A novel methodology for the determination of Hg(II) ions was developed based on optical fiber chemical sensing in a microfluidic device containing a selective tripodal chromoionophore (i.e. tris[2-(4-phenyldiazenyl)phenylamino)ethoxy]cyclotriveratrylene/TPPECTV)-PVC film. Absorbance detection was performed by incorporating a single optical fiber on Read More …
Tag: Metal ion
Selective Chemosensor Based on 7-Nitrobenzofurazan in Tripodal Structure for the Detection of Hg(II) Ions in Environmental and Cosmetic Samples
A selective tripodal chemosensor based on 1,1,1-tris[(7-nitrobenzofurazan-4-yl)-n-1-aza-5-oxahexanyl] propane (1, TNFHP) has been developed for the detection of Hg(II) ions. This receptor exhibits a pronounced chromogenic behavior toward Hg(II) ions by changing the color of the solution from yellow to dark Read More …
Selective chemosensor for Hg(II) ions based on tris[2-(4-phenyldiazenyl)phenylaminoethoxy]cyclotriveratrylene in aqueous samples
A novel chemosensor, based on tris[2-(4-phenyldiazenyl)phenylaminoethoxy]cyclotriveratrylene (TPPECTV) as chromophore, has been developed for the colorimetric determination and visual detection of Hg(II) ions. TPPECTV exhibits a pronounced chromogenic behavior toward Hg(II) ions by changing the color of the solution from yellow Read More …
Development of a disposable mercury ion-selective optode based on trityl-picolinamide as ionophore
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 …
Recent Advances in Optical DNA Biosensors Technology
Recent advances in nucleic acids-based biosensors have led to the development of DNA biosensors for DNA hybridisation detection and for nucleic acid-ligand binding studies. This review presents a concise description and an evaluation of the optical devices that have been Read More …
Simple optical fibre biosensor based on immobilised enzyme for monitoring of trace heavy metal ions
A simple optical fibre biosensor based on immobilised enzyme for monitoring of trace heavy metal ions has been developed. The biosensor recognition system was designed based on the inhibition of urease activity, where the urease is immobilised on ultrabind membrane. 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 …