Method of using plasma transmission spectrograph to detect potassium oxide in compound fertilizer

Abstract

The invention discloses a method for measuring potassium oxide in a compound fertilizer by a plasma emission spectrometer. The content of potassium oxide in the compound fertilizer is detected by a plasma emission spectrometer, and the detection is carried out through a suitable standard liquid configuration, a suitable standard curve and instrument parameters. . When this method is used, there is no need to add masking agent and precipitant, which reduces the filtration, drying and weighing process of precipitation, and is not affected by sample composition. It can detect the content of potassium oxide in high concentration and various compound fertilizers, and the detection accuracy is high. , good stability and high sensitivity. The method has the characteristics of simple operation process and short time consumption, which can greatly alleviate the labor intensity of personnel, shorten the analysis time, and improve the analysis efficiency.

Description

Technical field [0001] The invention relates to a method for measuring potassium oxide in a compound fertilizer by a plasma emission spectrometer, and belongs to the technical field of instrument analysis. Background technique [0002] As one of the essential nutrient elements for plant growth, potassium is an important indicator in the production of compound fertilizer. Therefore, it is of great significance to determine its content. The current methods for determining potassium usually include volumetric method, gravimetric method, potentiometric titration, flame photometry, atomic absorption spectrometry, ion selective electrode method, emission spectrometry, chromatography, X-ray diffraction, and neutron activation analysis. Sub-determination and so on. In the prior art, the potassium tetraphenylborate method is usually used to determine potassium in compound fertilizers. The sodium tetraphenylborate solution in the weakly alkaline solution and the potassium in the sample pr...

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Problems solved by technology

[0004] However, the detection of this method will be affected by the interference factors such as the concentration of the sample and other chromogenic metals in the compound fertilizer. Usually, it can only measure the content of potassium oxide in compound fertilizers with low concentration and high purity, such as in potassium phosphate compound fertilizers. , phosphate root will interfere with the determination of potassium. In chlorine-based and sulfur-based compound fertilizers, pH and nitrate will interfere with the determination of potassium. Therefore, chemical methods are usually used to pre-treat samples, which will bring The influence of other ions on the detection

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