Square Wave Anodic Stripping Determination of Silver Using a Carbon Paste Electrode Modified with a Strong Acid Ion-Exchanger

Abstract

A chemically modified carbon paste electrode was developed for the determination of silver by incorporating the ion-exchanger Dowex 50 W Â 12 into a conventional graphite-Nujol oil paste. Silver(I) was accumulated at the electrode surface from solutions of the sample under open circuit conditions, then reduced at constant potential in a separate 0.1 M HNO 3 solution and finally determined by square wave (Osteryoung) anodic stripping voltammetry. The influence of paste composition, acummulation/reduction time, possible interferences and other experimental variables on the height and shape of the anodic peak was examined in detail. For 5 min of accumulation, the linear range was from 1.62 mg L À1 to 0.8 mg L À1 with a detection limit of 0.27 mg L À1 . The dynamic range could be extended up to 2.5 mg L À1 (from 0.92 mg L À1 to 2.5 mg L À1 ) with 20 min of preconcentration. The method showed good tolerance for Cu 2þ , Fe 3þ , Cd 2þ , Zn 2þ , Pb 2þ , and Au 3þ . Interference from Hg 2þ up to 5 mg L À1 was avoided by masking with EDTA in the preconcentration step.

Electrochemical determination of Ag-ions in environment waters and their action on plant embryos

“…A very sensitive technique for determination of silver ions based on PVC-membrane ion-selective bulk optode has been published [23]. Besides that, there have been shown number of different modifications working electrode to determine silver ions sensitively [24][25][26][27][28][29][30][31][32].…”

Fabrication of a new multi-walled carbon nanotube paste electrode for stripping voltammetric determination of Ag(i)

“…A number of analytical characteristics of the NBHAE-MCPE were compared with those previously reported for Ag(I) voltammetric sensors. 23,25,26,29,31,[34][35][36][37][38][39] The results are summarized in Table 4. As can be seen, the NBHAE-MCPE electrode shows better analytical characteristics, such as a lower detection limit and wider linear except, than previous reports.…”

“…As can be seen, the NBHAE-MCPE electrode shows better analytical characteristics, such as a lower detection limit and wider linear except, than previous reports. 23,37,38…”

Dispersive Liquid–Liquid Microextraction of Silver Prior to Determination by Microsample Introduction-Flame Atomic Absorption Spectrometry

“…The commonly used instrumental analysis techniques for silver ion determination in environmental waters are atomic absorption spectrometry (AAS) (Soylak and Cay 2007); inductively coupled plasma-mass spectrometry (ICP-MS) (Jingyu, Zheng, and Haizhon 2002); inductively coupled plasma-optical emission spectrometry (ICP-OES) (Smith, Motovka, and Willson 1984); stripping voltammetry (SV) (Gellon, Gonzalez, and Fontan 2003); high performance liquid chromatography (HPLC) (Mikelova et al 2007); and ion selective electrodes (ISE) (Singh, Singh, and Bhattacharjee 2003).…”