酸性腐植酸分子结构中有羧基和酚羟基等基团,使其具有弱酸性。所以腐植酸可以与碳酸盐、醋酸盐等进行定量反应。腐植酸与其盐类组成的缓冲溶液,可以调节土壤的酸碱度,使农作物在适宜的pH值条件下生长。离子交换性腐植酸分子上的一些官能团,如羧基-C O O H上的H+可以被Na+、K+、 Acid humic acid molecular structure of carboxyl and phenolic hydroxyl groups, so that it has weak acidity. So humic acid with carbonate, acetate and other quantitative reaction. Buffered humic acid and its salts solution, you can adjust the pH of the soil, so that crops grow at the appropriate pH conditions. Some functional groups on the ion-exchangeable humic acid molecule, such as H + on the carboxyl-C O O H, can be replaced by Na +, K +