scholarly journals Surfactant Enhanced-Spectrophotometric Determination of Uranium (VI) at Trace Levels by Using Eriochrome Black T as a Chelating Agent

2017 ◽  
Vol 36 (3) ◽  
pp. 37 ◽  
Author(s):  
Ramazan Gürkan ◽  
Halil İbrahim Ulusoy ◽  
Mehmet Akçay
Keyword(s):  
Absorption Coefficient ◽  
Cationic Surfactant ◽  
Spectrophotometric Method ◽  
Tap Water ◽  
Bathochromic Shift ◽  
Molar Absorption Coefficient ◽  
Benzene Derivative ◽  
Eriochrome Black T ◽  
Lake Water Sample

A sensitive and relatively selective spectrophotometric method is proposed for the rapid determination of uranium using Eriochrome Black T (EBT) being a 2,2’-dihydroxy azo benzene derivative metal indicator in the presence of cationic surfactant of N-cetyl N,N,N-trimethylammonium bromide (CTAB). The complex formation reaction between EBT and uranyl ion, UO2 2+ is instantaneous in presence of NH3/NH4Cl buffer at pH 9.5 and the absorbance as analytical signal remains stable for over 6 h. CTAB as cationic surfactant and polyethylene glycol p-(1,1,3,3-tetramethylbutyl)-phenyl ether, octyl phenol ethoxylate (Triton X-100) as nonionic surfactant are used for improving the sensitivity and solubility of the analytical system, respectively. The proposed method allows the determination of uranium in the concentration range of 0.025-2 μg mL–1 with a molar absorption coefficient of 92440.60 L mol–1 cm–1 and Sandell’s sensitivity of 2.92 μg cm2- in micellar medium while it allows the determination of uranium in the concentration range of 0.25-2.5 μg mL–1 with a molar absorption coefficient of 57019.44 L mol–1 cm–1 and Sandell’s sensitivity of 4.74 μg cm2- at 565 nm in water. The method has a detection limit of 4.60 μg L–1 (CDL: 3Sb/m) at an analytical measurement wavelength of 637 nm with a bathochromic shift of 72 nm. The selectivity of chelating reagent was improved by the use of a mixture containing ethylenediaminetetraacetic acid (EDTA), sulfosalycylic acid and NaF as masking agent. The proposed method has been successfully applied to the determination of uranium at trace levels in different environmental water samples such as tap-water, natural springwater and river-water. The precision (with coefficient of variation of 1.85%) and the accuracy obtained were highly satisfactory. In order to test the accuracy and validation of the method, the certified reference material (TMDA-70; fortified lake water sample) was also analyzed. It was found that the found and the certified values were in good agreement for validating the surfactant enhanced-spectrophotometric method.

scholarly journals A New Kinetic Spectrophotometric Method for the Quantitation of Amorolfine

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
César Soto ◽  
Cristian Poza ◽  
David Contreras ◽  
Jorge Yáñez ◽  
Fallon Nacaratte ◽  
...  
Keyword(s):  
Spectrophotometric Method ◽  
Tap Water ◽  
Fixed Time ◽  
Fungal Cell ◽  
Inhibition Of Growth ◽  
Fungicide Activity ◽  
Dual Inhibition ◽  
Assay Precision ◽  
Kinetic Spectrophotometric

Amorolfine (AOF) is a compound with fungicide activity based on the dual inhibition of growth of the fungal cell membrane, the biosynthesis and accumulation of sterols, and the reduction of ergosterol. In this work a sensitive kinetic and spectrophotometric method for the AOF quantitation based on the AOF oxidation by means of KMnO4at 30 min (fixed time), pH alkaline, and ionic strength controlled was developed. Measurements of changes in absorbance at 610 nm were used as criterion of the oxidation progress. In order to maximize the sensitivity, different experimental reaction parameters were carefully studied via factorial screening and optimized by multivariate method. The linearity, intraday, and interday assay precision and accuracy were determined. The absorbance-concentration plot corresponding to tap water spiked samples was rectilinear, over the range of 7.56 × 10−6–3.22 × 10−5 mol L−1, with detection and quantitation limits of 2.49 × 10−6 mol L−1and 7.56 × 10−6 mol L−1, respectively. The proposed method was successfully validated for the application of the determination of the drug in the spiked tap water samples and the percentage recoveries were 94.0–105.0%. The method is simple and does not require expensive instruments or complicated extraction steps of the reaction product.

The determination of ammonia in sea water

1967 ◽  
Vol 47 (2) ◽  
pp. 271-280 ◽  
Author(s):  
B. S. Newell
Keyword(s):  
Absorption Coefficient ◽  
Sea Water ◽  
Molar Absorption Coefficient ◽  
English Channel ◽  
Precise Method ◽  
Chloramine T ◽  
Oxidation Of Ammonia

A sensitive, specific and precise method for the determination of ammonia in sea water is presented. The method depends upon the oxidation of ammonia by chloramine-T and subsequent coupling with phenol to produce indophenol blue in an n-hexanol extract. Molar absorption coefficient ca 84,000. Values of ammonia measured in samples from the English Channel are given and the effect of freezing on samples for ammonia analysis is discussed.

