scholarly journals The Spectrophotometric Determination of Anions by Solvent Extraction with Metal Chelate Cations. XLI. Indirect Determination of β-Hydroxynaphthoic Acid by Atomic Absorption Spectrophotometry

1969 ◽  
Vol 42 (6) ◽  
pp. 1774-1775 ◽  
Author(s):  
Yuroku Yamamoto ◽  
Takahiro Kumamaru ◽  
Yasuhisa Hayashi ◽  
Susumu Matsushita
Keyword(s):  
Solvent Extraction ◽  
Atomic Absorption ◽  
Spectrophotometric Determination ◽  
Metal Chelate ◽  
Atomic Absorption Spectrophotometry ◽  
Indirect Determination ◽  
Absorption Spectrophotometry ◽  
Determination Of Anions

Comparison of Methods for Determining Biuret in Urea

1979 ◽  
Vol 62 (1) ◽  
pp. 153-159
Author(s):  
Luis F Corominas ◽  
Victor M Boy ◽  
Manuel Guijosa
Keyword(s):  
Atomic Absorption ◽  
Spectrophotometric Determination ◽  
Atomic Absorption Spectrophotometry ◽  
International Organization ◽  
Comparison Of Methods ◽  
Definite Advantage ◽  
Absorption Spectrophotometry ◽  
Alternative Procedures ◽  
Aoac Method

Abstract The official first action AOAC method for the spectrophotometric determination of biuret in urea, 2.072—2.074, was compared with official first action AOAC method 2.C01-2.C03 (atomic absorption spectrophotometry), 2 simplified versions of 2.072-2.074, and modified versions of 2 alternative procedures of the International Organization for Standardization. Three synthetic urea samples (0.3, 1.4, and 3.0% biuret) and 1 commercial urea sample (1.0% biuret) were analyzed. The methods proved to be equivalent and none showed a definite advantage over 2.072-2.074. The purification of biuret and the interference by ammonia are also discussed.

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