دانلود مقاله Preconcentration of cobalt by modified clinoptilolite with N,N′-۱,۲-cyclohexylene bis(salicylidene amine) and its determination by flame atomic absorption spectrometry
سال انتشار: ۱۳۸۷
محل انتشار: همایش بین المللی ژئولیت ایران
تعداد صفحات: ۶
h Zamani – Department of Chemistry, Faculty of Science, University of Yazd, Yazd, Iran.
h Faghihian – Department of Chemistry, University of Isfahan, Isfahan, Iran.
s dadfarnia – Department of Chemistry, Faculty of Science, University of Yazd, Yazd, Iran.
from aqueous media is proposed. The procedure is based on the adsorption of Co2+ on clinoptilolite zeolite
modified by N,N′-۱,۲-cyclohexylene bis(salicylidene amine) at pH 6. The retained cobalt on the column was
eluted with 5 ml 1 M HNO3 in ethanol and measured by flame atomic absorption spectrometry. The
influence of aqueous phase pH, type of eluent, flow rates of sample solution and eluent, volume of eluent and
the presence of other cations were envestigated. A preconcentration factor of 140 can be achieved by passing
700 ml of sample through the column. The proposed method was applied to the determination of cobalt in