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前言腐植酸是一类大分子有机弱酸,天然的腐植酸是植物残体腐解后形成的;它广泛存在于土壤、泥炭、风化煤和褐煤中;可以从煤炭中抽提出来,也可以人工合成。腐植酸经提取后进行分离可制成棕、黑腐植酸钠和黄腐植酸钠。
Introduction Humic acid is a kind of macromolecule organic weak acid. Natural humic acid is formed after decomposition of plant residues; it is widely found in soil, peat, weathered coal and lignite; it can be extracted from coal or artificial synthesis. The humic acid can be separated into brown, black humic acid sodium and yellow humic acid sodium after being extracted.