Selective determination of selenium(IV) from environmental samples by UV-visible spectrophotometry usingO-methoxyphenyl thiourea as a chelating ligand

Kuchekar, Shashikant R.; Naval, Ramesh M.; Han, Sung‐Hwan

doi:10.1080/03067319.2015.1046057

Cited by 10 publications

(2 citation statements)

References 21 publications

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“…In our laboratory we have developed extraction and spectrophotometric determination for rhodium(III) [17], ruthenium(III) [18], iridium(III) [19], palladium(II) [20] and osmium(IV) [21] using o-Methylphenyl thiourea (OMPT). In the extension of our work we have developed extraction spectrophotometric determination methods for palladium(II) [22], selenium(IV) [23], osmium(IV) and ruthenium(III) [24] with o-methoxy phenylthiourea (OMePT). The current study reports the analytical applications of o-Methoxy phenylthiourea (OMePT) for spectrophotometric determination of cerium(IV).…”

Section: Pmmentioning

confidence: 99%

Solvent Extraction and Spectrophotometric Determination of Cerium(IV) by Using o-Methoxy Phenylthiourea as an Analytical Reagent

Kuchekar¹,

Naval²,

Han

2016

SERDJ

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A solvent extraction spectrophotometric determination method was developed for cerium(IV) using o-methoxy phenylthiourea (OMePT) as a selective reagent. A ternary complex was formed after liquid-liquid extraction from 0.05 mol L-1 potassium iodide aqueous media using 2.0×10-4 mol L-1 OMePT in chloroform and is measured spectrophotometrically at 318 nm. The validity of Beer's law was in the concentration range up to 22.5 μg mL-1 , with molar absorptivity and Sandell's sensitivity values of 3.38×10 3 L mol-1 cm-1 and 0.041 μg cm-2 respectively. The stoichiometry of the cerium(IV)-OMePT-iodide complex was determined by the slope ratio method and verified by the mole ratio method. The complex was stable for more than 48 h. The method is free from interferences from large number of cations and anions. The developed method was successfully employed for the determination of cerium(IV) from binary synthetic mixtures, ternary synthetic mixtures, soil, tap water and sea water samples.

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Section: Pmmentioning

confidence: 99%

Solvent Extraction and Spectrophotometric Determination of Cerium(IV) by Using o-Methoxy Phenylthiourea as an Analytical Reagent

Kuchekar¹,

Naval²,

Han

2016

SERDJ

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“…Most of these probes (organic ligands, fluorophores, and colorimetric dyes) are −SH and −NH 2 -rich organic ligands that have limited scope for real time quantitative applications owing to photobleaching, stability, and related issues. Further, they are synthesized from expensive precursors using multistep reactions and complex work up procedures. − Therefore, to overcome all of these challenges, synthesis of novel materials is necessitated to develop a stable, cost-effective, and sensitive probe for selenite determination in water. Although few attempts on nanomaterials intervention in quantitative determination of selenite by optical means have yet been made, they require conventional technique integration .…”

Section: Introductionmentioning

confidence: 99%

Ultrasensitive and Selective Sensing of Selenium Using Nitrogen-Rich Ligand Interfaced Carbon Quantum Dots

Devi

Thakur

Chopra

et al. 2017

ACS Appl. Mater. Interfaces

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This work reports a label-free, ultrasensitive, and selective optical chemosensory system for trace level detection of selenite (SeO), the most toxic form of selenium, in water. The probe, i.e., carbon quantum dots (CQDs), is designed from citric acid by means of pyrolysis and is interfaced with a newly synthesized nitrogen-rich ligand to create a selective sensor platform (functionalized CQDs, fCQDs) for selenite in a water matrix. Spectral (NMR, UV-vis, photoluminescence, Raman, and Fourier transform infrared analyses) and structural (high-resolution transmission electron microscopy) characteristics of the designed new probe were investigated. The developed sensor exhibits high sensitivity (limit of detection = 0.1 ppb), a wide detection range (0.1-1000 ppb range, relative standard deviation: 3.2%), and high selectivity even in the presence of commonly interfering ions reported to date, including Cl, NO, NO, Br, F, As(V), As(III), Cu, Pb, Cd, Zn, Sr, Rb, Na, Ca, Cs, K, Mg, Li, NH, Co, etc. The observed selectivity is due to designed ligand characteristics in terms of strong Se-N chemistry. Ultrafast spectroscopic analysis of the fCQDs in the absence and presence of selenite was studied to understand the sensing mechanism. The sensor was successfully exemplified for real water samples and exhibits comparative performance to conventional ion channel chromatography as well as flame atomic absorption spectroscopy for selenite analysis. The promising results pave ways for realization of a field deployable device based upon a developed probe for selenite quantification in water.

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Optical Sensors and Materials for Selenium Determination in Water

Jain

Thakur

Kumar

et al. 2021

Selenium Contamination in Water

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Selective determination of selenium(IV) from environmental samples by UV-visible spectrophotometry usingO-methoxyphenyl thiourea as a chelating ligand

Cited by 10 publications

References 21 publications

Solvent Extraction and Spectrophotometric Determination of Cerium(IV) by Using <i>o</i>-Methoxy Phenylthiourea as an Analytical Reagent

Solvent Extraction and Spectrophotometric Determination of Cerium(IV) by Using <i>o</i>-Methoxy Phenylthiourea as an Analytical Reagent

Ultrasensitive and Selective Sensing of Selenium Using Nitrogen-Rich Ligand Interfaced Carbon Quantum Dots

Optical Sensors and Materials for Selenium Determination in Water

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