A new spectrophotometric method for the micro determination of sulfuric acid esters in sulfatide fractions

1960 ◽  
Vol 48 (4) ◽  
pp. 502-509 ◽  
Author(s):  
Frank J. Witmer ◽  
James H. Austin
Keyword(s):  
Sulfuric Acid ◽  
Spectrophotometric Method ◽  
Acid Esters

scholarly journals A Simple Spectrophotometric Determination of Phosphate in Sugarcane Juices, Water and Detergent Samples

2007 ◽  
Vol 4 (4) ◽  
pp. 467-473 ◽  
Author(s):  
Mahadevaiah ◽  
M. S. Yogendra Kumar ◽  
Mansour S. Abdul Galil ◽  
M. S. Suresha ◽  
M. A. Sathish ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Standard Deviation ◽  
Spectrophotometric Method ◽  
Molar Absorptivity ◽  
Official Method ◽  
Sodium Sulphide ◽  
Cane Juice ◽  
Sulfuric Acid Medium ◽  
Sugar Cane Juice

A simple spectrophotometric method is developed for the determination of phosphate in sugar cane juice, water and detergent samples. The method is based on the formation of phosphomolybdate with added molybdate followed by its reduction with sodium sulphide in aqueous sulfuric acid medium. The system obeys Lambert-Beer’s law at 715 nm in the concentration range 0.3-12.24 ppm. Molar absorptivity, correlation coefficient and Sandell’s sensitivity values were found to be 6.1x103mol-1cm-1, 0.999 and 0.0156 µg cm-2respectively. The results obtained were reproducible with acceptable standard deviation 3.7% and relative error 3.4%. For a comparison of the method phosphate present in various samples were also determined separately following an official method. The results of the developed method compare well with those of the official method.

scholarly journals A Study of the Reaction between Germanium Dioxide and Concentrated Sulfuric Acid. A New Spectrophotometric Method for the Determination of the Stability Complexes of the Form ABn and ADp in Mixture.

1974 ◽  
Vol 28a ◽  
pp. 115-116 ◽  
Author(s):  
Gunnar Norheim ◽  
Conrad Krohn ◽  
A. M. Sargeson ◽  
C. E. Schäffer ◽  
Alf Bjørseth ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Spectrophotometric Method ◽  
Germanium Dioxide ◽  
Concentrated Sulfuric Acid ◽  
The Stability

Measurement of Cholesterol in Tissues with Phospho-6-tungstic-12-molybdic Acid

1969 ◽  
Vol 15 (9) ◽  
pp. 829-838 ◽  
Author(s):  
A Negrin
Keyword(s):  
Aqueous Solution ◽  
Sulfuric Acid ◽  
Spectrophotometric Method ◽  
Molybdic Acid ◽  
Concentrated Sulfuric Acid

Abstract A new spectrophotometric method for the determination of minute amounts of cholesterol in tissues is described. This method is a modification of the Yoshimatsu reaction which is based on the reduction of the yellow aqueous solution of phospho-6-tungstic-12-molybdic acid by a solution of cholesterol in concentrated sulfuric acid. The color of the resulting hydrosol of "molybdenum/tungsten blue" is particularly intense. The conditions for saponification confer virtual specificity for cholesterol. The proposed method is verified by comparison with estimates obtained by Abell’s procedure (9) as well as by the automated methodology of Block et al (8).

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.

A Simple and Effective Spectrophotometric Method for the Determination of Iron(III) with ResAcetophenone Guanylhydrazone (Rag)

2012 ◽  
Vol 3 (7) ◽  
pp. 54-55
Author(s):  
VITTHAL A DIVATE ◽  
◽  
PARAMANAND S MANOLI ◽  
SAVITA R DHONGADE
Keyword(s):  
Spectrophotometric Method

Extractive Spectrophotometric Method for the Determination of Glibenclamide by Ion-Pair Complex in Pure Form and Pharmaceutical Formulation

2019 ◽  
Vol 9 (o3) ◽  
Author(s):  
RUAA MUAYAD MAHMOOD ◽  
HAMSA MUNAM YASSEN ◽  
SAMAR , NAJWA ISSAC ABDULLA AHMED DARWEESH ◽  
NAJWA ISSAC ABDULLA
Keyword(s):  
Spectrophotometric Method ◽  
Molar Absorptivity ◽  
Ion Pair ◽  
Pharmaceutical Formulation ◽  
Ratio Method ◽  
Colored Complex ◽  
Colored Product ◽  
Method Of Continuous Variation ◽  
Job's Method

Simple, rapid and sensitive extractive spectrophotometric method is presented for the determination of glibenclamide (Glb) based on the formation of ion-pair complex between the Glb and anionic dye, methyl orange (MO) at pH 4. The yellow colored complex formed was quantitatively extracted into dichloromethane and measured at 426 nm. The colored product obeyed Beer’s law in the concentration range of (0.5-40) μg.ml-1. The value of molar absorptivity obtained from Beer’s data was found to be 31122 L.mol-1.cm-1, Sandell’s sensitivity value was calculated to be 0.0159 μg.cm-2, while the limits of detection (LOD) and quantification (LOQ) were found to be 0.1086 and 0.3292 μg.ml-1, respectively. The stoichiometry of the complex created between the Glb and MO was 1:1 as determined via Job’s method of continuous variation and mole ratio method. The method was successfully applied for the analysis of pharmaceutical formulation.

UV spectroscopic method for determination of phenytoin in bulk and injection forms

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Quality Control ◽  
Spectrophotometric Method ◽  
Spectroscopic Method ◽  
Ich Guidelines ◽  
Precision And Accuracy ◽  
Routine Quality Control

Recent study was conducted to develop a simple UV spectrophotometric method to determine Phenytoin in bulk and injection form according to official requirement and validate as per ICH guidelines. λmax of Phenytoin was found 202 nm. Linearity existed perceived in the concentration assortment 2-8 μg/ml (r2 = 0.999) for the method. The method was validated pertaining to linearity, precision and accuracy studies, LOD and LOQ consistent with ICH guidelines. The existent method was establish to be simple, linear, precise, accurate as well as sensitive and can be applied for routine quality control enquiry for the analysis of Phenytoin in bulk and injection form.

Sign in / Sign up

Export Citation Format

Share Document