CHEMICAL CONSTITUTION OF COAL .12. OPTIMUM CONDITIONS FOR PREPARATION OF SUB-HUMIC ACIDS FROM HUMIC ACID BY OXIDATION WITH ALKALINE POTASSIUM PERMANGANATE

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DAVIES, C
LAWSON, GJ
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TE [石油、天然气工业]; TK [能源与动力工程];
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0807 ; 0820 ;
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