Method test K2O content in potassium humate
A comparison was made between the extraction method of hydrochloric acid solution and GB / T17767.3-2010 “Determination methods of organic-inorganic compound fertilizers. Part 3: Total potassium content” standard Differences in the determination method of potassium oxide.
The results show that the determination principle of the hydrochloric acid solution extraction method is the same as GB / T 17767.3-2010, except that the nitric acid-perchloric acid digestion method and sulfuric acid-hydrogen peroxide digestion method are not used in the preparation of the sample solution.
Instead, using the characteristics of humic acid precipitation, the sample was processed by extraction with hydrochloric acid solution; and the accuracy, safety and speed of this method were verified, and this was used to determine the potassium oxide content in potassium humate fertilizer products .
The development of standards provides a reference.