سال انتشار: ۱۳۸۷

محل انتشار: همایش بین المللی ژئولیت ایران

تعداد صفحات: ۹

نویسنده(ها):

M MAZLOUM ARDAKANI – Faculty of Science, Department of Chemistry, Yazd University, Yazd, Iran
M.A KARIMI – Department of Chemistry, Ardakan Payam Noor University, Ardakan, Iran
M.H MASHHADIZADEH – Faculty of Science, Department of Chemistry, Tarbiat Moalem University, Tehran, Iran
M PESTEH – Department of Chemistry, Ardakan Payam Noor University, Ardakan, Iran

چکیده:

A new carbon-paste electrode, based on natural zeolite (c1inoptiolite) modified by the Fe2+ ion as carrier,
was developed. The electrode exhibits a linear response to monohydrogen arsenate over a wide concentration
range (5.0 x 10-8-1.0 x 10-3M) with a Nernstian slope of -28.3±۱٫۰mV per decade (r2=0.9998). The limit of
detection was 3.0x 10-8 M. It has a fast response time 5-10 s and can be used for more than 2 months.
Selectivity coefficients determined by the fixed interference method indicate that a good discriminating
ability towards mono hydrogen arsenate ion in comparison with other anions. The monohydrogen arsenateselective
electrode could be used in the pH range of 7.0-11.0. This chemically modified carbon-paste
electrode was successfully used for the determination of arsenic in water and wastewater samples.