Simultaneous determination of copper, mercury and lead by first-order derivative spectrophotometry using dithizone as reagent

1995 ◽  
Vol 118 (3-4) ◽  
pp. 249-256 ◽  
Author(s):  
Lata Mathew ◽  
Talasila Prasada Rao ◽  
Chonatumatom S. P. Iyer ◽  
Alathur D. Damodaran
Keyword(s):  
Simultaneous Determination ◽  
Derivative Spectrophotometry ◽  
Order Derivative ◽  
First Order ◽  
Determination Of Copper

scholarly journals Simultaneous Determination of the Textile Dyes in Industrial Effluents by First-Order Derivative Spectrophotometry

2009 ◽  
Vol 25 (4) ◽  
pp. 487-492 ◽  
Author(s):  
Vitor C. ALMEIDA ◽  
Alexandro M. M. VARGAS ◽  
Juliana C. GARCIA ◽  
Ervim LENZI ◽  
Cláudio C. OLIVEIRA ◽  
...  
Keyword(s):  
Simultaneous Determination ◽  
Industrial Effluents ◽  
Textile Dyes ◽  
Derivative Spectrophotometry ◽  
Order Derivative ◽  
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 High-performance liquid chromatography and derivative spectrophotometry for simultaneous determination of pravastatin and fenofibrate in the dosage form

2014 ◽  
Vol 64 (4) ◽  
pp. 433-446 ◽  
Author(s):  
Mohamed M. Hefnawy ◽  
Mostafa S. Mohamed ◽  
Mohammed A. Abounassif ◽  
Amer M. Alanazi ◽  
Gamal A. E. Mostafa
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Simultaneous Determination ◽  
High Performance ◽  
Particle Diameter ◽  
Second Order ◽  
Derivative Spectrophotometry ◽  
Order Derivative ◽  
Calibration Curves

Abstract High performance liquid chromatography (HPLC) and second-order derivative spectrophotometry have been used for simultaneous determination of pravastatin (PS) and fenofibrate (FF) in pharmaceutical formulations. HPLC separation was performed on a phenyl HYPERSIL C18 column (125 mm × 4.6 mm i.d., 5 μm particle diameter) in the isocratic mode using a mobile phase acetonitrile/0.1 % diethyl amine (50:50, V/V, pH 4.5) pumped at a flow rate of 1.0 mL min-1. Measurement was made at 240 nm. Both drugs were well resolved on the stationary phase, with retention times of 2.15 and 5.79 min for PS and FF, respectively. Calibration curves were linear (R = 0.999 for PS and 0.996 for FF) in the concentration range of 5-50 and 20-200 µg mL-1 for PS and FF, respectively. Pravastatin and fenofibrate were quantitated in combined preparations also using the second-order derivative response at 237.6 and 295.1 nm for PS and FF, respectively. Calibration curves were linear, with the correlation coefficient R = 0.999 for pravastatin and fenofibrate, in the concentration range of 5-20 and 3-20 µg mL-1 for PS and FF, respectively. Both methods were fully validated and compared, the results confirmed that they were highly suitable for their intended purpose.

scholarly journals Application of Derivative Spectrophotometry for Simultaneous Determination of Quinapril and Hydrochlorothiazide in the Combination Tablets

2004 ◽  
Vol 87 (4) ◽  
pp. 847-851 ◽  
Author(s):  
Dorota Kowalczuk ◽  
Hanna Hopkała
Keyword(s):  
Standard Deviation ◽  
Simultaneous Determination ◽  
Relative Standard Deviation ◽  
Spectrophotometric Method ◽  
Derivative Spectrophotometry ◽  
Order Derivative ◽  
Zero Crossing ◽  
Relative Standard ◽  
Separation Of Components

Abstract A new second-order-derivative spectrophotometric method using zero-crossing technique measures quinapril (QUI) and hydrochlorothiazide (HYD) in 2-component mixtures. The procedure does not require prior separation of components from the sample. QUI was determined at a wavelength of 211.6 nm (zero-crossing wavelength point of HYD). Similarly, HYD was measured at 270.8 nm (zero-crossing wavelength point of QUI). Calibration graphs were constructed over the concentration range of 4.0 to 24.0 μ/mL for QUI and 2.5 to 15.0 μg/mL for HYD. Detection and quantitation limits were 0.85 and 2.5 μg/mL for QUI and 0.12 and 0.4 μg/mL for HYD, respectively. The accuracy (recovery 100.5–102%), precision (relative standard deviation less than 3.5% for QUI and 1.5% for HYD), selectivity, and sensitivity of the elaborated methods were satisfactory. The proposed method was applied successfully for the determination of both drugs in QUI-HYD tablets.

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
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