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Determination of soil available phosphorus fully dissociated DGT binding membrane and its preparation method

A technology combining film and available phosphorus, applied in the direction of measuring devices, surface/boundary effects, instruments, etc., can solve the problems of complex soil available phosphorus process, time-consuming, unsuitable for on-site testing, etc., and achieve low preparation cost and simple production process , The effect of production process optimization

Active Publication Date: 2019-06-18
TIANJIN TIANRUN YIKANG ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Description
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  • Application Information

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Problems solved by technology

However, the conventional method for determining soil available phosphorus is complex and time-consuming, and is not suitable for on-site testing.

Method used

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  • Determination of soil available phosphorus fully dissociated DGT binding membrane and its preparation method
  • Determination of soil available phosphorus fully dissociated DGT binding membrane and its preparation method
  • Determination of soil available phosphorus fully dissociated DGT binding membrane and its preparation method

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preparation example Construction

[0032]Preparation method of gel: Prepare 100 mL of gel solution. Weigh 0.4g of cross-linking agent, dissolve it in 15mL of water, add 47.5mL of deionized water and mix in a clean plastic bottle (or beaker), shake the mixture and add 37.5mL of 40wt% acrylamide solution. Make sure the gel solution is well mixed by shaking or stirring. The gel solution can be stored in a 4°C refrigerator for at least 3 months.

[0033] Wherein, the preparation method of allyl-modified low-temperature active agarose is (published document is 2014100085993CN103752285A,): 200-400 mg sodium borohydride is added to 10-20 mL of allyl glycidyl ether to obtain solution A; 5- Add 15g of agarose to 300mL of 0.3-0.5mol / L NaOH solution, stir constantly to form agarose suspension B; add solution A to suspension B to form solution C, and stir solution C continuously for 12h; filter the mixture, Wash with distilled water until neutral; dehydrate and dry in vacuum to obtain the desired cross-linking agent. Th...

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Abstract

The invention relates to a total-dissociation DGT combined film for determination of soil available phosphorus and a preparation method thereof. The total-dissociation DGT combined film comprises the material composition: available phosphorus combined material nano Mg-Al-Fe-LDHs, a combined material dispersing agent, an acrylamide gel and the like. The above materials are uniformly mixed through ultrasonic treatment, and the mixture is pumped into a high-silica glass planar groove provided with a certain thickness of gaskets at periphery, after a mouth is sealed, a reaction is carried out for at least 1 h at the temperature of 42 to 46 DEG C, and the DGT combined film is prepared. The combined film material can highly efficiently and rapidly enrich available phosphorus, and can be completely dissociated within 30 min after 8 ml-10 ml of concentrated nitric acid is added; the combined film overcomes the disadvantages that a traditional DGT combined film is slow and incomplete to dissociate, difficult to prepare in laboratory, poor in generality, poor in phosphorus adsorption ability, high in price and the like.

Description

technical field [0001] The invention relates to a method for measuring available phosphorus in soil, in particular to a method for measuring available phosphorus in soil by film gradient diffusion technology of a solid bonded film made of nano Mg-Al-Fe-LDHs, an available phosphorus binding material. Background technique [0002] As one of the main sources of plant nutrition, soil phosphorus plays an important role in plant growth. The early formation and survival of plant roots require sufficient phosphorus from the soil. However, with the intensification of a series of global changes such as the excessive use of phosphorus fertilizers and eutrophication of water bodies, people are more aware of the importance of farmland resources and the environment. Therefore, inventing a new method for measuring soil phosphorus, fertilizing rationally, and increasing the utilization rate of phosphorus fertilizer have far-reaching significance for improving crop yield and agricultural pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00
CPCG01N13/00
Inventor 田娜娜赵玉杰宋志廷师荣光刘潇威周其文李玉浸
Owner TIANJIN TIANRUN YIKANG ENVIRONMENTAL PROTECTION TECH CO LTD
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