scholarly journals Micelle-mediated extraction of cobalt and its spectrophotometric determination in rocks, soils, sediments and sea-bed polymetallic nodules

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Spectrophotometric Determination ◽  
Certified Reference Materials ◽  
Molar Absorptivity ◽  
Present System ◽  
Sea Bed ◽  
Soil Sediment ◽  
Polymetallic Nodules ◽  
Ph Range ◽  
Almost All

The surfactant sensitized bottle-green complex (1:2:1) formed of cobalt-thiocyanate-cetyltrimethylammonium bromide is suitably extracted into an organic solvent, ethylacetate, at a pH range, 6-8 and the absorption measurements were carried out at 630 nm (ƛmax). The Beer’s law is obeyed in the range from 0.05 to 10 μg per mL. The molar absorptivity and Sandell’s sensitivity of the present system were found to be 2.2 x 103 L.mol-1cm-1 and 0.026 μg cm-2, respectively. No other element forms complex of similar colour with thiocyanate at this pH range. The method was applied to a number of samples like rock, soil, sediment, polymetallic nodules etc., as well as Certified Reference Materials and the values were found highly satisfactory. The interference of Fe3+ which formed a reddish complex at acidic pH (<7) was eliminated when the complex was extracted at pH 8.0. The method is highly useful for the determination of cobalt in geological samples having its concentration from μg/mL to percentage level. As the method has been made highly selective for spectrophotometric determination of cobalt, it might be applied to almost all types of geological sample of diverse matrices.

scholarly journals Micelle-mediated extraction of cobalt and its spectrophotometric determination in rocks, soils, sediments and sea-bed polymetallic nodules

2019 ◽  
Author(s):  
Chem Int ◽  
Pranab Kumar Tarafder
Keyword(s):  
Spectrophotometric Determination ◽  
Certified Reference Materials ◽  
Molar Absorptivity ◽  
Present System ◽  
Sea Bed ◽  
Soil Sediment ◽  
Polymetallic Nodules ◽  
Ph Range ◽  
Almost All

The surfactant sensitized bottle-green complex (1:2:1) formed of cobalt-thiocyanate-cetyltrimethylammonium bromide is suitably extracted into an organic solvent, ethylacetate, at a pH range, 6-8 and the absorption measurements were carried out at 630 nm (ƛmax). The Beer’s law is obeyed in the range from 0.05 to 10 μg per mL. The molar absorptivity and Sandell’s sensitivity of the present system were found to be 2.2 x 103 L.mol-1cm-1 and 0.026 μg cm-2, respectively. No other element forms complex of similar colour with thiocyanate at this pH range. The method was applied to a number of samples like rock, soil, sediment, polymetallic nodules etc., as well as Certified Reference Materials and the values were found highly satisfactory. The interference of Fe3+ which formed a reddish complex at acidic pH (<7) was eliminated when the complex was extracted at pH 8.0. The method is highly useful for the determination of cobalt in geological samples having its concentration from μg/mL to percentage level. As the method has been made highly selective for spectrophotometric determination of cobalt, it might be applied to almost all types of geological sample of diverse matrices.

scholarly journals Extractive Spectrophotometric Determination of Pd(II) with Sodium Salt of Hexamethyleneiminecarbodithioate

2013 ◽  
Vol 23 ◽  
pp. 20-28
Author(s):  
S.D. Dhanavate ◽  
D.J. Garole ◽  
V.J. Garole ◽  
S.R. Tetgure ◽  
A.D. Sawant
Keyword(s):  
Metal Ions ◽  
Spectrophotometric Determination ◽  
Sodium Salt ◽  
Accurate Determination ◽  
Chelating Agent ◽  
Molar Absorptivity ◽  
Real Samples ◽  
Highly Sensitive ◽  
Ph Range

