Method for determining potassium content
At present, the methods for determining potassium content mainly include tetraphenylboron sodium or sodium nitrate sodium gravimetric method and atomic absorption method and instrument direct measurement. The determination of potassium has a high accuracy of gravimetric method, and the analysis error is about 2%. However, it takes time to determine the more expensive drying and weighing equipment; the use of atomic absorption spectrometry can quickly determine potassium, the analysis error is about 3%, but This method requires expensive equipment, is difficult to popularize, and is limited to the determination of trace potassium. Soil Fertilizer Detector can directly measure the content of potassium in chemical fertilizers. The instrument uses the photometric method. After a few minutes of operation, the instrument prints a test report on the spot and draws the result. Traditional laboratory methods require professionals to do manual calculations using the standard curve, and are only suitable for professionals with extensive experience. They require high-temperature heating or concentrated acid digestion. They are not suitable for non-professionals and are not suitable for testing vehicles. Traditional experiments The chamber method also requires the purchase of imported instruments, which has high cost, and even worse, a test report can take 7-15 days, and the measurement result takes a long time. The soil fertilizer tester avoids these problems. The method is simple and fast. It can also be used by non-professionals as well as for professional testing laboratories. Soil fertility detectors are not expensive imported equipment, the average body to the sample, the cost is less than 10 yuan, more suitable for laboratory testing. In addition, the tetraphenylborate potassium ratio method is a rapid method for determining potassium. The method adopts the principle that sodium tetraphenylboron reacts with potassium or gold to produce tetrabutylborate or tetraphenylboron. The high-efficiency flocculant is used under certain conditions to disperse potassium tetraphenylborate or tetraphenylboron in solution. The precipitates rapidly agglomerate and float to the upper part of the special reaction flask to form a fixed height. The height of this Figure 1 is proportional to the measured potassium or the content of the solution, and the ratio can be calculated by calculating the ratio. The potassium content of the compound. In this analytical method, since the precipitated potassium tetraphenylborate or tetraphenylborate precipitate is a floe and is dispersed in a solution, a fixed height cannot be formed, so finding a high-efficient flocculant causes the precipitate to rapidly agglomerate and float to The surface of the solution, then measured by the higher than the method is the key to the technology. The efficient flocculant may be organic or inorganic, and the method uses polypropylene amide. It should be pointed out that: 1. The height of the sediment changes with time, and when the time is long, the height decreases. Therefore, the reading time during the actual measurement should be the same as the reading time when the standard curve is used; otherwise, an error will occur; 2. Reaction bottle When the cross-sectional area changes, the height of the sediment will change accordingly. Therefore, the reaction flask of the same specification should be used for the actual measurement and the standard curve. 3. The standard curve for measuring potassium and the standard curve for measuring the money cannot be used interchangeably. The selected high-efficiency flocculant will also make the standard curve different; 4. The difference in solution temperature will cause the change of the height of the sediment, so the measured and the standard curve should be as consistent as possible. The reaction flask is preferably made of transparent glass to facilitate observation of the reaction conditions in the flask and to measure the height of the precipitate. Since sodium tetraphenylboron and high-efficiency flocculants do not react with each other, in order to speed up the analysis, the two solutions can be stored in a reagent bottle to form a reaction mixture. When used, adding the chemical fertilizer directly to the mixture can cause the potassium in the solution to precipitate as ions and quickly float to the liquid surface to form a fixed height. However, this reaction mixture should not be stored for a long period of time. In addition, only adding excess sodium tetraphenylborate solution during use can completely precipitate the potassium ions in the solution. This method can quickly and accurately determine the content of potassium or chloride in various fertilizers (or compounds, mixtures). It is suitable for rapid and accurate analysis of potassium or sodium in raw materials, intermediate products and final products in the process of potash fertilizer or nitrogen fertilizer production. The method is simple and rapid, the analysis error is about 4%, the required equipment is only about 20 yuan, and the consumption of materials is only 0.20 yuan each time, which has a good promotion and application value. Toilet Soap Packing Machine,Automatic Soap Packaging Machine,Laudry Soap Packing Machine Deke Plastics Machinery Co., Ltd. , http://www.china-plastic-granulator.com