Simultaneous determination of equilibrium and rate constants for first-order reactions

1971 ◽  
Vol 75 (3) ◽  
pp. 430-431 ◽  
Author(s):  
William D. Huntsman ◽  
Johnson C. H. Chen
Keyword(s):  
Simultaneous Determination ◽  
Rate Constants ◽  
First Order

scholarly journals UV Spectrophotometric Simultaneous Determination of Paracetamol and Ibuprofen in Combined Tablets by Derivative and Wavelet Transforms

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Vu Dang Hoang ◽  
Dong Thi Ha Ly ◽  
Nguyen Huu Tho ◽  
Hue Minh Thi Nguyen
Keyword(s):  
Simultaneous Determination ◽  
Wavelet Transforms ◽  
Hybrid Approach ◽  
Uv Spectra ◽  
Order Derivative ◽  
First Order ◽  
Spectrophotometric Methods ◽  
Combined Use ◽  
Linear Concentration

The application of first-order derivative and wavelet transforms to UV spectra and ratio spectra was proposed for the simultaneous determination of ibuprofen and paracetamol in their combined tablets. A new hybrid approach on the combined use of first-order derivative and wavelet transforms to spectra was also discussed. In this application, DWT (sym6 and haar), CWT (mexh), and FWT were optimized to give the highest spectral recoveries. Calibration graphs in the linear concentration ranges of ibuprofen (12–32 mg/L) and paracetamol (20–40 mg/L) were obtained by measuring the amplitudes of the transformed signals. Our proposed spectrophotometric methods were statistically compared to HPLC in terms of precision and accuracy.

scholarly journals Simultaneous determination of gatifloxacin and prednisolone acetate in ophthalmic formulation using first-order UV derivative spectroscopy

2017 ◽  
Vol 10 (5) ◽  
pp. 604-610 ◽  
Author(s):  
Rúbia A. Sversut ◽  
Isabella C. Alcântara ◽  
Aline M. Rosa ◽  
Adriano C.M. Baroni ◽  
Patrik O. Rodrigues ◽  
...  
Keyword(s):  
Simultaneous Determination ◽  
Prednisolone Acetate ◽  
First Order ◽  
Derivative Spectroscopy ◽  
Ophthalmic Formulation

Simultaneous Determination of Tramadol and Ibuprofen in Pharmaceutical Preparations by First Order Derivative Spectrophotometric and LC Methods

2008 ◽  
Vol 68 (9-10) ◽  
pp. 843-847 ◽  
Author(s):  
A. B. Thomas ◽  
N. G. Dumbre ◽  
R. K. Nanda ◽  
L. P. Kothapalli ◽  
A. A. Chaudhari ◽  
...  
Keyword(s):  
Simultaneous Determination ◽  
Pharmaceutical Preparations ◽  
Order Derivative ◽  
First Order

An analytical method for determining rate constants using a periodical irradiation technique

1969 ◽  
Vol 47 (24) ◽  
pp. 4531-4535 ◽  
Author(s):  
W. Kawakami ◽  
H. S. Isbin
Keyword(s):  
Rate Constants ◽  
Analytical Method ◽  
Apparent Rate Constant ◽  
Chloral Hydrate ◽  
Life Time ◽  
First Order ◽  
Radical Concentration ◽  
Γ Rays ◽  
The Mean

A new analytical method is presented for the determination of rate constants using a periodical irradiation technique. This method is applicable to reactions which have both a first and a second order termination for the chain radical concentration, and is illustrated for the radiolysis of aqueous solutions of chloral hydrate by 137Cs γ rays. The apparent rate constant of first order termination, and the mean chain life time of the chain radical were determined to be 1.10 s−1, and 0.25 s for 400 rad/min, at 22 °C, respectively.

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