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1 IntroductionBecauseoftheimportanceofrareearths,asimple ,rapidandhighlysensi tivemethodfortheirdeterminationswasre quired .Theelectrochemicalstudiesformeasurementoftraceytterbiumhavebeenreported[1~ 6].Inthepreviouspaper[7]wehavereportedtheabsorptivewavea