Colorimetric Determination of Low Concentrations of Sodium Nitrate in Sodium Nitrite

1942 ◽  
Vol 14 (5) ◽  
pp. 420-422 ◽  
Author(s):  
William Seaman ◽  
A Norton ◽  
W Mader ◽  
J Hugonet
Keyword(s):  
Sodium Nitrite ◽  
Sodium Nitrate ◽  
Colorimetric Determination ◽  
Low Concentrations

Colorimetric Determination of Low Concentrations of Oxygen in Gases

1955 ◽  
Vol 27 (12) ◽  
pp. 2012-2014 ◽  
Author(s):  
C. Stafford ◽  
J. E. Puckett ◽  
M. D. Grimes ◽  
B. J. Heinrich
Keyword(s):  
Colorimetric Determination ◽  
Low Concentrations

Colorimetric Determination of Terbutaline Sulfate and Orciprenaline Sulfate via Nitrosation and Difference Spectrophotometry

1987 ◽  
Vol 70 (3) ◽  
pp. 568-571 ◽  
Author(s):  
Mohamed E El-Sadek ◽  
Hisham E Abdel Latef ◽  
Afaf A Aboul Khier
Keyword(s):  
Hydrochloric Acid ◽  
Sodium Nitrite ◽  
Colorimetric Method ◽  
Dosage Forms ◽  
Alkaline Media ◽  
Colorimetric Determination ◽  
Pharmaceutical Dosage Forms ◽  
Terbutaline Sulfate ◽  
The Difference

Abstract A colorimetric method is proposed for determination of terbutaline sulfate, orciprenaline sulfate, and their dosage forms. The suggested method depends on nitrosation of the 2 drugs by using sodium nitrite and hydrochloric acid. Addition of sodium hydroxide increases the intensity of the color developed. The difference between absorption values measured in acid and alkaline media is taken as a measure of concentration. Variables were carefully studied and optimized. Results for both compounds adhered to Beer's law over the range 2- 28 μg/mL. The method has proved to be accurate and precise for analysis of pharmaceutical dosage forms.

THE COLORIMETRIC DETERMINATION OF PLATINUM WITH 5-(p-DIMETHYLAMINOBENZYLIDENE)-RHODANINE

1963 ◽  
Vol 41 (3) ◽  
pp. 667-670 ◽  
Author(s):  
Frances E. Piercy ◽  
D. E. Ryan
Keyword(s):  
Ascorbic Acid ◽  
The Other ◽  
Colorimetric Determination ◽  
Platinum Metals ◽  
Low Concentrations ◽  
Fold Excess

5-(p-Dimethylaminobenzylidene)-rhodanine is used to determine 0.5 to 6 p.p.m. of platinum colorimetrically, after reduction of platinum IV with ascorbic acid. Platinum can be determined in the presence of a 10-fold excess of palladium; low concentrations of the other platinum metals, except rhodium, do not seriously interfere.

Colorimetric Determination of Low Concentrations of Dissolved Oxygen in Water

1955 ◽  
Vol 27 (9) ◽  
pp. 1401-1404 ◽  
Author(s):  
L. S. Buchoff ◽  
N. M Ingber ◽  
J. H. Brady
Keyword(s):  
Dissolved Oxygen ◽  
Colorimetric Determination ◽  
Low Concentrations

scholarly journals SPECTROPHOTOMETRIC METHODS FOR THE QUANTIFICATION OF CARISOPRODOL USING FERRIC CHLORIDE, O-PHENANTHROLINE, AND P-NITROANILINE, SODIUM NITRITE AS ANALYTICAL REAGENTS

2019 ◽  
pp. 384-390
Author(s):  
MURALI D ◽  
PURNA CHANDRA RAO G
Keyword(s):  
Correlation Coefficient ◽  
Ferric Chloride ◽  
Sodium Nitrite ◽  
Sodium Nitrate ◽  
Limit Of Detection ◽  
Colored Complex ◽  
Spectrophotometric Methods ◽  
Analytical Reagents ◽  
Optimized Conditions

Objective: The present study represents the development of two spectrophotometric methods for the determination of carisoprodol (CCP) in pure and formulations using ferric chloride, o-phenanthroline, and p-nitroaniline (PNA), sodium nitrate as analytical reagents. Methods: The proposed spectrophotometric methods were developed based on oxidation of Fe3+ by CCP, and then, the resultant product was reacted with o-phenanthroline in acidic condition forms an orange-colored complex and diazotization of PNA followed by coupling with CCP in an alkaline medium forms yellow-colored complex. Results: Under the optimized conditions, the absorbance of CCP concentration obeyed the Beer’s law in the ranges of 10–60 μg/mL with good correlation coefficient values of 0.9992 and 0.9990 with the limit of detection values of 1.286 and 2.408 μg/mL, respectively. Conclusion: The proposed methods were successfully applied for the determination of CCP in pure and in their formulations.

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