The reagent NaHMICdt·2H2O has found to be a good chelating agent for the spectrophotometric determination of various metal ions. The present investigation deals with spectrophotometric determination of Pd(II) by using NaHMICdt·2H2O. The reagent reacted with Pd(II) to give yellow complex extractable into toluene. Pd (II) was extracted quantitatively in the pH range 0.5-2.0. Pd(II)-HMICdt complex showed λmax at 435 nm. The extracted species has a 1:2 (M:L) stoicheometry. Beer’s law is obeyed in the range of 0.2-0.8 μg ml-1 of Pd (II). The molar absorptivity and the sandells sensitivity were found to be 0.754 x 104 lmol-1cm-1 and 0.0140 μg mol-1 cm-2 respectively. The effect of divers ion on the extraction of Pd(II) has been investigated. The proposed method is highly sensitive, selective, and simple and rapid has been applied for accurate determination of palladium in synthesis mixtures and real samples.

Spectrophotometric determination of zinc with 5-methyl-1,3,4-thiadiazolyl-(2-azo-1)-2-naphthol

1983 ◽  
Vol 48 (2) ◽  
pp. 464-470 ◽  
Author(s):  
Juan Cacho ◽  
Cristina Nerin
Keyword(s):  
Spectrophotometric Determination ◽  
Organic Phase ◽  
Molar Absorptivity ◽  
Beer's Law ◽  
Optimum Ph ◽  
Beer’S Law ◽  
Ph Range ◽  
Optimum Ph Range

The reaction of Zn(II) with 5-methyl-1,3,4-thiadiazolyl-(2-azo-1)-2-naphthol (MTDAN) and extraction of the complex formed in chloroform is studied. The optimum pH range for the extraction and formation of the complex is 10-11.2 and Beer's law is obeyed in the interval of 0-2 ppm of Zn(II) in the organic phase. The molar absorptivity is 5.9 . 104 l mol-1 cm-1 at 568 nm. The stoichiometry of the complex corresponds to the type ML2. Some interferences are studied and an easy way is given to eliminate them. The results are compared with those corresponding to TAN. The reaction is applied to the analysis of synthetic samples of bronzes with satisfactory results.

scholarly journals Spectrophotometric Determination of Gold(III) Using 2-Hydroxy-3-Methoxy Benzaldehyde Thiosemicarbazone as a Chromophoric Reagent

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
D. Prem Kumar ◽  
A. Praveen Kumar ◽  
T. Veera Reddy ◽  
P. Raveendra Reddy
Keyword(s):  
Spectrophotometric Determination ◽  
Certified Reference Materials ◽  
Environmental Water ◽  
Molar Absorptivity ◽  
Zero Order ◽  
Gold Complex ◽  
Dimethyl Formamide ◽  
Spectrophotometric Methods ◽  
Benzaldehyde Thiosemicarbazone

A chromophoric reagent, 2-hydroxy-3-methoxy benzaldehyde thiosemicarbazone (HMBATSC), was employed for the sensitive spectrophotometric determination of gold(III). The gold(III) ion forms a blue-coloured complex with HMBATSC in an aqueous dimethyl formamide at pH 6.0. The gold complex shows the absorption maximum at 385 nm, and Beer's law was obeyed in the range 0.49–8.37 μg mL−1. The molar absorptivity and Sandell's sensitivity were found to be  L mol−1 cm−1 and 0.015 μg cm−2, respectively. The complex shows 1 : 1 [Au(III) : HMBATSC] stoichiometry with a stability constant of . The interference effect of various diverse ions has been studied. In addition to zero-order, first- and second-order derivative spectrophotometric methods were also developed for the determination of gold(III) in microgram amounts which were more sensitive than the zero-order method. The developed method has been used for the determination of gold(III) in environmental water samples and certified reference materials. The results were in excellent agreement with the certified values.

scholarly journals Difference spectrophotometric method for the determination of Fluphenazine hydrochloride in tablets using peroxomonosulfate

