A Sensitive Polarographic Test for the Absence of Rhenium in Manganous Salts

Details A Sensitive Polarographic Test for the Absence of Rhenium in Manganous Salts A Sensitive Polarographic Test for the Absence of Rhenium in Manganous Salts

May 1935

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1935natur.135..870h&link_type=abstract

Nature, Volume 135, Issue 3421, pp. 870-871 (1935).

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Scientific paper

IN 1925, the present author jointly with V. Dolejšek1 reported on the occurrence of element No. 75 (Mendělěěv's dwimanganese) in manganese salts. However, the discoverers of rhenium, I. and W. Noddack2, and others3 expressed doubts as to whether any measurable traces of this new element could occur in manganese specimens. I investigated the polarographic behaviour of potassium perrhenate and found that it is deposited at the dropping mercury cathode at the potential -1.2 v. from the normal calomel zero (Fig. 1. Curve 2). This method is sensitive enough to show the presence of perrhenate when its concentration is 10-5 m. in 1 m. MnCl24 or in alkaline solutions, even if they contain tungstates or molybdates in considerable amounts.

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