Detection Of Silver Ions Research Articles

The first quantitative detection of silver ion at micromolar levels in water using a redox-switchable ligand

Abstract 1,1 - (1,4,10,13 - Tetraoxa - 7,16 - diazacyclooctadecane - 7,16-diyldimethyl)ferrocene, 1, is the first redox-switchable ligand that is useful in aqueous solution. This ligand can then be used to quantitatively detect Ag+ ion at micromolar concentration levels in such media. The efficacy of this unique ligand results, at least partially, from a novel direct interaction between the ferrocenyl iron atom and the bound silver cation. Differential pulse or square wave voltammetric methods were used to demonstrate the quantitative and reproducible detection of Ag− ion in the important concentration range 5–60 μM.

Ionic detection using differential measurement between an ion-sensitive FET and a reference FET

The possibility of obtaining ion-selective membranes on ISFETs by chemical grafting of the silica insulator has been previously shown. The grafting only slightly modifies the electrical characteristics of the transistor (the dielectric permitivity and thickness being nearly unchanged), which makes it possible to perform differential measurements between an ion-sensitive FET and a reference FET. For the detection of silver ions, the sensitive membrane (dimethylamino)silane onto silicon dioxide; the reference FET is an ISFET fabricated by grafting an aliphatic chain onto silicon dioxide. The response obtained, i.e., the difference between both source potentials versus a platinum pseudo-reference electrode, can be described with the site binding model. The differential method allows a miniaturized reference electrode to be used. At the same time, the effects of drift, temperature and residual pH response are reduced.

Silanization of Si / SiO2 Structures for Detection of Silver Ions

not Available.

Determination of microgram amounts of bromide by coulometric argentimetry

A method for determining microgram amounts of bromide by means of coulometric argentimetry has been developed. This method permits determination of 5–100μg of bromide in a sample volume of up to 10 ml with errors from + 3 to + 0.4%. The optimum conditions for detection of silver ions by means of a microelectrode biamperometric system have been determined. From the influence of current densities on the course of titration the optimum conditions for the determination of bromide in the presence of chloride are described.