Quick analysis method of potassium content in compound fertilizer product and application thereof

The invention relates to the technical field of potassium content detection in potassium fertilizers, in particular to a quick analysis method of potassium content in a compound fertilizer product andan application thereof. The quick analysis method of potassium content in the compound fertilizer product is optimized and adjusted based on the determination of potassium content in compound fertilizers, that is, the potassium tetraphenylborate gravimetric method in the national standard GBT-8574-2010. The quick analysis method of potassium content in the compound fertilizer product is characterized in that: firstly, the test solution treatment process is optimized from the process of slowly heating and boiling in a good fume hood for 15 minutes to the process of heating and boiling at a higher temperature in a good fume hood and shortening the boiling time; and secondly, the drying process of placing a crucible stored with precipitation in a drying box at 120 degrees centigrade +/- 5 degrees centigrade and dryi