scholarly journals The quantitative determination of barbiturates in tissues by ultraviolet absorption spectrophotometry

1949 ◽  
Vol 44 (4) ◽  
pp. 501-505 ◽  
Author(s):  
G. V. R. Born
Keyword(s):  
Quantitative Determination ◽  
Ultraviolet Absorption ◽  
Absorption Spectrophotometry

Perchlorate in Sea Water

1961 ◽  
Vol 41 (1) ◽  
pp. 175-186 ◽  
Author(s):  
R. Greenhalgh ◽  
J. P. Riley
Keyword(s):  
Aqueous Solution ◽  
Quantitative Determination ◽  
Water Sample ◽  
Coefficient Of Variation ◽  
Sea Water ◽  
Absorption Spectrophotometry ◽  
Infra Red ◽  
Tetraphenylarsonium Chloride

The use of tetraphenylarsonium chloride for the detection and determination of perchlorate in sea water has been investigated. An aqueous solution of this reagent gives a visible precipitate of tetraphenylarsonium perchlorate with sea water containing 5 μg ClO4-/ml. within 10 min. For the quantitative determination of traces of perchlorate, potassium perrhenate is added to the water sample, and the tetraphenylarsonium perrhenate, which is precipitated by addition of the reagent, co-precipitates tetraphenylarsonium perchlorate. Perchlorate is determined in the mixed precipitate by infra-red absorption spectrophotometry. Using 100 ml. of sea water, a sensitivity of 0·03 μg ClO4-/ml. can be attained, with a coefficient of variation of ca. 10%. No interference is caused by the ions normally present in sea water.

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.

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