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acid-base equilibrium research in solutions kompleksonov

For definition of constants of acid dissociation kompleksonov and stability of their complexes with some metals the method of rn-potentiometric titration [38-41] more often is used.

rN-potentsiometricheskie methods of research of an acid-base equilibrium in solutions have found wide application thanks to the simplicity, accuracy and availability.

These methods are based on registration rn, volume titranta and its concentration. The method possesses high accuracy, the error of definition of constants of stability can make from 0,02 to 0,03 ed rk [42].

Calculation of constants of stepwise dissociation is made on the following

To formulas (for kompleksona HnL):

Where Cl - the general concentration of a ligand in a solution;

And - quantity of gramme-equivalents titranta, falling to one mole of a ligand.

For calculation of constants of stability of formed complexes at processing of results of rn-potentiometric titration there is the classical method Berruma [43] based on use of function of formation n. Formation function represents the relation
Concentration of the ligand connected in a complex, to the general concentration of metal - kompleksobrazovatelja

Method Berruma allows to define constants of stability of complexes graphically also. In according to the calculated values [L] and nстроятся curve formations (zavisimostii, further

Constants of stability consistently formed mono-and biligandnyh complexes (lg Kmlи lg Km γ are graphically defined., accordingly)

At all advantages of method Berruma it is impossible to forget and about the lacks inherent in this method. First, the yielded method does not consider existence protonirovannyh complexes, and for kompleksonov in the field of low values rn formation of such complexes is rather characteristic process. Secondly, the method is not applicable for studying of highly enough steady complexes, i.e. the condition lg kml ≤ Pk4 [44] should be satisfied.

2.2.

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A source: Biberina Evgenie Sergeevna. COMPLEX FORMATION OF SOME ZE-METALS WITH L-, D-FORMES H- (CARBOXYMETHYL) ASPARAGINOUS AND L-N- (CARBOXYMETHYL) ACID GLUTAMINE. Thesis for the degree of candidate of chemical sciences. Tver - 2018. 2018

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