scholarly journals Spectrophotometric determination of peroxydisulphate with o-dianisidine by flow injection

1990 ◽  
Vol 68 (10) ◽  
pp. 1750-1756 ◽  
Author(s):  
Paul M. Shiundu ◽  
Adrian P. Wade ◽  
S. B. Jonnalagadda
Keyword(s):  
Spectrophotometric Determination ◽  
Flow Injection ◽  
Spectrophotometric Method ◽  
Ion Concentration ◽  
Injection Method ◽  
Absorbance Maximum ◽  
Accurate Knowledge ◽  
Stable Product

Precise and accurate knowledge of peroxydisulfate ion concentration is critical in industrial polymer production, where it is extensively used as an activator. Its ability to oxidize in either acidic, neutral, or alkali media also makes it widely applicable in many other areas of chemistry.In this paper we present an optimized spectrophotometric flow injection method for determination of peroxydisulfate. The analyte oxidizes o-dianisidine to form a stable product which has a convenient absorbance maximum at 450 nm. This provides a simple and sensitive alternative to present methods which are more costly, tedious, or complex. Keywords: spectrophotometric method, peroxydisulphate.

Spectrophotometric Determination of Aminacrine Hydrochloride in Creams, Jellies, and Suppositories: Interlaboratory Study

1987 ◽  
Vol 70 (3) ◽  
pp. 560-565
Author(s):  
Elaine A Bunch
Keyword(s):  
Thin Layer ◽  
Spectrophotometric Determination ◽  
Spectrophotometric Method ◽  
Coefficient Of Variation ◽  
Visible Spectrum ◽  
Interlaboratory Study ◽  
Commercial Products ◽  
Absorbance Maximum

Abstract A previously reported visible spectrophotometric method for the analysis of aminacrine hydrochloride in creams, jellies, and suppositories was studied collaboratively by 8 laboratories. Aminacrine hydrochloride was extracted into acidic ethanol and its visible spectrum recorded. The amount present was calculated by determining the net absorbance between the absorbance maximum at about 402 nm and one-half the sum of the absorbance of the minima at about 389 and 412 nm. Each collaborator received 4 creams (0.2%), 1 jel (0.2%), 1 molded suppository (6 mg/3.198 g), and 2 gelatin-encapsulated suppository samples (12 mg/6.661 g and 14 mg/6.863 g). The cream samples included blind duplicates prepared to contain 0.212% aminacrine hydrochloride, 15% sulfanilamide, and 2% allantoin. Mean recovery for the authentic cream was 104.7% with a coefficient of variation (CV) of 9.22%. The commercial products contained these respective amounts (CVs): creams, 100.0% (2.48%) and 101.5% (2.16%); jel, 118.0% (9.58%); molded suppository, 102.7% (1.88%); and gelatin encapsulated suppositories, 93.1% (1.0%) and 94.3% (1.60%). Standard aminacrine hydrochloride provided for the study was 99.6% pure by nonaqueous titration. Thin layer chromatographic identification of aminacrine hydrochloride was also tested collaboratively. The method was not adopted by AOAC.

Simple flow injection method for simultaneous spectrophotometric determination of Fe(II) and Fe(III)

2011 ◽  
Vol 702 (2) ◽  
pp. 213-217 ◽  
Author(s):  
J. Kozak ◽  
N. Jodłowska ◽  
M. Kozak ◽  
P. Kościelniak
Keyword(s):  
Spectrophotometric Determination ◽  
Flow Injection ◽  
Injection Method ◽  
Simple Flow

scholarly journals Flow injection- Spectrophotometric determination of some catecholamine drugs

2005 ◽  
Vol 2 (1) ◽  
pp. 124-130
Author(s):  
Baghdad Science Journal
Keyword(s):  
Spectrophotometric Determination ◽  
Flow Injection ◽  
Injection Method

A new spectrophotometric flow injection method has been establish for the determintaions of some catecholaminedrugs

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