Spectrophotometric determination of formaldehyde with chromotropic acid in phosphoric acid medium assisted by microwave oven

2004 ◽  
Vol 77 (1) ◽  
pp. 47-51 ◽  
Author(s):  
Andréa C Gigante ◽  
Mara A Gotardo ◽  
João O Tognolli ◽  
Leonardo Pezza ◽  
Helena R Pezza
Keyword(s):  
Phosphoric Acid ◽  
Acid Medium ◽  
Spectrophotometric Determination ◽  
Chromotropic Acid ◽  
Microwave Oven

Collaborative Study of the Spectrophotometric Determination of Procainamide Hydrochloride

1976 ◽  
Vol 59 (4) ◽  
pp. 807-810
Author(s):  
Jeffrey C Hamm
Keyword(s):  
Sodium Hydroxide ◽  
Acid Medium ◽  
Spectrophotometric Determination ◽  
Spectrophotometric Method ◽  
Collaborative Study ◽  
Dosage Forms ◽  
Standard Deviations

Abstract The USP analysis for procainamide HCl is titrimetric and relatively nonspecific, capsule and tablet dyes may interfere, and the method is not applicable to coated tablets. In the spectrophotofluorometric method the sample deteriorates when exposed to a xenon source. In the ultraviolet spectrophotometric method reported here, the sample is dispersed in acid medium, possible interferences are extracted in chloroform, base is added, procainamide is extracted in chloroform, the residue is dissolved in sodium hydroxide, and the compound is measured by absorption at 272 nm and comparison with a standard. Recoveries of standards added to capsule, tablet, and injection composites ranged from 99.3 to 102%. Twelve collaborators reported duplicate assay results for all 3 dosage forms with per cent standard deviations for 5 samples ranging from 1.01 to 1.27%. The method has been adopted as official first action.

Direct spectrophotometric determination of chromium by microwave-oven induced flow-injection analysis

1998 ◽  
Vol 374 (1) ◽  
pp. 61-66 ◽  
Author(s):  
Xiaoyuan Wu ◽  
Hui Zhao ◽  
Xingguo Chen ◽  
Zhide Hu ◽  
Zhengfeng Zhao ◽  
...  
Keyword(s):  
Spectrophotometric Determination ◽  
Flow Injection ◽  
Flow Injection Analysis ◽  
Microwave Oven ◽  
Induced Flow
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