✍ Scribed by M.V. Šušić; D.A. Marković; N.N. Hercigonja
No coin nor oath required. For personal study only.
The polarographic investigation of molten salts by means of the dropping mercury electrode (DME) was described by Steinberg and Nachtrieb 1. They found that characteristic polarographic waves can be obtained for a series of cations dissolved in molten salts, and proved the applicability of the Heyrovsk~,-Ilkovi6 equation to the reduction of these cations.
One of possible applications of the polarographic technique with DME to the investigation of complexes in molten salts has been demonstrated by Christie and Osteryoung 2. They determined stability constants of some di-valent metal chlorocomplexes in molten LiNO3-KNO3 eutectic using methods valid for aqueous solutions.
To our knowledge, there are no data in the literature concerning the polarographic behaviour of molten salts in the presence of complexing organic agents.
The use of DME in melts is limited and has some disadvantages 3'4. Because the work was with organic complexing compounds, we had to use low-melting salts, so that the experimental temperature never greatly exceeded 200°C. The DME is still applicable under these conditions.
Using complexon III (disodium salt of ethylenediaminetetraacetic acid) we investigated the behaviour of some di-valent metals and their organic complexes in the molten LiNO3-KNO3 eutectic.
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