Experimental Determination of the Molar Absorption Coefficient of n -Hexane Adsorbed on High-Silica Zeolites

ChemPhysChem ◽  
2017 ◽  
Vol 18 (17) ◽  
pp. 2374-2380 ◽  
Author(s):  
Giorgio Gatti ◽  
Diana F. Olivas Olivera ◽  
Vittoria Sacchetto ◽  
Maurizio Cossi ◽  
Ilaria Braschi ◽  
...  
Keyword(s):  
Absorption Coefficient ◽  
Experimental Determination ◽  
Molar Absorption Coefficient ◽  
High Silica ◽  
High Silica Zeolites

scholarly journals Extractive Spectrophotometric Method for Determination of Anti-Viral Drug Ribavirin Using Eriochrome Black-T

2014 ◽  
Vol 26 (10) ◽  
pp. 2992-2996
Author(s):  
Nawal A. Alarfaj ◽  
Reda A. Ammar ◽  
Maha F. El-Tohamy
Keyword(s):  
Spectrophotometric Method ◽  
Eriochrome Black T

Extractive Spectrophotometric Determination of Trace Amounts of Sulfur Dioxide in Air

1992 ◽  
Vol 75 (6) ◽  
pp. 1006-1010 ◽  
Author(s):  
B S M Kumar ◽  
N Balasubramanian
Keyword(s):  
Sulfur Dioxide ◽  
Absorption Coefficient ◽  
Spectrophotometric Method ◽  
Coefficient Of Variation ◽  
Formaldehyde Solution ◽  
Low Concentrations ◽  
Color System ◽  
Isopentyl Alcohol ◽  
Sensitive Spectrophotometric Method

Abstract A sensitive spectrophotometric method was developed for the determination of trace amounts of sulfur dioxide (SO2) in air after SO2 has been fixed in a buffered formaldehyde solution. The reaction of iodate with the fixed SO2 in the presence of an acid and an excess of chloride leads to the formation of ICI2 ions. The resulting ICI2 species forms an ionpair with pararosaniline cation; the product is extracted into isopentyl alcohol and measured spectrophotometrically at 560 nm. The color system obeys Beer's law over the range 0-40 μg SO2. The color is stable for 72 h from the time of extraction. The molar absorption coefficient of the color system is 4.5 x 103Lmol"1cm"1. The coefficient of variation is 3.6% for 10 determinations at 20 μg SO2. The effect of interfering gases on the determination is discussed. The method was applied to the determination of SO2 at low concentrations, and the results obtained were compared with the widely used West and Gaeke method. The method can be used to determine as low as 2 μg S02

Spectrophotometric Study on the Determination of Palladium with 4 -(5-Bromo-2-Pyridyl)-Azo-1,3-Diaminobenzene

2013 ◽  
Vol 781-784 ◽  
pp. 51-54
Author(s):  
Wei Qu ◽  
Cheng Ying Zhou
Keyword(s):  
Sulfuric Acid ◽  
Absorption Coefficient ◽  
Absorption Spectra ◽  
Spectrophotometric Method ◽  
Palladium Catalysts ◽  
Spectrophotometric Study ◽  
Heating Time ◽  
Complex Effect ◽  
Interfering Ions

This document develops a new spectrophotometric method for the determination of palladium with 4-(5-bromo-2-pyridyl)-azo-1,3-diaminobenzene, in a medium of 1.80mol/L sulfuric acid, at the maximum wavelength of 566nm. Absorption spectra of reagent and complex, effect of acidity, composition of complex and heating time for color reaction are discussed. More than 30 kinds of interfering ions are determined. The interference of Pb2+, Ag+ and Cr6+ are eliminated effectively by the proposed method. Beers law is obeyed in the concentration ranges of 0-1.0mg/L for palladium, the molar absorption coefficient is 6.44×104Lmol-1cm-1. The method is applied to the determination of palladium in general ores and palladium catalysts.

scholarly journals Variation of ratio kinetic profiles as a simple and novel spectrophotometric method for the simultaneous kinetic analysis of binary mixtures

2012 ◽  
Vol 77 (3) ◽  
pp. 349-361 ◽  
Author(s):  
Abdolhossein Naseri ◽  
Shokoofeh Malakzadeh-Rousta
Keyword(s):  
Experimental Data ◽  
Simultaneous Determination ◽  
Binary Mixtures ◽  
Spectrophotometric Method ◽  
Binary Systems ◽  
Tap Water ◽  
Mathematical Explanation ◽  
Oxidation Reactions ◽  
Kinetic Spectrophotometric

In this paper, a new and very simple kinetic - spectrophotometric method is developed for the simultaneous determination of binary mixtures without prior separational steps. The method is based on the calculation of the variation of ratio kinetic profiles. The mathematical explanation of the procedure is also illustrated. The proposed method can be used for simultaneous determination of two analytes A and B that react with the same reagent to give the same absorbing species. In order to evaluate the applicability of the method, a model data as well as an experimental data were tested. The results from experimental data relating to the simultaneous spectrophotometric determination of Co (II) and V (IV) based on their oxidation reactions with Fe (III) in the presence 1, 10- Phenanthroline (Phen) in micellar media were presented as a real model for resolution of the binary systems. The applicability of the method in tap water and synthesized alloy samples was also assessed by spiking experiments with different amount of Co (II) and V (IV).

Sign in / Sign up

Export Citation Format

Share Document