doi: 10.1080/00032718008077992pmid: N/A
Abstract This is a scanned image of the original Editorial Board page(s) for this issue.
Ionescu, Mariana S.; Cosofret, Vasile V.; Panaitescu, Thea; Costescu, Mihaela
doi: 10.1080/00032718008077993pmid: N/A
Abstract The conditions for the determination of sodium thiophosphate and sodium S-(2-amino-ethyl)-thiophos-phate in the presence of phosphate ion using ion-selective membrane electrodes are described. Both thiophosphates (inorganic and organic) are hydrolyzed in acidic medium. The phosphate ion is determined with Pb(II) using a Pb2+ – selective membrane electrode. Cysteamine is determined by potentiometric titration with Hg(I1) using a Ag+/S2− – crystal membrane electrode or by direct potentiometry with a Cu2+ selective membrane electrode. The results were verified by the iodination method.
Benkö, András B.; Mann, Veronika
doi: 10.1080/00032718008077994pmid: N/A
Abstract A comparison of different silylating agents was conducted by gas-chromatography, using methandienon e(17α-methyl-androsta-1, 4-dien-17β-ol-3-one) as a model substance for steroids with hindered hydroxyl groups. A very significant catalytic effect of methoxy-amine on the reactions was found with all examined silylating agents. A 100% yield was found using N-trimethylsilyl-imidazole in combination with the catalyst in an “on-column” reaction.
Kimura, Keiichi; Nakajima, Masaki; Shono, Toshiyuki
doi: 10.1080/00032718008077995pmid: N/A
Abstract Poly(crown ether), which possesses an attractive cation-binding ability, as well as the corresponding monocyclic crown ether has been immobilized on silica by a covalent bonding. The chromatographic behavior of the modified silicas for alkali metal salts is demonstrated. The poly(crown ether)-modified silica provided much better separation of the metal salts compared to the corresponding monocyclic crown ether-modified one.
Funazo, Koichi; Kusano, Kenji; Tanaka, Minoru; Shono, Toshiyuki
doi: 10.1080/00032718008077996pmid: N/A
Abstract A new gas chromatographic method is described for the determination of cyanide ion in water. Cyanide is converted to benzonitrile by reaction with aniline, sodium nitrite, and copper(II) sulfate. The resulting benzonitrile is extracted into chloroform and determined by gas chromatography with a flame ionization detector. The influences of several ions which may coexist with cyanide on this gas chromatographic method were investigated briefly.
Thenot, J-P.; Ruo, T. I.; Bouwsma, O. J.
doi: 10.1080/00032718008077997pmid: N/A
Abstract Secondary amines are formylated by dimethylformamide dimethylacetal, contradicting recent reports on the ethylation of secondary amines by this reagent. This explains why a single derivative is obtained regardless of the alkyl acetal that is used. These formyl derivatives, also formed by reaction with formic acid, are eluted later than the starting material or the corresponding ethyl derivative. Deuterated imipramine and related antidepressants can be prepared by reducing the formyl derivative of the appropriate desalkyl compound with lithium aluminum deuteride.
doi: 10.1080/00032718008077998pmid: N/A
Abstract Sensitive fluorometric procedure has been developed for the determination of nitrate with resorcinol. Reaction conditions, sensitivity of the method and the effect of nitrite are discussed. It is possible to determine 5 to 70 ng of nitrate-nitrogen by the recommended method.
Vickrey, Thomas M.; Harrison, Gabrielle V.; Ramelow, Gerald J.; Carver, James C.
doi: 10.1080/00032718008077999pmid: N/A
Abstract Organotin compounds are analyzed by graphite furnace atomic absorption (GFAA) spectrometry. The graphite cuvette furnaces which were used were treated chemically with solutions containing V, Mo, Cr, and Zr. The zirconium treatment shows the greatest reduction in atomization interferences for the analysis of tin. The tin atomic absorption signals observed for the organotin compounds can be directly compared t o the aqueous tin standard, in terms of sensitivity.
doi: 10.1080/00032718008078000pmid: N/A
Abstract A coprecipitation method for concentrating amino acids from aquatic environments with a mixed hydroxide of iron(III) and copper(II) was developed. The percent coprecipitation of glycine, alanine, glutamic acid, aspartic acid, and lysine, being independent of pH in the range of 8.5 to 9.5, was more than 95%.
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