Abstract:
Except the alkaline metals and alkaline-earth metals and some heavy
metals such as Pb, Fe, etc the majority of elements within this class emerge
in small amounts, dispersed in natural backgrounds, in raw materials,
deposits, industrial waters, dead catalysts and not ultimately in rivers basin,
lakes and oceans. Presently, trials are being more and more intensively
undergone for their isolation and concentration as well as for rare metals
recovery, which are expensive. In order to solve these issues researchers
shall widely resort to the use of different types compounds, among which the
oximic derivatives are to be found. The intended outcome for the
accomplished theoretical and experimental researches is to provide the
possibilities for the use of oximes as precipitating reagents and the
determination of some metals within the analytical practice.
In the present work there are shown physico-chemical
characterization with middle transformation IR spectra, TG, DTA, and DTG
measurements studies the thermal behavior of the nickel (II) chelates with
asymmetric -dioximes. These complexes have a great importance from the
analytical methods for determining the metal mentioned under this form.The
work presents also the spectrometric methods for determining the nickel with
aliphatic asymmetric dioximes, namely the methyl-ethyl-dioxime, respectively
methyl-isopropyl-dioxime.
The statistical interpretation of the experimental data, in comparison
with other methods which are known in the literature and we specially refer
to the determinations based upon the reaction of nickel with dimethylgioxime
certify that the worked out methods of the present work are enough accurate
and reproducible for the purpose we have in view. The asymmetric dioximes
may set up potential organic reagents in the analytic determinations of nickel
and palladium, as they are extremely sensitive and selective for this metal.
