PLANEJAMENTO FATORIAL E SUPERFICIE DE RESPOSTA: OTIMIZACAO DE UM METODO VOITAMETRICO PARA A DETERMINACAO DE Ag(I) EMPREGANDO UM ELETRODO DE PASTA DE NA NOTUBOS DE CARBONO

摘要

A factorial design applied in a voltammetric stripping method for the measurement of AO) in natural water is described. The procedure is based on the effective pre-concentration of silver ions on electrode surface. The calibration graph was linear in the silver concentration range from 7.92 x 10~(-2) to 1.07 x 10~(-5) mol L~(-1)with a detection limit of 3.81 x 10~(-7) mol L~(-1)The determination of Ag(I) in natural water samples was carried out satisfactory with the proposed electrode.