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A new rhodamine functionalized fluorogenic Schiff base CS was synthesized and its colorimetric and fluorescence responses toward various metal ions were explored. The sensor exhibited highly selective and sensitive colorimetric and “off–on” fluorescence response towards Al3+ in the presence of other competing metal ions. These spectral changes are large enough in the visible region of the spectrum...
Excitation–emission matrix fluorescence (EEMF) and total synchronous fluorescence (TSF) spectroscopy are two conceptually different fluorescence techniques that have been used to map the fluorescence responses of the fluorophores present in a multifluorophoric mixture. EEMF was introduced four decades back and most of the fluorimeters have the suitable computer program which allows the acquisition...
A novel approach has been developed for the separation of organotin species with capillary electrophoresis hyphenated to time-of-flight mass spectrometry. It has been applied to the development of a method for the determination and speciation of organotin compounds namely, dibutyltin (DBT), tributyltin (TBT), diphenyltin (DPT) and triphenyltin (TPT) in water samples. Experiments were made with a special...
Preliminary complexation study showed that two ligands (ionophores) (2-((2-phenyl-2-(pyridin-2-yl)hydazono)methyl)pyridine) [L 1 ], (2-((2-phenyl-2-(pyridin-2-yl)hydazono) methyl)phenol) [L 2 ] can act as europium selective electrode. Europium selective coated graphite electrodes (CGE) were prepared by using ligands [L 1 ] and [L 2 ] and their potentiometric characteristics...
Petroleum fuels are generally non-polar. The presence of ethanol in the petrol–ethanol fuel blends increases the polarity of the fuel blend. It was observed that absorption spectral shift of the Reichardt's E T (30) dye is sensitive to the petrol–ethanol blend polarity. It was also found that E T (30) dye has a characteristic λ max of absorption in petrol–ethanol blends irrespective...
We report a new method for selective determination of acetaminophen (AP) in physiological condition. A new hybrid film modified electrode was fabricated using inorganic semiconducting nano-TiO 2 particles and redox active polymer. Redox polymer, poly(acid yellow 9) (PAY) was electrochemically deposited onto nano-TiO 2 coated glassy carbon (GC) electrode. Surface characterizations of...
The two cadmium chelates of schiff bases, N,N′-bis(salicylidene)-1,4-diaminobutane, (Cd-S 1 ) and N,N′-bis(salicylidene)-3,4-diaminotoluene (Cd-S 2 ), have been synthesized and explored as ionophores for preparing PVC-based membrane sensors selective to iodide(I) ion. Potentiometric investigations indicate high affinity of these receptors for iodide ion. Polyvinyl chloride (PVC)-based...
Here, we described a new method for electrochemically selective detection of dopamine (DA). In this report, for the first time, electrochemical polymerization of 4-amino-1-1′-azobenzene-3,4′-disulfonic acid (acid yellow 9 dye (AY)) was carried out onto the surface of glassy carbon (GC) electrode and indium tin oxide coated electrode (ITO) from acidic solution containing AY monomers. A polymerized...
A new approach for the analysis of Co(II), Ni(II) and Pd(II) as morpholine-4-carbodithioate (MDTC) complexes in aqueous medium by using solid phase microextraction (SPME)–high performance liquid chromatography (HPLC)–UV has been developed. The method involves sorption of metal complexes on PDMS fiber from aqueous solution followed by desorption in the desorption chamber of SPME–HPLC interface using...
The adsorption processes and electrochemical behavior of 4-nitroaniline (4-NA) adsorbed onto glassy carbon electrodes (GCE) have been investigated in aqueous 0.1M nitric acid (HNO 3 ) electrolyte solutions using cyclic voltammetry (CV). 4-NA adsorbs onto GCE surfaces, and upon potential cycling past −0.2V, is transformed into the arylhydroxylamine (ArHA) derivative which exhibits a well-behaved...
This paper reviews the practical applications of solid phase microextraction-High performance liquid chromatography in the analysis of toxic metal species as these are important contaminants and are carcinogenic. Their determination in formulations, in feed and food, and in complex environmental matrices (e.g., waste water and industrial effluents) often requires analytical methods capable of high...
A procedure has been developed for the determination of zinc(II) bis(dimethyldithiocarbamate) (Ziram) or zinc(II) ethylenebisdithiocarbamate (Zineb) present in a large volume of aqueous solution after preconcentration on a column using chitin–1-(2′pyridylazo)-2-naphthol (PAN) as adsorbent. Ziram/Zineb are quantitatively retained on the column as Zn–PAN complex in the pH range 9.0–11.0 and at a flow...
A new highly Tl(I)-selective PVC membrane electrode based on tetrathia macrocycle 6,7: 14,15-dibenzo-5,8,13,16-tetraoxo-1,4,9,12-tetrathiacyclohexadecane [Bz 2 O 4 (16)aneS 4 ] (I) as membrane carrier, o-nitrophenyloctyl ether (o-NPOE) as solvent mediator and potassium tetrakis(p-chlorophenyl)borate (KTpClPB) as lipophilic additive has been developed. The best performance was...
A new ion-selective electrode (ISE) based on dicyclohexano-18-crown-6 (DC18C6) as a neutral carrier is developed for lanthanum(III) ions. The electrode comprises of dicyclohexano-18-crown-6 (6%), PVC (33%), and ortho-nitrophenyl octyl ether (o-NPOE) (61%). The electrode shows a linear dynamic response in the concentration range of 10 -6 to 10 -1 M with a Nernstian slope of...
A simple and sensitive capillary electrophoretic method was developed for the separation and determination of Ziram and Zineb in boric acid buffer by direct UV absorbance detection at λ=254 nm. The separation is dependent on pH and nature of the buffer. The detection limits (S/N=3) are 1.88x10 -6 mol/l (0.57 μg/ml) and 2.48x10 -6 mol/l (0.68 μg/ml) for Ziram and Zineb, respectively...
A spectrophotometric method was developed for the determination of ferbam (iron(III) dimethyldithiocarbamate) by converting it into an iron-phenanthroline complex, which was then absorbed on microcystalline naphthalene in the presence of tetraphenylborate, and the absorbance was measured at 515 nm against a reagent blank. The molar absorptivity of the complex was 1.2 10 4 l mol - ...
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