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Method for measuring potassium oxide in compound fertilizer

A technology of compound fertilizer and measurement method, which is applied in the field of instrument analysis, can solve the problems of measurement interference, influence, and potassium measurement interference, etc., and achieve the effects of short time consumption, improved analysis efficiency, and increased surface area

Inactive Publication Date: 2016-11-09
贵州开磷质量检测中心有限责任公司
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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 will interfere with the determination of potassium. Therefore, chemical methods are usually used to pre-treat the sample, but at the same time it will bring The influence of other ions on the detection

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  • Method for measuring potassium oxide in compound fertilizer

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Embodiment Construction

[0025] In order to make those skilled in the art understand the method of the present invention more clearly, the applicant further described in the form of experiments in specific examples.

[0026] A kind of assay method of potassium oxide in compound fertilizer, comprises the following steps:

[0027] 1) Sample treatment: Divide the sample to 40g-60g with a splitter or quartering method, crush it with a universal pulverizer, pass through a 0.4mm test sieve, mix well, and set aside; the sample is prepared with phosphoric acid mono Ammonium (diammonium phosphate), ammonium nitrate, potassium chloride is the analytical sample prepared by the chlorine-based compound fertilizer produced by raw materials, named as sample A; The analysis sample prepared by the sulfur-based compound fertilizer produced by raw materials is named as sample B; the compound fertilizer produced by using monoammonium phosphate (diammonium phosphate), potassium chloride, ammonium nitrate, urea, and potass...

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Abstract

The invention discloses a method for measuring potassium oxide in compound fertilizer. A flamephotometer is adopted for detecting the content of potassium oxide in compound fertilizer, and detection is carried out through suitable standard liquid preparation and suitable standard curve and instrument parameters. When the method is used, no masking agent or precipitator needs to be added, the filtering, drying and weighing processes of precipitate are omitted, interference of sample composition is avoided, the content of potassium oxide in various kinds of high-concentration compound fertilizer can be detected, the testing accuracy is high, and good stability and high sensitivity are achieved. The method has the advantages of being simple in operation process and short in consumed time, the labor intensity of personnel can be greatly reduced, the analysis time can be greatly shortened, and analysis efficiency can be improved.

Description

technical field [0001] The invention relates to a method for determining potassium oxide in compound fertilizers, belonging to the technical field of instrumental analysis. Background technique [0002] Potassium, as one of the nutrient elements necessary for plant growth, is an important indicator in the production of compound fertilizers. Therefore, it is of great significance to measure its content. At present, the determination methods of potassium usually include volumetric method, gravimetric method, potentiometric titration method, flame photometry, atomic absorption spectrometry, ion selection method electrode method, emission spectrometry, chromatography, X-ray diffraction method, neutron activation analysis, etc. Determination etc. In the prior art, the potassium tetraphenylborate method is usually used to measure potassium in the compound fertilizer. In the weakly alkaline solution, the sodium tetraphenylborate solution and the potassium in the sample generate a ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/71G01N1/28
CPCG01N21/71G01N1/286
Inventor 穆菊英李前陈修琼陈剑杨兴荣林莉
Owner 贵州开磷质量检测中心有限责任公司
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