摘要:

The general utilization of fluorescence for pharmaceutical analysis is discussed and the native fluorescence of several barbiturates and the characteristics of each are reported. Concentration ranges applicable for linear response with the instrumentation used are also discussed. Utilization of direct measurement of the fluorescence of barbiturates for quantitative analysis provides simple, and thus faster, analysis with relatively the same accuracy and precision as conventional spectrophoto-metric methods. The wavelengths observed for emission and excitation make most analyses applicable to filter instrumentation. The simplicity of the analysis makes it generally applicable for automation.

ISSN:0003-2719    

DOI:10.1080/00032717108058592

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Conditions for the simultaneous separation and identification of as many as ten different metal ions have been established using the technique of reversed-phasethin-layer chromatography. Complete resolution of the ten ions in sub-microgram amounts was achieved using a liquid ion exchanger supported on cellulose. The total time for the analysis was 3–4 hours.

ISSN:0003-2719    

DOI:10.1080/00032717108058593

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

A gas chromatographic method is described for aminothiols and disulfides. This method is based upon the formation of the trimethysilyl derivatives and their separation by gas chromatography. The kinetics of the derivative formation were investigated. A synthetic method for C4 to C6 aminothiols is given.

ISSN:0003-2719    

DOI:10.1080/00032717108058594

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

The extraction of Eu(III) has been carried out from a 1 M (H,Na)Clo4solution into different organic solvents at constant total concentration (6.67 × 10−3M) of the extractant, di-n-butyl-ethane-(l,2)-diphosphonic acid (H2B2-EDP). The distribution coefficient of Eu(III) is influenced quite appreciably by the nature of the organic solvent. We observe that the distribution coefficient can vary by a factor of 106for two solvents such as chloroform and ieo-octane. The experimental results are compared with those of Dréze1, who used di-n-butyl-phosphoric acid (HDBP) for the extraction of Eu(lII) into different organic solvents. If we assume that H2-B2-EDP remains monomer for a total concentration of 6.67 × 10−3M in the solvents used2, then we may conclude that the extraction of Eu(III) by the associated HDBP or the monomer H2B2EDP is influenced in the same manner in the solvents used.

ISSN:0003-2719    

DOI:10.1080/00032717108058595

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Uronic acids in polysaccharides may be reduced by reaction of the propionated methyl ester with lithium borohydride in tetrahydrofuran. After hydrolysis and reduction of the monosaccharides the acetylated alditols may be separated by gas-liquid chromatography on a column of butanediol succinate. The method permits the simultaneous estimation of 4-O-methyl-D-glucuronic acid, glucuronic and galacturonic acids.

ISSN:0003-2719    

DOI:10.1080/00032717108058596

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Oxygen formed electrolytically from hydrogen peroxide at the surface of the dropping mercury electrode was determined and the charge needed for its electrolysis measured. The yield is about 50% of the theory, which indicates oxide formation. This is supported by formation of black precipitate on dropped off mercury. Reduction of oxygen in alkaline media is thus not a simple reversible process, but complicated by mercury oxide formation, similarly as on solid electrodes.

ISSN:0003-2719    

DOI:10.1080/00032717108058597

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

A thin-layer electrochemical cell has been developed as a detector for air pollutants, and tested with S02-air and Cl2-air mixtures. The cell gives well-defined, reproducible signals proportional to pollutant concentrations down to 20 ppb. Two electroanalytical procedures are described for monitoring or sampling polluted air with the cell: (1) a controlled-potential experiment in which the current-time response of the cell is related to pollutant concentration, and (2) an experiment similar to stripping analysis in which pollutants are first accumulated at an electrode surface under controlled potential conditions, and then analyzed voltammetrically.

ISSN:0003-2719    

DOI:10.1080/00032717108058598

出版商:Taylor & Francis Group    

年代:1971

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:10.1080/00032717108058591

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor