摘要:

Sulfur belongs to the main crosslinking components in rubber mixes and hence its great effect on the product properties obtained. It is therefore extremely important to recognize the movement and distribution of sulfur during the process as its static and dynamic properties depend on heterogeneity of space crosslinking of the vulcanizate. In the present paper the radioisotope method of investigation of sulfur distribution and dispersion in rubber mixes has been discussed and examples of interpretation of the results obtained in experiments have been given.

ISSN:0021-1915    

DOI:10.1080/10256019008624233

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

ISSN:0021-1915    

DOI:10.1080/10256019008624234

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

摘要:

After preseparation of the nitrogen compounds derived from microbial nitrification on a strong basic anion exchanger it is found hydroxylamine together with ammonium in one fraction. The nitrogen of this two compounds can be separated for the emission spectrometric15N analysis by the selective oxidation of the hydroxylamine to nitrite/nitrate using an iodine solution. Thus the hydroxylamine is protected against disproportionation during the following ammonium isolation by means of steam distillation in an alkaline medium. After that the nitrite/nitrate is reduced to ammonium using ferrous hydroxide and can than be librated by steam distillation. The performance of the method under discussion will be demonstrated by analysing solutions with known ammonium and hydroxylamine contents.

ISSN:0021-1915    

DOI:10.1080/10256019008624235

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

ISSN:0021-1915    

DOI:10.1080/10256019008624236

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor

ISSN:0021-1915    

DOI:10.1080/10256019008624237

出版商:Taylor & Francis Group    

年代:1990

数据来源: Taylor