Determination of Micro-Amount of Selenium and Tellurium by the Oxidation with Iodine Monochloride-Hydrochloric Acid Solution and the Titration with Potassium Iodate

1964 ◽  
Vol 85 (10) ◽  
pp. 647-651,A51 ◽  
Author(s):  
Akira KISHIOKA ◽  
Iwaji IWASAKI ◽  
Yukito YOSHIDA
Keyword(s):  
Hydrochloric Acid ◽  
Acid Solution ◽  
Hydrochloric Acid Solution ◽  
Iodine Monochloride ◽  
Potassium Iodate

Determination of p-Aminobenzoic Acid in Feeds

1964 ◽  
Vol 47 (2) ◽  
pp. 214-218
Author(s):  
Richard T Merwin
Keyword(s):  
Hydrochloric Acid ◽  
Acid Solution ◽  
Hydrochloric Acid Solution ◽  
Alkaline Hydrolysis ◽  
Spectrophotometric Assay ◽  
Aminobenzoic Acid ◽  
Drug Content ◽  
Collaborative Studies ◽  
Qualitative Test

Abstract Collaborative studies were conducted on a revised method for p-aminobenzoic acid (PABA) in feeds. PABA is diazotized and coupled with N-1-naphthylethylenediamine dihydrochloride to form a red complex that provides both a qualitative test and a spectrophotometric assay. The PABA is extracted with a 10% hydrochloric acid solution and the alkaline hydrolysis step is eliminated. Results were close to the labeled drug content, although the aged feed evidenced drug instability. The revised method is recommended for adoption as official, first action.

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