Determination of Mono-, Di-, and Trichloramine by Ultraviolet Absorption Spectrophotometry

1961 ◽  
Vol 33 (6) ◽  
pp. 705-707 ◽  
Author(s):  
E. J. Levy ◽  
W. A. Stahl
Keyword(s):  
Ultraviolet Absorption ◽  
Absorption Spectrophotometry

Ultraviolet Absorption Spectrophotometry Method for the Determination of Morphine in Paregoric

1968 ◽  
Vol 51 (6) ◽  
pp. 1309-1314
Author(s):  
Futoshi Takazawa
Keyword(s):  
Spectrophotometric Method ◽  
Extraction Procedure ◽  
Ultraviolet Absorption ◽  
Factors Affecting ◽  
Absorption Spectrophotometry ◽  
Precision And Accuracy

Abstract An ultraviolet absorption spectrophotometric method is described for the determination of morphine in paregoric. Morphine is isolated from a 5 ml paregoric sample by a modification of the USP XVII extraction procedure and then measured by ultraviolet absorption spectrophotometry. Factors affecting the precision and accuracy of the method are discussed.

Determination of Minor Nutrients in Fertilizers by Atomic Absorption Spectrophotometry: Second Collaborative Study

1965 ◽  
Vol 48 (6) ◽  
pp. 1100-1103
Author(s):  
C H Mcbride
Keyword(s):  
Atomic Absorption ◽  
Collaborative Study ◽  
Atomic Absorption Spectrophotometry ◽  
Absorption Method ◽  
Atomic Absorption Method ◽  
Absorption Spectrophotometry ◽  
Minor Nutrients

Abstract The atomic absorption method studied last year was re-examined and extended to include calcium and sodium. The procedures were submitted to 16 collaborators for determination of Ca, Cu, Fe, Mg, Mn, Na, and Zn. Results for Ca and Na were discouraging; further study is recommended.

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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