Humic substances do not have some kind of a complete structural and chemical configuration, it is found in nature in a class structure of complex macromolecular organic weak acid mixture , which contains a variety of reactive functional groups such as phenolic hydroxyl , carboxyl, hydroxyl , hydroxyl quinone , enol groups , sulfonic acid groups , amine groups , quinone groups , semiquinone groups , quinone hydrogen group , a methoxy group , a carbonyl group, and a carboxyl group and a phenolic hydroxyl group wherein the weak acid , can be combined with potassium, sodium , and ammonium ions generates the corresponding humic acid salt .
KHm as an efficient liquid fertilizer raw materials have been widely used in the production, but the vast majority KHm an encounter on hard water flocculation immediately solve their performance against hard water is the subject of many academic studies. Most scholars take nitric oxide , such as its sulfomethylation modified to reduce its molecular weight , to improve resistance to hard water .
Lignite and 40% higher concentration of nitric acid in a ratio of 10:3 , the oxidation 75 ℃ 40 min, can improve the cohesion limit of 4.9% , but the resulting increase in the cost of production , so when industrial production is not recommended KHm oxidative degradation of humic acid molecular weight materials ; weathered coal oxidation by nitric acid condensation limit raise obvious ; factory production KHm better anti- hard water should be used as raw lignite good activity to gather relatively large value limits and E4/E6 the raw material is preferred.