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Autor:
Marek Trojanowicz, Ryszard Lewandowski
Publikováno v:
Fresenius' Zeitschrift für analytische Chemie. 308:7-10
A flow-through system for the simultaneous determination of chloride (30–150 ppm), fluoride (0.08-0.4 ppm), nitrate (5–20 ppm) and ammonia (0.05-0.5 ppm) in water was developed. Solid-state chloride and fluoride electrodes, a nitrate PVC membrane
Publikováno v:
Fresenius' Zeitschrift für analytische Chemie. 311:7-10
A method for the determination of quantities of 0.5–500 μg of Cr(III) in the presence of chromates and dichromates is described. The samples are dissolved in an aqueous solution buffered at pH 7.0; the Cr(III) is selectively chelated with 2-thenoy
Autor:
Iain A. Donaldson
Publikováno v:
Fresenius' Zeitschrift für analytische Chemie. 321:559-562
A micro-assay for glucosamine, galactosamine, and mannosamine in mixtures containing amino acids is described. The procedure involves the reduction of these hexosamines in the presence of 14C-labelled standards, followed by their reaction with 3H-dan
Autor:
H. Hellmann
Publikováno v:
Fresenius' Zeitschrift für analytische Chemie. 310:224-229
Cation-active tensides of the dialkyldimethylammonium chloride type may be separated from a-tensides and n-tensides and determined photometrically after their reaction with bromophenol blue or disulphine blue. In the presence of clay minerals or of m
Autor:
Kiyohisa Ohta, Masami Suzuki
Publikováno v:
Fresenius' Zeitschrift für analytische Chemie. 298:140-143
The electrothermal atomization of lead has been investigated for accurate determination of lead in water samples. Thiourea served to lower the atomization temperature of lead and to eliminate the interferences from chloride matrix. The addition of th
Autor:
R. Kunze, M. Geißler
Publikováno v:
Fresenius' Zeitschrift für analytische Chemie. 318:15-18
In technical zinc electrolyte of high ionic strength (10.4 M) a copper-sensitrode (type Cu2Se/Ag2Se) is able to measure direct-potentiometrically the copper content within a working range from 200 to 0.5 mg/l. The reproducibility of the potential rea
Autor:
Jan Halkiewicz
Publikováno v:
Fresenius' Zeitschrift für analytische Chemie. 335:998-1001
A method is described for the determination of phthalate esters (PEs) in parenteral solutions and commercial salts utilized for the preparation of such solutions. It can also be applied in environmental analysis of contaminants. The method comprises
Autor:
G. Vos
Publikováno v:
Fresenius' Zeitschrift für analytische Chemie. 320:556-561
A simple and reliable method for the determination of dissolved hexavalent chromium in aquatic systems is described. Chromium(VI) is quantitatively coprecipitated with lead sulfate from weakly acidic (pH 3.5) sample solutions. It is determined by gra
Publikováno v:
Fresenius' Zeitschrift für Analytische Chemie. 286:222-225
Amperometric and potentiometric methods at a small constant current were developed to follow the course of catalytic titrations. In ammoniacal medium EDTA was determined by titration with 0.1 M copper(II) chloride in the presence of hydrogen peroxide
Autor:
Takahiro Kumamaru, Yuroku Yamamoto
Publikováno v:
Fresenius' Zeitschrift für analytische Chemie. 281:353-359
An atomic-absorption spectrophotometric method for the rapid and sensitive determination of arsenic, antimony, and selenium with the hydride-argon/hydrogen flame system has been studied. The comparison of the zinc tablet combined with stannous chlori