A disposable ion-selective optode for mercury based on trityl-picolinamide (T-Pico) as neutral ionophore was developed. The sensing layer consist of plasticised PVC incorporating T-Pico as a selective ionophore for Hg2+, ETH 5418 as a chromoionophore, and potassium tetrakis[3,5-bis(trifluoromethyl)phenyl] borate as Read More …
Category: Optrode
Tripodal Receptors for Cation and Anion Sensors
This review discusses different types of artificial tripodal receptors for the selective recognition and sensing of cations and anions. Examples on the relationship between structure and selectivity towards cations and anions are described. Furthermore, their applications as potentiometric ion sensing Read More …
Selective pool optode for mercury ion sensing in aqueous solution
A selective pool optode for mercury ion sensing has been developed. The selectivity of sensor operation is based on the reagent pool of safranin–iodide solution trapped behind the Nafion membrane, which is highly permeable to cations and excludes all anions Read More …
Simple regression model using an optode for the simultaneous determination of zinc and cadmium mixtures in aqueous samples
An optical-fiber chemical sensor (optode) is described for the simultaneous determination of Zn2+ and Cd2+ mixtures using 2-(5-bromo-2-pyridylazo)-5-(diethylamino)phenol immobilized onto XAD-4 (Br-PADAP/XAD-4). A simultaneous analysis was achieved by using a single-wavelength kinetic approach coupled with a regression model. Here, the Read More …
An optode for determination of mercury based on Nafion-diphenylcarbazone thin film in a flow-stream
An optode for determination Hg(II) ion has been developed using diphenylcarbazone (DC) immobilised in a Nafion(R) film. The film is transparent, homogeneous and mechanically strong, and changes in colour from orange to violet in the presence of Hg(II). The optode Read More …
A new solid state instrument for optical toxic metal ions sensing
A new measurement system for chemical optrodes based on the use of multi-LEDs and double-photodiodes is presented. A sensing area is illuminated through one branch of a bifurcated fibre optics with blue, yellow, red and IR LEDs of high intensities. Read More …
Polymeric encapsulated membrane for optrodes
Highly efficient and simple reagent immobilisation procedure for an optrode membrane has been developed. The preparation procedure combines two well-known physical immobilisation procedures, viz. adsorption and encapsulation techniques, applied sequentially which, in turn, produce a combined optical sensing layer. The Read More …
Capillary Optode: Determination of Mercury(II) in Aqueous Solution
A capillary optode for determination of mercury(II) in aqueous solution has been developed. The sensors are composed of the capillary glass tubes with a chemically sensitive coating on the inner surface, consisting of a 4-(2-thiazolylazo) resorcinol (TAR) and Nafion® composite Read More …
Characterisation of a Hg (II) ion optrode based on Nafion®-1-(2-thiazolylazo)-2-naphthol composite thin films
An optrode for Hg2+ ions based on a Nafion-1-(2-thiazolylazo)-2-naphtol (TAN) composite thin film has been developed. This optrode has a wide linear response range of 1-75 μM (pH 6) of Hg2+ ions with a limit of detection of 0.05 μM Read More …