoldo Amer Mig, BR-21941915 Rio De Janeiro, Brazil

[4] Univ Estadual Maranhao, Dept Quim & Biol, BR-65055970 Sao Luis, MA, Brazil

来源：

JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY | 2010年 / 21卷 / 09期

关键词：

inorganic-organic hybrid; lead determination; stripping voltammetry; carbon paste electrode; HYBRID MEMBRANES; SULFURIC-ACID; SOILS; 3-AMINOPROPYLTRIETHOXYSILANE; COPPER(II); LEAD(II); SURFACE; FILMS;

D O I：

10.1590/S0103-50532010000900020

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

An analytical procedure for determining Pb2+ by square wave anodic stripping voltammetry in pretreated gasoline sample is described and a carbon paste electrode modified with a inorganic-organic hybrid material (aminopropyl linked to the silica network (APSil) obtained by the sol-gel method) was evaluated as an electrochemical sensor. The optimum conditions for the analysis of Pb2+ ions were presented as follows: composition of APSil on the carbon paste electrode 40% (wt.%); deposition solution of pH 1.8; accumulation potential of -0.7 V vs. Ag/AgCl and deposition time of 600 s. Interference studies indicated that only Cu2+, at a 5-fold excess, interfered drastically on the stripping response of Pb2+.

引用

页码：1733 / 1738

页数：6

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