پديدآورندگان :
MAZLOUM ARDAKANI M Department of Chemistry, Yazd University , KARIMI M. A Department of Chemistry, Ardakan Payam Noor University, Ardakan, Iran , MASHHADIZADEH M. H Department of Chemistry, Tarbiat Moalem University, Tehran , PESTEH M Department of Chemistry, Ardakan Payam Noor University, Ardakan, Iran , AZIMI M. s Department of Chemistry, Ardakan Payam Noor University, Ardakan, Iran , KAZEMIAN H Jaber Ibn Hayan Research Labs, Atomic Energy Organization of Iran, Tehran
كليدواژه :
HAsO4 2- , Zeolite , Potentiometry , Zeolite carbon-paste electrod
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.
