Fabrication of new carbon paste electrodes based on gold nano-particles self-assembled to mercapto compounds as suitable ionophores for potentiometricdetermination of Copper ions

سال انتشار: 1393
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 505

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تاریخ نمایه سازی: 18 تیر 1394

چکیده مقاله:

In the present study, we investigate the potentiometric behavior of Cu2+ carbon paste electrodes based on two mercapto compounds 2-Ethylmino-5-Mercapto-1,3,4-Thiadiazole (EAMT) and 2- Acetylamino-5-mercapto-1,3,4-thiadiazole (AAMT) self-assembled on gold nano-paricle (GNP) as ionophore. Then, the obtained results from the modified electrodes are compared. The selfassembled ionophores exhibit a high selectivity for Copper ion (Cu2+),in which the sulfur and nitrogen atoms in their structure play a significant role as the effective coordination donor site forthe Copper ion. Among these electrodes, the best performance was obtained with the sensor with a EAMT/graphite powder/paraffin oil weight ratio of 4.0/68/28 with 200 μL of GNP which exhibits the working concentration range of 1.6×10^−9 to 6.3×10^−2 M and a Nernstian slope of 28.9±0.4 mVdecade^−1 of copper (II) activity. The detection limit of electrode was2.9(±0.2)×10^−10M and potential response was pH , in other words, it was independent across the range of 2.8–6.3. The proposed electrode presented very good selectivity and sensitivity towards the Cu2+ ions over a wide variety of cations including alkali, alkaline earth, transition and heavy metal ions. Moreover, the proposed electrode was successfully applied as an indicator electrode in the potentiometric titration of Cu (II) ions with EDTA and also the potentiometric determination of copper ions in spiked water samples.


Rasoul Pourtaghavi Talemi

Department of Chemistry, Kharazmi (Tarbiat Moallem) University, Tehran, Iran

Sajjad Bakhtiari

Department of Chemistry, University of Tehran, Iran

Nabi Javadi

Department of Chemistry, Sharif University of Technology, Tehran, Iran

Morteza Vatanparast

Young Researcher and Elite Club, East Azerbaijan Science and Research Branch, Islamic Azad University, Tabriz, Iran