scholarly journals ALKALINE-PEROXIDE COLORIMETRIC METHODS FOR THE DETERMINATION OF URANIUM.

1966 ◽  
Author(s):  
H.F. Waldron
Keyword(s):  
Alkaline Peroxide ◽  
Colorimetric Methods

Determination of Cobalt in Fertilizers

1965 ◽  
Vol 48 (2) ◽  
pp. 412-415
Author(s):  
J F Hodgson ◽  
Victor A Lazar
Keyword(s):  
Colorimetric Method ◽  
Isoamyl Acetate ◽  
Acid Mixture ◽  
Acid And Base ◽  
Colorimetric Methods

Abstract Cobalt in fertilizers was determined by a colorimetric method using 2-nitroso-l-naphthol. With this method the fertilizer is digested with a ternary acid mixture; cobalt is then extracted from a suitable aliquot into isoamyl acetate at pH 8.5 with an excess of 2-nitroso-l-naphthol. Excess dye and interferences are removed by successive washes with acid and base. A limited number of collaborator analyses indicate that agreement of results is not as satisfactory as might be expected with the major fertilizer constituents. However, collaborator agreement compares favorably with other methods of analyses accepted by the AOAC for Co. While the procedure is considered tedious by some collaborators, it is believed to be less tedious and less subject to interferences than other colorimetric methods available.

Colorimetric and Gas-Liquid Chromatographic Determination of Atropine-Hyoscyamine and Hyoscine (Scopolamine) in Solanaceous Plants

1975 ◽  
Vol 58 (5) ◽  
pp. 884-887
Author(s):  
Mohamed S Karawya ◽  
Samia M Abdel-Wahab ◽  
Mohamed S Hifnawy ◽  
Mohamed G Ghourab
Keyword(s):  
Citric Acid ◽  
Acetic Anhydride ◽  
Thin Layer ◽  
Chromatographic Determination ◽  
Chromatographic Procedure ◽  
Liquid Chromatographic Determination ◽  
Solanaceous Plants ◽  
Liquid Chromatographic ◽  
Colorimetric Methods

Abstract Two colorimetric micromethods are described for the determination of atropine-hyoscyamine and hyoscine (scopolamine), using p-dimethylaminobenzaldehyde and citric acid-acetic anhydride as the color reagents. These methods are sensitive to 60-1200 and 10-360 μg alkaloid/10 ml. The colorimetric methods were also successfully applied after a preliminary thin layer chromatographic separation of the alkaloids. A gasliquid chromatographic procedure was also developed, which yielded comparable results with the colorimetric methods.

Colorimetric Determination of Certain Phenol Derivatives in Pharmaceutical Preparations

1981 ◽  
Vol 64 (6) ◽  
pp. 1442-1445
Author(s):  
Sayed M Hassan ◽  
Mohammed I Walash ◽  
Sanaa M El-Sayed ◽  
Abdel Malek Abou Ouf
Keyword(s):  
Pharmaceutical Preparations ◽  
Sulfanilic Acid ◽  
Diazonium Salts ◽  
Colorimetric Determination ◽  
Reaction Products ◽  
Optimum Conditions ◽  
Phenol Derivatives ◽  
The Mean ◽  
Colorimetric Methods

Abstract Simple colorimetric methods are reported for determining both acetaminophen and oxyphenbutazone. These methods are based on coupling between the phenolic compound and the diazonium salts of both sulfanilic acid and p-nitroaniline; the optimum conditions for the reactions were carefully studied. For acetaminophen, the reaction products with diazosulfanilic acid and diazo-p-nitroaniline show maximum absorbance at 480 and 425 nm, respectively. The mean percentage recoveries for authentic samples were 99.5 ± 1.1 and 100.6 ± 0.66, respectively (P = 0.05). For oxyphenbutazone, the obtained colors showed maxima at 385 nm with diazosulfanilic acid and 490 nm with diazo-p-nitroaniline reactions. The mean percentage recoveries for authentic samples were 99.8 ± 0.27 and 100.1 ± 0.57, respectively (P = 0.05). The proposed methods were successfully applied to the analysis of commercial preparations; results were statistically compared with those of other methods.

Rapid Determination of Phosphorus in Gasoline. Spectrographic and Colorimetric Methods

1960 ◽  
Vol 32 (3) ◽  
pp. 374-379 ◽  
Author(s):  
M. E. Griffing ◽  
C. T. Leacock ◽  
W. R. O'Neill ◽  
A. L. Rozek ◽  
G. W. Smith
Keyword(s):  
Rapid Determination ◽  
Colorimetric Methods

Application of some colorimetric methods for the spectrophotometric determination of phenylbutazone and oxyphenbutazone

Talanta ◽  
1985 ◽  
Vol 32 (8) ◽  
pp. 657-658 ◽  
Author(s):  
A.S. Issa ◽  
Y.A. Beltagy ◽  
M.Gabr Kassem ◽  
H.S. Daabees
Keyword(s):  
Spectrophotometric Determination ◽  
Colorimetric Methods
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