The reaction of Se(IV) with 2-aminodiphenylamine and its application to spectrophotometric determination of selenium in a strongly acidic medium

1989 ◽  
Vol 97 (5-6) ◽  
pp. 337-347 ◽  
Author(s):  
Barbara Kasterka
Keyword(s):  
Spectrophotometric Determination ◽  
Acidic Medium

scholarly journals Rapid Spectrophotometric Determination of Phenoxazine

2010 ◽  
Vol 7 (2) ◽  
pp. 1001-1005
Author(s):  
Baghdad Science Journal
Keyword(s):  
Detection Limit ◽  
Spectrophotometric Determination ◽  
Acidic Medium ◽  
Absorption Maximum ◽  
Aqueous Samples ◽  
Economic Method ◽  
Beer's Law ◽  
Beer’S Law ◽  
The Stability

A rapid high sensitive and inexpensive economic method has been developed for the Determination of phenoxazine by using molecular spectrophotometry. The method is based on the oxidation of phenoxazine by potassium (meta)periodate in acidic medium. The oxidation conditions were selected to enhance the sensitivity and the stability of the pink colored species which shows an absorption maximum at 530 nm. The Beer’s law was obeyed for phenoxazine concentration range from 1 to 6 µg mL-1 with 0.003 µg mL-1 detection limit and provided variation coefficients between 0.4 to 1.7 %. This method was successfully applied for the determination of phenoxazine in aqueous samples

A new optical sensor for spectrophotometric determination of uranium (VI) and thorium (IV) in acidic medium

2017 ◽  
Vol 105 (12) ◽  
Author(s):  
O. A. Elhefnawy
Keyword(s):  
Spectrophotometric Determination ◽  
Spectrophotometric Method ◽  
Optical Sensor ◽  
Acidic Medium ◽  
Complexation Reaction

AbstractA spectrophotometric method was developed for U(VI) and Th(IV) determination in acidic medium by using proposed optical sensor. This sensor is base on the complexation reaction of the ionophore midodrine hydrochloride (

Flotation-Dissolution-Spectrophotometric Determination of Phorate in Various Environmental Samples

2020 ◽  
Vol 33 (1) ◽  
pp. 18-23
Author(s):  
Harshita Sharma ◽  
Anushree Saha ◽  
Chhaya Bhatt ◽  
Kalpana Wani ◽  
Ajay Kumar Sahu ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Spectrophotometric Determination ◽  
Acidic Medium ◽  
Molar Absorptivity ◽  
Ammonium Molybdate ◽  
Organophosphate Pesticide ◽  
Organic Layers ◽  
Relative Standard ◽  
Ion Associate

The proposed method is based on flotation–dissolution an easy, impressible, extractive spectrophotometric determination, explained for easy investigation of the organophosphate pesticide phorate (O,O-diethyl S-[ethylthiomethyl] phosphorodithioate) on trace levels. A molybdophospho complex is generated when prorate is treated with ammonium molybdate in acidic medium. As an ion associate complex with methylene blue the complex is present in between of the water and organic layers which is extracted and then dissolved with acetone. The greenish blue complex produced show absorption maxima at 660 nm. Beer’s law range is found to be 0.5 to 16 µg per 10 ml for phorate. The molar absorptivity is 0.989×103 L mol-1 cm-1 and sandell’s sensitivity is 1.00×10-5 µg cm-2. Also calculated the standard deviation and relative standard deviation for the above method were ±0.006 and 1.95% respectively. The method has been applied and checked for the determination of phorate in water, soil and vegetables.

scholarly journals A simple method for the spectrophotometric determination of cephalosporins in pharmaceuticals using variamine blue

2018 ◽  
Vol 33 (2) ◽  
pp. 41
Author(s):  
Chand Pasha ◽  
Badiadka Narayana
Keyword(s):  
Sodium Hydroxide ◽  
Spectrophotometric Determination ◽  
Spectrophotometric Method ◽  
Acidic Medium ◽  
Simple Method ◽  
Lactam Ring ◽  
Ph Range ◽  
Variamine Blue ◽  
Hydrolysis Of

A simple spectrophotometric method for the determination of cefotaxime, ceftriaxone, cefadroxil and cephalexin with variamine blue is presented. The determination is based on the hydrolysis of β-lactam ring of cephalosporins with sodium hydroxide which subsequently reacts with iodate to liberate iodine in acidic medium. The liberated iodine oxidizes variamine blue to violet colored species of maximum absorption at 556 nm. The absorbance is measured within the pH range of 4.0-4.2. Beer’s law is obeyed in the range of 0.5-5.8 μg mL–1, 0.2-7.0 μg mL–1, 0.2-5.0 μg mL–1 and 0.5-8.5 μg mL–1 for cefotaxime, ceftriaxone, cefadroxil and cephalexin respectively. The analytical parameters were optimized and the method is successfully applied for the determination of cefotaxime, ceftriaxone, cefadroxil and cephalexin in pharmaceuticals.