2021 ◽  
Vol 9 (2) ◽  
pp. 64-71
Author(s):  
Mykola Blazheyevskiy ◽  
◽  
Valeriy Moroz ◽  
Olena Mozgova ◽  
◽  
...  
Keyword(s):  
Quantitative Determination ◽  
Spectrophotometric Determination ◽  
Spectrophotometric Method ◽  
Present Method ◽  
Molar Absorptivity ◽  
Limit Of Quantification ◽  
Derivatizing Agent ◽  
Sensitive Method

The oxidative derivatization method using potassium hydrogenperoxomonosulfate for the indirect spectrophotometric determination of Fluphenazine hydrochloride is presented. Potassium hydrogenperoxomonosulfate is introduced as a derivatizing agent for Fluphenazine hydrochloride, yielding the sulfoxide. This reaction product was successfully used for the spectrophotometric determination of the Fluphenazine hydrochloride. The UV spectroscopic detection of the sulfoxide proved to be a more robust and sensitive method. The elaborated method allowed the determination of Fluphenazine hydrochloride in the concentration range of 0.2-30 µg mL-1. The molar absorptivity at 349 nm is 5.6×103 (dm3cm-1mol-1). The limit of quantification, LOQ (10S) is 0.24 µg/mL. A new spectrophotometric technique was developed and the possibility of quantitative determination of Fluphenazine hydrochloride in tablets 5.0 mg was demonstrated. The present method is precise, accurate and excipients did not interfere. RSD for Fluphenazine Hydrochloride 5.0 mg tablets was 1.37 %.

scholarly journals Selective Extraction and Determination of Chromium Concentration Using Luffa cylindrica Fibers as Sorbent and Detection by FAAS

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
José A. de Sousa Neto ◽  
Jordana de A. N. Oliveira ◽  
Lizandra M. C. Siqueira ◽  
Vanessa N. Alves
Keyword(s):  
Solid Phase ◽  
Certified Reference Materials ◽  
Energy Drinks ◽  
Selective Extraction ◽  
Chromium Concentration ◽  
Injection System ◽  
Luffa Cylindrica ◽  
Ph Range ◽  
System Variables

In this approach, a nonchromatographic method was developed for selective extraction and determination of Cr(III) concentration in isotonic and energy drinks by FAAS. This new method uses Luffa cylindrica fibers as the solid phase extraction and an off-line flow injection system. Cr(III) and Cr(VI) adsorption behavior onto Luffa fibers allowed the selective separation of Cr(III) in the pH range of 4 to 5. The system variables were optimized through full factorial and Doehlert designs. Under optimal conditions, the detection and quantification limit for Cr(III) was 19.2 µg·L−1 and 63.9 µg·L−1, respectively, with precision below 0.19%. A high tolerance toward interfering ions was observed for the proposed method. Recovery test results obtained for different isotonic and energy drinks samples were higher than 87.6%. The method’s accuracy was confirmed through analysis of certified reference materials, water and sediment river samples (APS-1071 and APS-1066).

scholarly journals Spectrophotometric Determination of Trace Concentrations of Copper in Waters Using the Chromogenic Reagent 4-Amino-3-Mercapto-6-[2-(2-Thienyl)Vinyl]-1,2,4-Triazin-5(4H)-One: Synthesis, Characterization, and Analytical Applications

2020 ◽  
Vol 10 (11) ◽  
pp. 3895 ◽  
Author(s):  
Salman. S. Alharthi ◽  
Hamed. M. Al-Saidi
Keyword(s):  
Chemical Structure ◽  
Copper Concentration ◽  
Certified Reference Materials ◽  
Tap Water ◽  
Molar Absorptivity ◽  
Icp Oes ◽  
Chromogenic Reagent ◽  
Ft Ir ◽  
Trace Concentrations

