شماره ركورد كنفرانس :
3306
عنوان مقاله :
Potentiometric determination of monohydrogen arsenate by zeolite-modified carbon-paste electrode
Author/Authors :
M. MAZLOUM ARDAKANI Faculty of Science - Department of Chemistry - Yazd University , M. A. KARIMI Department of Chemistry - Ardakan Payam Noor University , M. H. MASHHADIZADEH Department of Chemistry - Ardakan Payam Noor University , M. PESTEH Department of Chemistry - Ardakan Payam Noor University , M. s. AZIMI Department of Chemistry - Ardakan Payam Noor University , H. KAZEMIAN Atomic Energy Organization of Iran, Tehran
كليدواژه :
HAsO4 2 , Zeolite , Potentiometry , Zeolite carbon-paste electrode
عنوان كنفرانس :
كنفرانس بين المللي زئوليت ايران
چكيده لاتين :
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±1.0mV 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.
