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pro vyhledávání: '"Eugen Scholz"'
Autor:
Eugen Scholz
The Karl Fischer titration is used in many different ways following its publication in 1935 and further applications are continually being explored. At the present time we are experiencing another phase of expansion, as shown by the development of ne
Autor:
Eugen Scholz, Yasuhiro Nakagawa
Publikováno v:
Analytical Sciences. 10:433-437
An investigation concerning the role of carbon tetrachloride, which is usually contained in the catholic reagents used for Karl Fischer coulometric titration, is described. Carbon tetrachloride is reduced in the cathode to produce an electrolyte (chl
Autor:
Eugen Scholz
Publikováno v:
Fresenius' Journal of Analytical Chemistry. 348:269-271
Coulometric Karl Fischer reagents normally contain carbon terachloride in the catholyte and chloroform in the anolyte. Both compounds take part in the reaction. They are reduced at the cathode forming chloride ions which increase the water capacity o
Autor:
Eugen Scholz
Publikováno v:
Fresenius' Journal of Analytical Chemistry. 340:71-72
Peroxides are oxidizing agents. They can infere with the Karl Fischer titration because they can oxidize iodide to iodine in the KF medium (methanolic, weakly acidic). The liberated iodine then reacts with the water present in the sample and the wate
Autor:
Eugen Scholz
Publikováno v:
Fresenius' Zeitschrift f�r Analytische Chemie. 303:203-207
Autor:
Eugen Scholz
Publikováno v:
Fresenius' Zeitschrift für analytische Chemie. 310:423-426
Autor:
Eugen Scholz
Publikováno v:
Fresenius' Zeitschrift für analytische Chemie. 314:567-571
Pyridine-free KF reagents are also suitable for the coulometric determination of water. They accelerate the course of reaction and produce more accurate results. Their use has been tested with about 100 substances employing three different instrument
Autor:
Eugen. Scholz
Publikováno v:
Analytical Chemistry. 57:2965-2971
On reduit les interferences dues a la formation d'acetals, cetals et disulfites en choisissant les reactifs de KF a base d'imidazole et en prenant des alcools halogenes comme solvant
Autor:
Eugen Scholz
Publikováno v:
Fresenius' Zeitschrift für analytische Chemie. 330:694-697
Karl Fischer titration can be applied to many phenols without any interference, though some are oxidized during titration. One-component reagents are to be preferred because they are less sensitive to interferences. Only pyrogallol and aminophenols a