Extraction of Humic Acids from the Gusinoye Ozero Oxidized Brown Coal (Buryatia) with the Help of the Solutions of Potassium, Sodium and Ammonium Hydroxides
A. D. BUDAEVA AND E. V. ZOLTOEV
Baikal Institute of Nature Management, Siberian Branch of the Russian Academy of Sciences,
Ul. Sakhyanovoy 6, Ulan Ude 670047 (Russia)
E-mail: ezol@binm.bscnet.ru
Pages: 419-423
Abstract
Results of the extraction of humic acids (HA) from the oxidized brown coal of the Gusinoye Ozero deposit with the help of the solutions of sodium, potassium and ammonium hydroxides are presented.
A comparison of the yields of HA for different ratios of an alkaline solution to coal and duration of ultrasonic treatment (sonication) of alkaline humate-containing extracts or without ultrasonic treatment (settling) is carried out. The amounts of acidic functional groups (phenol and carboxyl) in HA and in the initial oxidized coal are determined.
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