摘要:

A detailed study on the fluorescence properties of kinetin, following reaction with NaHSO3at pH 1.0 - 2.0 with heating on a boiling water bath (λex/ λem= 325 nm / 500 nm), has been undertaken. The detection limit is 0.003 μg/ml of kinetin and the calibration graph is linear over the range of 0.003 - 3.85 mUg/ml.

ISSN:0003-2719    

DOI:10.1080/00032719608000427

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

A new concentration and determination method for ppb-levels of hexavalent chromium ion in water, based on the reaction between chromium (VI) and iodide ion to form triiodide ion and the collection of the ion-associate of the triiodide ion with a cation surfactant on an organic solvent-soluble membrane filter, has been described. The color intensity due to the ion-associate in the resulting solution, obtained by dissolving the filter and solute, is directly proportional to the amount of chromium (VI) in the range 0.2 - 1.2 mUg. Detection limits better than 0.2 mUg dm−3as Cr (VI) can been achieved with a 100-fold enrichment factor. The diverse components normally present in water do not interfere. The proposed method has been applied to the analysis of several water samples, such as ground water and waste waters. The recoveries of the chromium (VI) added to the samples are quantitative, and results found are satisfactory.

ISSN:0003-2719    

DOI:10.1080/00032719608000428

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

ISSN:0003-2719    

DOI:10.1080/00032719608000431

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor