scholarly journals THE DETERMINATION OF URANIUM BY METALLIC ZINC REDUCTION-DICHROMATE TITRATION. Analytical Report

1946 ◽  
Author(s):  
A.M. Ribley ◽  
M.G. Mellon ◽  
H. Hunt ◽  
T. DeVries ◽  
E.S. Gantz
Keyword(s):  
Metallic Zinc ◽  
Zinc Reduction

Colorimetric Determination of Arprinocid in Feed

1978 ◽  
Vol 61 (5) ◽  
pp. 1078-1082
Author(s):  
David W Fink ◽  
Kobert P Martin ◽  
James V Pivnichny ◽  
Jung-Sook K Shim
Keyword(s):  
Standard Deviation ◽  
Reaction Time ◽  
Analytical Method ◽  
Acidic Solution ◽  
Feed Additives ◽  
Colorimetric Determination ◽  
Colorimetric Measurement ◽  
Relative Standard ◽  
Zinc Reduction

Abstract An analytical method has been developed for the determination of arprinocid (9-(2-chloro- fluorophenylmethyl) -9ff-purin-6-amine) in feed, based upon measurement of the absorbance of the diazo chromophore formed from product of zinc reduction of the drug in acidic solution. The analyte is extracted from the feed into chloroform in the presence of a pH 7 phosphate buffer and isolated by adsorption chromatography on alumina, followed by partitioning between hexane and 0.15M HC1. The reduction product in the aqueous phase is then treated for colorimetric measurement. This procedure has been applied to determining 0.0010-0.0080% arprinocid in feed with precision of <5% relative standard deviation near the middle of this concentration range. Of 32 feed additives examined, only zoalene and sulfamethazine were serious interferences. study and discussion of several factors, e.g., reaction time, pH, and amount of zinc metal, that affect the analytical reactions are also included.

scholarly journals Determination of Metallic Zinc in Zinc Dust by Potassium Dichromate. I

1952 ◽  
Vol 73 (12) ◽  
pp. 895-896
Author(s):  
Hiromu Imai ◽  
Shigekazu Suehiro
Keyword(s):  
Zinc Dust ◽  
Potassium Dichromate ◽  
Metallic Zinc
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