Zobrazeno 1 - 10
of 104
pro vyhledávání: '"Z. Štefanac"'
Publikováno v:
Microchemical Journal. 19:37-41
A simple and relatively rapid procedure for the estimation of calcium in organometallic compounds is described. The oxygen filled flask for decomposition of the organic sample and AAS determination of the metal in aqueous medium without any effect of
Publikováno v:
Analytica Chimica Acta. 75:101-109
Complex species involved in the spectrophotometric determination of cobalt with 4-(2-pyridylazo)resorcinol (PAR = H 2 R) were studied in solution and in the solid state. An anionic [Co(III)R 2 ] - species was extracted from aqueous solution in chloro
Publikováno v:
Journal of Inorganic and Nuclear Chemistry. 43:3357-3361
The complex species of cobalt formed with 4-(2-thiazolylazo)resorcinol (TAR = H 2 Tar) in aqueous solution at pH 6–8 can be efficiently extracted by tetraphenylarsonium- and tetraphenylphosphonium chloride in chloroform and similar chlorinated solv
Publikováno v:
Microchemical Journal. 21:129-134
A rapid titrimetric method for the determination of phosphorus in organic compounds and their metal complexes is described. It is based on the precipitation of silver phosphate, after the decomposition of samples by the oxygen-flask combustion. The p
Publikováno v:
Microchemical Journal. 24:536-544
Extraction of vanadium-4-(2-thiazolylazo)resorcinol complexes by quaternary salts such as triphenylmethylarsonium iodide, tetraphenylarsonium chloride, and tetraphenylphosphonium chloride has been studied. Quantitative extraction is achieved with tet
Autor:
L. Kosta, Z. Štefanac
Publikováno v:
Fresenius' Zeitschrift für Analytische Chemie. 297:335-338
There are twenty chemistry departments at Yugoslavian universities and polytechnics with as many chairs of Analytical Chemistry. The individual courses show considerable differences with regard to their extent and content. The share of Analytical Che
Publikováno v:
Microchemical Journal. 18:596-604
A sensitive method for microdetermination of calcium in organic compounds is described. The combustion in an oxygen stream or oxygen flask with electrical ignition of the sample in porcelain crucible was found advisable. Carbon dioxide has to be expe
Publikováno v:
Microchemical Journal. 27:372-379
The study of D(−)-ribose complexing with calcium in aqueous solutions less than 1.64 × 10 −1 M by potentiometric measurements with a calcium selective electrode afforded the value of K 1 = 1.70 liters × mole −1 (SD = 1.05 × 10 −3 ). Numeri
Publikováno v:
Polyhedron. 2:447-453
The condensation of ethyl-2-hydroxy-4-oxo-4-(4-hydroxy-6-methyl-2-pyrone-3-yl)-2-butenoate with primary aliphatic monoamines occurs at 4-hydroxy group of the pyrone ring according to 1 HNMR and mass spectrometric data. The ketamine tautomeric form of
Publikováno v:
Microchemical Journal. 21:402-410
The fluorescence properties of the beryllium and aluminum complexes with 2, 4-dioxo-4-(4-hydroxy-6-methyl-2-pyrone-3-yl) butyric acid ethyl ester (Ligand) were studied and optimal conditions for their fluorometric determination were established. Bery