Soil rapidly-available phosphorus measuring method based on Olsen method

A determination method and technology of available phosphorus, which are applied in the preparation of test samples, measurement of color/spectral properties, etc., to achieve the effects of simple and fast reagent preparation, saving reagent consumption, and increasing reaction space

Pending Publication Date: 2019-07-16
HUBEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] Aiming at the problems existing in the determination of soil available phosphorus by the existing Olsen method, the invention provides a method for the determination of soil available phosphorus based on the Olsen method

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  • Soil rapidly-available phosphorus measuring method based on Olsen method
  • Soil rapidly-available phosphorus measuring method based on Olsen method
  • Soil rapidly-available phosphorus measuring method based on Olsen method

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Embodiment Construction

[0058] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0059] In the prior art, the reaction is carried out in a volumetric flask or a colorimetric tube, the reaction space is small, and the bubbles produced by the reaction of sulfuric acid and sodium bicarbonate are not easy to drive out. When the organic matter is high, the bubbles are very easy to overflow and cause a large error.

[0060] Constant volume is required, which prolongs the operation time, affects the reaction, and brings errors.

[0061] When the volume is shaken evenly, the air bubbles will easily rush out of the impulsive lid to cause the liquid to overflow, resulting in inaccurate volume stabilization and er...

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Abstract

The invention belongs to the field of technical operation of soil nutrient form analysis and measurement, and discloses a soil rapidly-available phosphorus measuring method based on the Olsen method.An extracting agent, a molybdenum-antimony stock solution, a comparison reagent, a phosphorus standard solution and a color developing agent are firstly prepared; a to-be-measured solution is preparedthrough sample weighing, reagent adding, oscillation, filtering and the like; a standard curve is drawn through the steps of standard-series suction, reagent adding, water adding, color developing agent adding, absorbance measurement and the like; phosphorus in the to-be-measured solution is measured through the steps of to-be-measured solution suction, water and color developing agent adding, absorbance measurement and the like; and a standard curve regression equation and the soil rapidly-available phosphorus content are calculated. By improving reagent preparation, a reaction system and comparison reaction, operation is simplified, error sources are reduced, operation time is shortened, the types and amount of reagents are reduced, operation is easy and rapid, and the cost is low and saved.

Description

technical field [0001] The invention belongs to the technical operation field of soil nutrient speciation analysis and determination, and in particular relates to a soil available phosphorus determination method based on the Olsen method Background technique [0002] At present, the existing technologies commonly used in the industry are as follows: [0003] Soil available phosphorus is an index that reflects soil phosphorus level, soil phosphorus availability and soil phosphorus supply capacity, and is an important basis for guiding crop planting and phosphorus fertilizer application. In most cases, the Olsen method is used to determine the soil available phosphorus content, which is to extract with 0.5M sodium bicarbonate and measure by molybdenum antimony anti-color spectrophotometry. However, there are many problems in the existing Olsen method for measuring soil available phosphorus: the reaction in a volumetric flask or colorimetric tube has a small reaction space, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/28G01N1/30
CPCG01N1/28G01N1/30G01N21/31
Inventor 杨兰芳李亚东张健琳
Owner HUBEI UNIV
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