Zobrazeno 1 - 10
of 10
pro vyhledávání: '"Ülo Haldna"'
Publikováno v:
Journal of Chromatography A. 660:147-152
The performance of medium-quality ion chromatographic equipment was improved by using pseudo-random sample intoduction correlation chromatography (CC). The importance of the digital preprocessing of the detector signal prior to decorrelation was demo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b7f87188be11f9f22e7a477949df8118
https://doi.org/10.1016/0021-9673(94)85108-5
https://doi.org/10.1016/0021-9673(94)85108-5
Publikováno v:
Computers & Chemistry. 15:99-102
Using the measured UV absorption spectra of 2-pentanone and cyclopentanone (33,000–53,000 cm−1) in 0–99% H2SO4 (w/w) as an example, a new approach to the analysis of ketone UV absorption spectra in aqueous strong acid solutions has been suggest
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d06ea9a91dc4975ec5f3096a1121053a
https://doi.org/10.1016/0097-8485(91)80032-h
https://doi.org/10.1016/0097-8485(91)80032-h
Autor:
Marina Grebenkova, Ülo Haldna
Publikováno v:
Computers & Chemistry. 17:241-243
Target testing method (TT), and two versions of principal component analysis (PCA1 and PCA2) were compared in order to evaluate their usefulness in estimating pKBH+ and m* values of a weak base, 2-hydroxybenzoic acid. PCA1 uses measured molar extinct
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dd680b848d930270af367c7ecf34ba31
https://doi.org/10.1016/0097-8485(93)80002-u
https://doi.org/10.1016/0097-8485(93)80002-u
Autor:
Ülo Haldna
Publikováno v:
Journal of Chromatography A. 604:282-284
Ion chromatography was applied to calculate the selectivity coefficients between Cl − , NO − 3 , HPO 2 4 and SO 2− 4 ions on HIKS-1 resin containing −CH 2 N + (CH 3 ) 3 groups. For each combination of ions, 25 different eluents were applied.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7a08b6062a0853b4e902b725224e00e4
https://doi.org/10.1016/0021-9673(92)85139-k
https://doi.org/10.1016/0021-9673(92)85139-k
Autor:
Ülo Haldna
Publikováno v:
Journal of Chromatography A. 589:197-199
The eluting ions OH−, HCO3− and CO32− in carbonate eluents are absorbed on the resin in the separation column. In an equilibrium state, the concentrations of these ions on the resin depend on the composition of the carbonate eluent used. A meth
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9260fbbf344d3d697ebf4b0ff65cee47
https://doi.org/10.1016/0021-9673(92)80022-m
https://doi.org/10.1016/0021-9673(92)80022-m
Publikováno v:
Mendeleev Communications. 4:22-23
The protonation parameters in the Cox–Yates treatment p K BH = 3.45±0.28 and m*=0.34±0.06 have been determined by 13 C NMR spectroscopy for 3,5-dihydroxybenzoic acid in sulfuric acid–water mixtures.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c67a54916da870bb7f0012176400701f
https://doi.org/10.1070/mc1994v004n01abeh000333
https://doi.org/10.1070/mc1994v004n01abeh000333
Autor:
A. Murshak, Ülo Haldna
Publikováno v:
Computers & Chemistry. 8:39-42
Digital simulation models have been applied in order to check whether Simonds′ method in factor analysis enables us to recover the shapes of vectors and their coefficients used in generating synthetic data matrixes. It has been found that the resul
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bc748a5bc6b8c9330ef4ef024aacc610
https://doi.org/10.1016/0097-8485(83)80004-7
https://doi.org/10.1016/0097-8485(83)80004-7
Autor:
A. Murshak, Ülo Haldna
Publikováno v:
Progress in Physical Organic Chemistry, Volume 18
The basicity constants (KBH+) and corresponding solvation parameters (m*) of weak bases are extensively studied in aqueous solutions of strong acids applying the UV-VIS spectrophotometry. But difficulties in calculating the pKBH+ and m* values are of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9a6e7507b0f0770314617158872516c9
https://doi.org/10.1016/0097-8485(84)80006-6
https://doi.org/10.1016/0097-8485(84)80006-6
Publikováno v:
Journal of Chromatography A. 364:189-192
The use of an appropriate eluent for the simultaneous determination of chloride and nitrate ions in vegetables by single-column ion chromatography is described. Different eluents should be used for vegetables having a high nitrate content, e.g. , let
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9a0e348c1395f3c6a06cdb4e0649cad5
https://doi.org/10.1016/s0021-9673(00)96208-3
https://doi.org/10.1016/s0021-9673(00)96208-3
Publikováno v:
Journal of Chromatography A. 350:296-298
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::82388f78e9f929eabb52dc44d856ba56
https://doi.org/10.1016/s0021-9673(01)93530-7
https://doi.org/10.1016/s0021-9673(01)93530-7