A simple, selective, and inexpensive spectrophotometric method is described in the present study for estimation of trace concentrations of Cu2+ in water based on its reaction with chromogenic reagent namely 4-amino-3-mercapto-6-[2-(2-thienyl)vinyl]-1,2,4-triazin-5(4H)-one (AMT). The reaction between copper(II) ions and AMT reagent gives [Cu(L)(NO3)(H2O)2]•H2O complex, where L represents AMT molecule with NH group. The formed complex exhibits a sharp, and well-defined peak at λmax = 434 nm with a molar absorptivity (ε) of 1.90 × 104 L mol−1 cm−1, and Sandell’s factor of 0.003 μg mL−2. Absorbance of the [Cu(L)(NO3)(H2O)2]•H2O follows Beer’s law over a 0.7–25 μg mL−1 range with a detection limit of 0.011 μg mL−1. Validation of the submitted method was established by estimating Cu2+ in certified reference materials and actual sea and tap water samples. The results are compared with data obtained from copper concentration measurements using ICP-OES. The chemical structure of the Cu(II)-AMT complex was fully characterized by FT-IR, SEM, EDX, TGA, and ESR techniques.

Gold and alloy nanoparticles in solution and thin film assembly: spectrophotometric determination of molar absorptivity

2003 ◽  
Vol 496 (1-2) ◽  
pp. 17-27 ◽  
Author(s):  
Mathew M. Maye ◽  
Li Han ◽  
Nancy N. Kariuki ◽  
Nam K. Ly ◽  
Wai-Ben Chan ◽  
...  
Keyword(s):  
Thin Film ◽  
Spectrophotometric Determination ◽  
Molar Absorptivity ◽  
Alloy Nanoparticles ◽  
Film Assembly

scholarly journals UV-Vis Spectrophotometric Determination of Selected Heavy Metals (Pb, Cr, Cd and As) in Environmental, Water and Biological Samples with Synthesized Glutaraldehyde Phenyl Hydrazone as the Chromogenic Reagent

2021 ◽  
Vol 2 (3) ◽  
pp. 1-5
Author(s):  
Samuel Echioda ◽  
Adepeju Oluwabunmi Ogunieye ◽  
Salisu Salisu ◽  
Amina Abdulazeez Abdulrasheed ◽  
I. Y. Chindo ◽  
...  
Keyword(s):  
Spectrophotometric Determination ◽  
Biological Samples ◽  
Environmental Water ◽  
Molar Absorptivity ◽  
Ligand Complex ◽  
Chromogenic Reagent ◽  
Validity Range ◽  
Metal Ligand ◽  
Water And Biological Samples

A simple, sensitive, selective, and non-extractive UV-Vis spectrophotometric method for the determination of cadmium, lead, chromium, and arsenic in biological, soil and water samples using synthesized and characterized phenyl hydrazone; glutaraldehydephenyl hydrazone (GPH) as the chromogenic reagent was developed. GPH was synthesized as new chromogenic analytical reagents for the direct UV-Vis spectrophotometric determination of the selected metals of interest in a slightly acidic pH of 6.5-7.5 and 20 % dimethylformamide (DMF) solution to give stable coloured metal-ligand complexes. The reactions were instantaneous; the wavelengths of maximum absorptions were followed spectrophotometrically and noted. The reagent GPH revealed a wavelength of maximum absorption between 360.0 (Cr) to 395.0 nm for (Pb and As) at a working pH of 6.5 to 7.5 room temperature (37 °C). The reagent GPH had a molar absorptivity (L mol-1 cm-1) ranging from 2.213×104 (Pb) to 2.460×104 (As), a mole ratio of metal to ligand of 2:1, the detection limit (µg/g) ranging from 0.3432 (As) to 0.5250 (Pb) and the metal-ligand complex was stable for 0-48 hours. The reagents had a Beer’s law validity range (mg L-1) of 0.001 to 100. The Sandell’s sensitivities (µg/cm2) ranged from 0000409 (As) to 0.00499 (Pb) for APDH and 0.00406 (As) to 0.00452 (Pb) respectively. Large excess of cations and anions as possible interferences up to 15 folds were studied and do not interfere with the determination of the selected metals of interest. The developed method is highly selective for Cd, Pb, and Cr and As and was successfully used for the determination for the said elements in soil, water, and biological samples. The results of the developed methods were comparable with AAS and were found to be in good agreement. The method had very high precision and very good accuracy.

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