Study of reaction of 5-hydroxy-6-(2-hydroxy-5-sulfophenylazo)benzo(a)-phenazine with vanadates in the presence of Septonex

1980 ◽  
Vol 45 (3) ◽  
pp. 819-825 ◽  
Author(s):  
Nguyen Truong Son ◽  
Milan Kotouček ◽  
Eduard Ružička
Keyword(s):  
Aqueous Medium ◽  
Spectrophotometric Determination ◽  
Acidic Medium ◽  
Equilibrium Constants ◽  
Medium Ph

Reaction of 5-hydroxy-6-(2-hydroxy-5-sulfophenylazo)benzo(a)phenazine with vanadates in aqueous medium was studied in the presence and in the absence of the tenside Septonex. In acidic medium (pH 2-6), the complex VO2L is formed in both cases. The equilibrium constants for the equilibria studied were calculated and a procedure was suggested for spectrophotometric determination of vanadium.

scholarly journals A Simple, Sensitive Spectrophotometric Determination of Mosapride in Pharmaceutical Preparations Using Novel Reagent

2004 ◽  
Vol 1 (5) ◽  
pp. 267-271 ◽  
Author(s):  
G. Krishnamurthy Naidu ◽  
K. Suvardhan ◽  
M. V. Jyothi ◽  
B. S. Sastry ◽  
P. Chiranjeevi
Keyword(s):  
Optimum Condition ◽  
Spectrophotometric Determination ◽  
Spectrophotometric Method ◽  
Azo Dye ◽  
Acidic Medium ◽  
Pharmaceutical Preparations ◽  
Coupling Reaction ◽  
Pharmaceutical Formulation ◽  
Sensitive Spectrophotometric Method

A rapid, selective and sensitive spectrophotometric method for the determination of mosarpide in either pure form or in its formulations in pharmaceutical preparations is described. The method is based on the diazotization coupling reaction of mosapride with 1-naphthol in acidic medium to give red azo dye product with theλmaxof 500 nm and is stable for more than 12 hours at optimum condition, Beer's law is obeyed at concentration of 0.2 to 12 μg mL-1at the wavelength of maximum absorbance. Common excipients used as additives in pharmaceutical preparations do not interfere in the proposed method. The developed method is highly reproducible and applied to wide variety of pharmaceutical formulation and the results were compared favourably with the reported method.

4, 4’-Diantipyrylmethane (DAM): A tool for spectrophotometric microdetermination of cerium (IV)

2021 ◽  
Vol 25 (7) ◽  
pp. 49-55
Author(s):  
Amita Garg ◽  
Radhika Khanna ◽  
Parveen Rathi
Keyword(s):  
Spectrophotometric Determination ◽  
Trace Amount ◽  
Acidic Medium ◽  
Absorption Maximum ◽  
Molar Absorptivity ◽  
Complexing Agents ◽  
Complexing Agent ◽  
Good Reproducibility ◽  
Beer’S Law

A simple and hasty method has been employed for the direct spectrophotometric determination of trace amount of Ce(IV) using a complexing agent 4,4’-diantipyryl methane (DAM) with absorption maximum at 445-455nm in acidic medium at 1.3 -1.5 pH. Molar absorptivity and Sandell’s sensitivity were calculated to be 9.1 × 103 l mol-1 cm-1 and 0.015 μg Ce cm-2. Beer’s law was found to be defensible over the cerium concentration range of 0-5.5 μg ml-1. Effect of large number of cations, anions and complexing agents was also studied and several analytically important ions do not cause interference in the procedure except thiourea and EDTA. The method has good reproducibility and has been satisfactorily applied in the determination of cerium in samples.

Spectrophotometric Determination of Total Cr in Water

2018 ◽  
Author(s):  
Xhulieta Hamiti ◽  
Ilirjana Boci ◽  
Pranvera Lazo
Keyword(s):  
Spectrophotometric Determination
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