Aradhana K.K.V. Pillai
Rani Durgavati University
AnalyteAnalytical chemistryDetection limitGas chromatographyDrop (liquid)Mass spectrometryFlame ionization detectorInorganic chemistryHigh-performance liquid chromatographyAqueous solutionChemistryGas chromatography–mass spectrometryCalibration curveNitriteThiocyanatePermanganateSalt (chemistry)DerivatizationPhenolPhenolsTolidineSulfuric acidCyanideSolid-phase microextractionSample preparationChlorideDimethylanilineIodideNinhydrinAnilineIodateSpectrophotometrySolventHydroxylammonium chlorideAscorbic acidReagentChromatographyChlorineIodineMercury (element)Standard curveElutionSolid phase extraction
8Publications
8H-index
179Citations
Publications 8
Newest
#1Archana Jain (Rani Durgavati University)H-Index: 23
#2Soumitra Soni (Rani Durgavati University)H-Index: 2
Last. Krishna K. Verma (Rani Durgavati University)H-Index: 24
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Combined SDME and SPME worked as an elegant strategy to inject a large sampled mass of analytes into a GC. After headspace SDME of methyl derivatives of phenol, chlorophenols, methylphenols and other substituted phenols into 10 μL of solvent drop (1-butanol), the extract was subjected to headspace SPME (DVB/CAR/PDMS, 30/50 μm, fiber) for convenient transfer of analytes to the fiber and then into the GC. This combination resulted in achieving a high sensitivity of detection for a small volume (0....
10 CitationsSource
#1Archana Jain (Rani Durgavati University)H-Index: 23
#2Kishan Reddy-Noone (Rani Durgavati University)H-Index: 5
Last. Krishna K. Verma (Rani Durgavati University)H-Index: 24
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Abstract A novel and highly selective method has been developed for the determination of aromatic primary amines by their conversion to dithiocarbamates by reaction with carbon disulphide, and then to isothiocyanates, which are volatile, by heating in the presence of a heavy metal ion. Zinc(II) was selected owing to its low toxicity and optimum yield of isothiocyanates. The latter were sampled by headspace-solid phase microextraction (HS-SPME) on divinylbenzene-carboxen-polydimethylsiloxane fibr...
14 CitationsSource
#1Manju Gupta (Rani Durgavati University)H-Index: 11
#2Aradhana K.K.V. Pillai (Rani Durgavati University)H-Index: 8
Last. Krishna K. Verma (Rani Durgavati University)H-Index: 24
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Abstract 2-Iodosobenzoate and N,N -dimethylaniline have been used at pH 6.4 for selective conversion of iodide to 4-iodo- N,N -dimethylaniline which was extracted with ethanol, when the phase separation occurred by addition of ammonium sulphate, a process called salt-assisted liquid–liquid microextraction (SALLME), and analysed by high-performance liquid chromatography-diode array detection. Iodate was reduced to iodide before derivatisation. The method has been optimised for extracting solvent,...
41 CitationsSource
#1Archana Jain (Rani Durgavati University)H-Index: 23
#2Aradhana K.K.V. Pillai (Rani Durgavati University)H-Index: 8
Last. Krishna K. Verma (Rani Durgavati University)H-Index: 24
view all 4 authors...
Abstract Headspace single-drop microextraction has been used for the determination of cyanide with ninhydrin in combination with fibre-optic-based cuvetteless microspectrophotometry which accommodates sample volume of 1 μL placed between the two ends of optical fibres, and has been found to avoid salient drawbacks of batch methods. This method involved hydrocyanic acid formation in a closed vial, and simultaneous extraction and reaction with 2 μL drop of ninhydrin in carbonate medium suspended a...
21 CitationsSource
#1Aradhana K.K.V. Pillai (Rani Durgavati University)H-Index: 8
#2Archana Jain (Rani Durgavati University)H-Index: 23
Last. Krishna K. Verma (Rani Durgavati University)H-Index: 24
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Abstract Headspace single-drop microextraction has been investigated for the determination of chloride in conjunction with fibre optic-based cuvetteless micro-spectrophotometry which accommodates sample volume of 1 μL placed between the two ends of optical fibres. Method has been evolved for the determination of 0.025–4 mg L −1 of chloride involving its oxidation with permanganate in sulphuric acid medium, and reaction of chlorine with 2 μL drop of starch-iodide reagent suspended at the tip of m...
18 CitationsSource
#1Nisha Sharma (Rani Durgavati University)H-Index: 5
#2Aradhana K.K.V. Pillai (Rani Durgavati University)H-Index: 8
Last. Krishna K. Verma (Rani Durgavati University)H-Index: 24
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Abstract Liquid-phase microextraction (LPME) has been investigated for trace analysis in the present work in conjunction with fibre-optic-based micro-spectrophotometry which accommodates sample volume of 1 μL placed between the two ends of optical fibres. Methods have been evolved for the determination of (i) 1–100 μM and 0.5–20 μM of thiols by single drop microextraction (SDME) and LPME in 25 μL of the organic solvent, respectively, involving their reaction with the Ellman reagent and ion pair ...
27 CitationsSource
#1Aradhana K.K.V. Pillai (Rani Durgavati University)H-Index: 8
#2Khileshwari Gautam (Rani Durgavati University)H-Index: 1
Last. Krishna K. Verma (Rani Durgavati University)H-Index: 24
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Abstract A simple and rapid method has been reported for the determination of carbonyl compounds involving sample preparation by headspace single drop microextraction using 1-butanol as extraction solvent containing 2,4-dinitrophenylhydrazine for hydrazone formation, and direct transfer of the drop into the injector for high-performance liquid chromatography with diode array detection. An angle-cut polytetrafluoroethylene sleeve, 3 mm × 0.5 mm, was fixed at the tip of the syringe needle and this...
36 CitationsSource
#1Manju Gupta (Rani Durgavati University)H-Index: 11
#2Aradhana K.K.V. Pillai (Rani Durgavati University)H-Index: 8
Last. Krishna K. Verma (Rani Durgavati University)H-Index: 24
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Abstract Matrix interference removal is an important step when large volumes of aqueous samples are required to be processed to detect trace levels of analytes. A combination of two sample extraction methods has been used in this work with the aim of cleanup and preconcentration of analytes. For first objective, mild but preferential sorption of a range of analytes has been performed with in-tube solid-phase microextraction (SPME) using polytetrafluoroethylene (PTFE) tubing, and for the second, ...
20 CitationsSource