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Behaviour in solution of humic acids from lignite in the presence of calcium ions

✍ Scribed by Teresa Martinez; C. Romero; JoséM. Gavilán

Publisher
Elsevier Science
Year
1983
Tongue
English
Weight
225 KB
Volume
62
Category
Article
ISSN
0016-2361

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✦ Synopsis

Humic acids (HA) extracted from Spanish lignite, were studied to discover their Ca-complexing capacity and their coagulation threshold. It wasfound that the concentration of Ca' + ions necessary for the complete flocculation increased with the increase of pH and ionic strength (P) and it was linearly dependent on the concentration of HA. The calcium-complexing capacity of HA increased with the increase of pH and registered lower values as p was increased. The i.r. spectra of the Ca-humic acid complexes show that the metal is complexed mainly by carboxylic groups from the HA.

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