scholarly journals Spectral Study of 1,4-bis(3-(2-pyridyl)pyrazol-1-ylmethyl)benzene (PPB): UV-VIS Absorption Spectra Investigation in Single and Binary Solvents and Spectrophotometric Determination of the Dissociation Constant (pKb)

2016 ◽  
Vol 12 (1) ◽  
pp. 67-82
Author(s):  
Khaled Elsherif ◽  
Hanan Shuwat ◽  
Adel Najar
Keyword(s):  
Dissociation Constant ◽  
Absorption Spectra ◽  
Spectrophotometric Determination ◽  
Spectral Study ◽  
Binary Solvents

scholarly journals ALTERNATIVE CALIBRATION SYSTEMS FOR THE SIMULTANEOUS SPECTROPHOTOMETRIC DETERMINATION OF COMPOUNDS WITH OVERLAPPING ABSORPTION SPECTRA

Química Nova ◽  
2015 ◽  
Author(s):  
Sandra Stets ◽  
Barbara Duarte da Silva ◽  
Talita Maria Tavares ◽  
Gilcélia A. Cordeiro ◽  
Noemi Nagata ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Spectrophotometric Determination

Spectrophotometric Determination of Some Preservatives in Milk

1977 ◽  
Vol 60 (5) ◽  
pp. 1175-1179
Author(s):  
Abdel-Aziz M Wahbi ◽  
Hassan Abdine ◽  
Salah M Blaih
Keyword(s):  
Benzoic Acid ◽  
Absorption Spectra ◽  
Spectrophotometric Determination ◽  
Sorbic Acid ◽  
Percentage Error ◽  
Milk Samples ◽  
First Derivative

Abstract Benzoic acid, propyl p-hydroxybenzoate, and sorbic acid in milk have been determined by using the corresponding first derivative curves of absorption spectra of clarified milk samples. The ΔA/Δλ curves were computed and the concentration of each preservative was calculated using 1 point, 2 points, and/or 3 points. In all cases, the percentage error was within 2.4%.

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