The Calculation of the Stability Constant of Nickel Fulvate, using an Average Molecular Weight of Active Associate of Fulvic Acids at pH = 8 | Chapter 4 | Challenges and Advances in Chemical Science Vol. 4

Fulvic acids play a key part in complex formation processes and the migration of heavy metals in natural rivers. Despite extensive research, experimental data on the stability constants of complex fulvic acid-heavy metal complexes (including nickel) is heterogeneous and inconsistent. The failure to account the average molecular weight of fulvic acid partners is one of the causes of this problem, which leads to inaccurate conclusions. At pH=8.0, the complex formation process between Ni (II) and fulvic acids was investigated using the solubility method. As a solid phase, Ni(OH)2 suspension was utilised. To separate fulvic acids from Paravani Lake, researchers employed an adsorption–chromatographic method. As a sorbent, active charcoal was utilised. It is demonstrated in this chapter that every 0.29 part of an associate of fulvic acids (Mw=6260) inculcates into nickel's inner coordination sphere as an integral ligand during the complex formation process, implying that the average molecular weight of the associate of fulvic acids involved in the complex formation process is 1815. Previously, this component of the fulvic acid relationship was known as a "active associate." The composition of nickel dyhydroxo fulvate complex (1:1), the concentration of free ligand, and the average stability constant, which equals (beta) = 7,95x105; lg (beta)=5,90, were determined using the average molecular weight of the "active associate."

Author (S) Details

T. Makharadze
Department of Chemistry, Ivane Javakhishvili Tbilisi State University, 3 Chavchavadze Avenue, 0128, Tbilisi, Georgia.

G. Makharadze
Department of Chemistry, Ivane Javakhishvili Tbilisi State University, 3 Chavchavadze Avenue, 0128, Tbilisi, Georgia.

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