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Development of a chemically modified electrode based on carbon paste and functionalized silica gel for preconcentration and voltammetric determination of mercury(II)

✍ Scribed by L.M. Aleixo; M. de F'atima; B. Souza; O.E.S. Godinho; G. de Oliveira Neto; Y. Gushikem; José C. Moreira

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
432 KB
Volume
271
Category
Article
ISSN
0003-2670

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✦ Synopsis

Ahstraet

A mercury-sensltlve chermcally modlfied electrode (CME) based on modtfied sd~ca gel-contauung carbon paste was developed The functional group attached to the slhca gel surface was 3-(2-th~obenxunldazolyl)propyl, whrch IS able to complex mercury ions This electrode was apphed to the detenmnatlon of mercudI1) Ions m aqueous solution The mercury was chenucally preconcentrated on the CME prior to voltammetnc determmahon by amxhc stnppmg m the dlfferentlal-pulse mode A cahbratlon graph covermg the concentration range from 0 08 to 2 mg 1-l was constructed The preclslon for SIX detenmnatlons of 0 122 and 0 312 mg I-' Hg(II) was 3 2 and 2.9% (relatwe standard dewatlon), respectwely The detection hmit for a 5-mm preconcentratlon penod was 0 013 mg I-' A study for foreign ions was also made Keywords Voltammetry, Carbon paste electrodes, Chemically moddied electrodes, Functlonahzed slhca gel, Mercury, Preconcentrafion

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