Search

Your search keyword '"Shahnaz Parveen"' showing total 3 results
Start Over Author "Shahnaz Parveen" Publication Year Range More than 50 years ago
3 results on '"Shahnaz Parveen"'

2. Microdetermination of Xanthates

Author

M. Sarwar, Iftikhar Ahmad, R.J. Thibert, and Shahnaz Parveen Hamdani

Subjects
chemistry.chemical_compound, Dixanthogen, chemistry, Potassium, Inorganic chemistry, Relative standard deviation, chemistry.chemical_element, Xanthate, Iodine, Analytical Chemistry
Abstract

A rapid, convenient and accurate method for the determination of xanthates has been developed. N-bromosuccinimide has been used to displace iodine from potassium iodide which in turn oxidizes xanthate to dixanthogen. The pH 4 is optimum for the determination. The maximum relative standard deviation is 6% in the case of ethyl potassium xanthate when a 0.5 mg sample was taken.

Published
1971

3. Semiquantitative determination of alkaloids by circular thin-layer chromatography

Author

N. A. Chughtai, Shahnaz Parveen, and M. H. Hashmi

Subjects
Papaverine, Chromatography, Brucine, Chemistry, Cinchonine, Strychnine, Thin-layer chromatography, Analytical Chemistry, chemistry.chemical_compound, Ajmaline, Semiquantitative Method, medicine, Ephedrine, medicine.drug
Abstract

A semiquantitative method for the determination of 13 alkaloids (nicotine, quinine, strychnine, brucine, ephedrine, pilocarpine, narcotine, cinchonine, ajmaline, atropine, cocaine, papaverine and morphine) from a single drop of solution by making “circular spots” on chromatoplate with the circular thin-layer Chromatographic apparatus and their comparison with sensitivity standard has been developed. The accuracy is ±5% and the procedure is rapid, simple and economical.

Published
1969

Catalog

Books, media, physical & digital resources
See catalog results