Spectrophotometric and first-derivative spectrophotometric determination of cadmium witho-hydroxybenzenediazoaminoazobenzene (HDAA)

1989 ◽  
Vol 97 (5-6) ◽  
pp. 313-320 ◽  
Author(s):  
Chung-Gin Hsu ◽  
Wei Wang ◽  
Li-Ping Yang ◽  
Jiao-Mai Pan ◽  
Yu-Fang Wang
Keyword(s):  
Spectrophotometric Determination ◽  
First Derivative

Simultaneous Spectrophotometric Determination of Nifuroxime and Furazolidone in Pharmaceutical Preparations

1980 ◽  
Vol 63 (5) ◽  
pp. 992-995
Author(s):  
Laila Elsayed ◽  
Sayed M Hassan ◽  
Khadiga M Kelani ◽  
Hamed M El-Fatatry
Keyword(s):  
Simultaneous Determination ◽  
Spectrophotometric Determination ◽  
Pharmaceutical Preparations ◽  
Spectrophotometric Methods ◽  
First Derivative ◽  
Separation Step ◽  
Preliminary Separation

Abstract Two spectrophotometric methods have been developed for the simultaneous determination of nifuroxime and furazolidone in their pharmaceutical preparations. No preliminary separation step is required in either method. The first, a modified Vierordt method, gives accurate and reproducible results for both drugs. Mean percent recoveries for nifuroxime and furazolidone were 99.50 ±1.59 and 100.20 ±1.16 (P = 0.05), respectively. This method also gives accurate and reproducible results for the determination of nifuroxime and furazolidone in their pharmaceutical preparations: Tricofuran vaginal suppositories and powder. The second method, which involves the use of the first-derivative curves, gives unreliable results; the reasons for these are discussed.

First-derivative solid-phase spectrophotometric determination of molybdenum at the ng ml level

Talanta ◽  
1996 ◽  
Vol 43 (2) ◽  
pp. 185-191 ◽  
Author(s):  
A MOLINADIAZ ◽  
M PASCUALREGUERA ◽  
E LINANVEGANZONES ◽  
M FERNANDEZDECORDOVA ◽  
L CAPITANVALLVEY
Keyword(s):  
Spectrophotometric Determination ◽  
Solid Phase ◽  
First Derivative

First-derivative spectrophotometric determination of salicylic acid in aspirin

Talanta ◽  
1989 ◽  
Vol 36 (11) ◽  
pp. 1117-1121 ◽  
Author(s):  
Abdel-Aziz ◽  
M. Wahbi ◽  
Hamad A. Al-Khamees ◽  
Ahmad M.A. Youssef
Keyword(s):  
Salicylic Acid ◽  
Spectrophotometric Determination ◽  
First Derivative

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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