scholarly journals PHOTOMETRIC METHOD FOR THE QUANTITATIVE DETERMINATION OF LIME AND SULPHURIC ACID.1

1896 ◽  
Vol 18 (8) ◽  
pp. 661-670
Author(s):  
J. I. D. Hinds
Keyword(s):  
Quantitative Determination ◽  
Sulphuric Acid ◽  
Photometric Method

THE DETERMINATION OF ZIRCONIUM WITH BENZOYLPHENYLHYDROXYLAMINE

1960 ◽  
Vol 38 (12) ◽  
pp. 2488-2492 ◽  
Author(s):  
D. E. Ryan
Keyword(s):  
Hydrochloric Acid ◽  
Quantitative Determination ◽  
Sulphuric Acid ◽  
Rare Earths ◽  
Acid Solutions ◽  
Constant Composition ◽  
Hydrochloric Acid Solutions

Zirconium is completely precipitated by benzoylphenylhydroxylamine from 0.5 N acid solutions. The complex formed in sulphuric acid solutions has a constant composition, Zr(C13H10O2N)4, and is used for the direct weighing of zirconium; the factor is 0.0970. The product precipitated from hydrochloric acid solutions must be ignited to the oxide. The reaction is sensitive, 1 p.p.m. of zirconium being detectable, and quantitative determination of 0.2 mg is possible. Thorium and the rare earths do not interfere.

Extraction photometric method for the quantitative determination of metamizil in 0.25% solution for injection

1980 ◽  
Vol 14 (5) ◽  
pp. 350-353
Author(s):  
A. A. Bagdasaryan ◽  
L. S. Efimova ◽  
S. A. Minina ◽  
A. S. Bril'
Keyword(s):  
Quantitative Determination ◽  
Photometric Method

Quantitative Determination of Vanillin and Ethyl Vanillin in Flavors by Paper Chromatography

1964 ◽  
Vol 47 (6) ◽  
pp. 1161-1165
Author(s):  
J Fitelson
Keyword(s):  
Quantitative Determination ◽  
Paper Chromatography ◽  
Alkaline Solution ◽  
Chromatographic Separation ◽  
Chromatographic Method ◽  
Ultraviolet Absorption ◽  
Photometric Method ◽  
Absorption Method ◽  
Ethyl Vanillin

Abstract Previous methods for estimating vanillin and ethyl vanillin in mixtures were long and complicated. However, this paper presents a simple chromatographic separation and quantitative determination of these aromatics, using Mitchell equipment for paper chromatography and 8 × 8” papers. Development for 2 hours separates the compounds adequately; they are then extracted and measured by absorbances at 348 mμ in alkaline solution. Recoveries of added vanillin and ethyl vanillin to vanilla extract are excellent. Aside from normal manipulative errors, the only significant inaccuracy is caused by the small amount of natural p-hy-droxybenzaldehyde in vanilla (usually equivalent to about 5% of the vanillin content). The method does not separate p-hydroxybenzaldehyde and vanillin. Total errors in the method do not exceed 0.01%. Comparison of the method with the two AOAC methods for vanillin shows that the paper chromatographic method gives results close to those by the ultraviolet absorption method, in most cases, and significantly lower results than the photometric method, which is known to give erroneously high results.

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