Separation studies of molybdenum(VI) and rhenium(VII) using TPPO as an extractant

A simple, rapid and reproducible method for the extractive separation of molybdenum(VI) and rhenium(VII) is proposed using triphenylphosphine oxide (TPPO) dissolved in toluene as an extractant. The extractions are carried out from the hydrochloric and hydrobromic acid medium. The extraction of molyb...

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Bibliographic Details
Published in:Talanta (Oxford) 1996-09, Vol.43 (9), p.1465-1470
Main Authors: Vartak, Santosh V., Shinde, Vijay M.
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Exact sciences and technology
Extractant
Molybdenum(VI)
Rhenium(VII)
Separation
Spectrometric and optical methods
TPPO
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Summary:A simple, rapid and reproducible method for the extractive separation of molybdenum(VI) and rhenium(VII) is proposed using triphenylphosphine oxide (TPPO) dissolved in toluene as an extractant. The extractions are carried out from the hydrochloric and hydrobromic acid medium. The extraction of molybdenum is quantitative from 2.54–3.10 M hydrochloric acid and from 3.76–3.98 M hydrobromic acid, and that of rhenium is from 6.78–7.91 M hydrochloric acid. The probable nature of the extractable species is established using log distribution ratio-log concentration plots. The method permits mutual separation of molybdenum(VI) and rhenium(VII) and is applicable for the analysis of alloys and pharmaceutical sample. The detection limits for molybdenum(VI) and rhenium(VII) are 0.8 ppm and 4 ppm respectively.
ISSN:0039-9140
1873-3573
DOI:10.1016/0039-9140(96)01918-2