Cationic surfactant as a sensitizer for the spectrophotometric determination of hydrogen sulphide in air and evaluation of a new absorbing medium containing triethanolamine-zinc acetate-sodium hydroxide

1996 ◽  
Vol 94 (3) ◽  
pp. 255-260 ◽  
Author(s):  
M. Pandurangappa ◽  
N. Balasubramanian
Keyword(s):  
Sodium Hydroxide ◽  
Cationic Surfactant ◽  
Spectrophotometric Determination ◽  
Hydrogen Sulphide ◽  
Zinc Acetate ◽  
Absorbing Medium

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.

A transparent membrane filter for the solid-phase spectrophotometric determination of trace cationic surfactant in water

The Analyst ◽  
1999 ◽  
Vol 124 (10) ◽  
pp. 1489-1492 ◽  
Author(s):  
S. Taguchi ◽  
K. Morisaku ◽  
Y. Sengoku ◽  
I. Kasahara
Keyword(s):  
Cationic Surfactant ◽  
Spectrophotometric Determination ◽  
Solid Phase ◽  
Membrane Filter

Spectrophotometric Determination of Maleic Hydrazide in Tobaccos

1961 ◽  
Vol 44 (4) ◽  
pp. 723-725
Author(s):  
I Hoffman
Keyword(s):  
Sodium Hydroxide ◽  
Spectrophotometric Determination ◽  
Plant Material ◽  
Maleic Hydrazide ◽  
Sodium Hydroxide Solution ◽  
Important Regulator ◽  
Increased Sensitivity ◽  
The Stability ◽  
Empirical Constants

Abstract Maleic hydrazide (6-hydroxy-3-(2H) pyridazinone) has properties that make it an important regulator for the control of sucker growth in tobacco. The stability and persistence of maleic hydrazide in plants was reviewed by Smith and co-workers (3). Several procedures have been reported for its determination in plant material (1, 2, 4) but these have proved to be unsatisfactory when applied to tobacco. This failure is due primarily to the strong red interfering color which results when tobacco in sodium hydroxide solution is distilled with added zinc. The reported procedures attempt to minimize this interference by the use of empirical constants and absorbance ratio factors. This paper outlines a modified procedure of greatly increased sensitivity which removes the interference entirely, and which is applicable to various types of tobacco tested (flue-cured, cigar, burley, and aromatic)

scholarly journals Spectrophotometric Determination of Ascorbic Acid with Iron(III) and p-Carboxyphenylfluorone in a Cationic Surfactant Micellar Medium.

2001 ◽  
Vol 17 (7) ◽  
pp. 853-857 ◽  
Author(s):  
Yoshikazu FUJITA ◽  
Itsuo MORI ◽  
Takako YAMAGUCHI ◽  
Mitsuru HOSHINO ◽  
Yasuyuki SHIGEMURA ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Cationic Surfactant ◽  
Spectrophotometric Determination ◽  
Micellar Medium
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