摘要:

Gibbs free energies,ΔG°, have been determined experimentally for processes of the typein a fused antimony trichloride solvent at 99°C. Concomitantly “theoretical free energy assignments”,ΔGthhave been computed for the corresponding reactions

ISSN:0003-2719    

DOI:10.1080/00032716908055291

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

A thin-layer electrochemical cell, which consists of a bed of graphite granules, is described and evaluated for chronopotentiometric experiments. The dependence of transition time on concentration is linear (within 3%) for a single component and the transition time of a component is independent of the concentrations of other electroactive materials in the solution.

ISSN:0003-2719    

DOI:10.1080/00032716908055292

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

Bis-substituted thiocarbamoyl disulfides (thiuram disulfides) were investigated as chromogenic reagents for the analysis of copper in trichloroacetic acid solutions. It was found that hydrogen peroxide speeded color development, increased color stability and enhanced color intensity in a trichloroacetic acid-alcohol matrix. In the presence of hydrogen peroxide, all copper complexes had molar absorptivities exceeding 30,000. Bis-pentamethylene thiocarbamoyl disulfide was selected as the best commerically available reagent of those investigated. The procedure is almost interference free, silver and mercury being the most serious interference. The sensitivity is 6 × 10−3micrograms/cm2.

ISSN:0003-2719    

DOI:10.1080/00032716908055293

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

A rapid method for the gas chromatographic determination of barbiturates in biological samples has been developed. It consists of methylating the barbiturates with dimethyl sulfate, extracting the sample withn-heptane, and gas chromatographic analysis of the heptane extract on a SE-52 column. A preliminary study revealed that the method could be used forin vivoand/orin vitrodeterminations. Minimum detectable amounts of barbiturates were shown to be between 0.01 and 0.05 μg. An added advantage of the procedure is the lack of interference from other constituents which might be present in the analytical sample.

ISSN:0003-2719    

DOI:10.1080/00032716908055294

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

A rapid esr titration method is described and demonstrated with the As2O3/KMnO4system. The results indicate that end points can be established with a precision of better than 1% and an accuracy of 0.4%.

ISSN:0003-2719    

DOI:10.1080/00032716908055295

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0003-2719    

DOI:10.1080/00032716908055290

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor