摘要:

Selenium (IV) can be quantitatively extracted at trace concentrations with 2-thenoyltrifluoroacetone-xylene (0.03 M) at pH 1.0–4.5. It is determined in the organic phase photometrically by complexation with 3,3′-diaminobenzidine. The system conforms to Beer's law in the concentration range of 22–132 μg/ml of selenium. The complex is stable. Salting-out agents have no effect on extraction. Selenium can be extracted and determined in one operation in the presence of several elements.

ISSN:0037-2366    

DOI:10.1080/00372367108055569

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

A method is presented to obtain a true band width in zonal centrifuga-tion runs from an experimental measurement either by a photographic method or by a light-scanning method.

ISSN:0037-2366    

DOI:10.1080/00372367108055570

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Experiments were conducted in which the continuous particle electro-phoresis apparatus was utilized for the separation of five bacterial species and an ascosporogenous yeast. The separated bands observed when bacteria or bacteria-yeast binary mixtures were electrophoresed were not composed of pure cultures. This was confirmed by classical cultural techniques. The reasons for the poor resolution of microorganisms into pure cultures using this instrument are discussed.

ISSN:0037-2366    

DOI:10.1080/00372367108055571

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Extremely high resolution can be attained with correspondingly long columns made practicable by propelling the carrier gas with a driving force other than inlet pressure.

ISSN:0037-2366    

DOI:10.1080/00372367108055572

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor

摘要:

Various types of optical spectra could be obtained with the sensitivity of mass spectrometry by combining components from the latter and from molecular-beam technology as proposed.

ISSN:0037-2366    

DOI:10.1080/00372367108055573

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:0037-2366    

DOI:10.1080/00372367108055558

出版商:Taylor & Francis Group    

年代:1971

数据来源: Taylor