Total-dissociation DGT combined film for determination of soil available phosphorus and preparation method thereof

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

Active Publication Date: 2017-04-19
TIANJIN TIANRUN YIKANG ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conventional method for determining soil available phosphoru

Method used

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  • Total-dissociation DGT combined film for determination of soil available phosphorus and preparation method thereof
  • Total-dissociation DGT combined film for determination of soil available phosphorus and preparation method thereof
  • Total-dissociation DGT combined film for determination of soil available phosphorus and preparation method thereof

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

[0033] Among them, the preparation method of allyl-modified low-temperature activity agarose is (public document is 2014100085993CN103752285A): add 200-400 mg of sodium borohydride to 10-20 mL of allyl glycidyl ether to obtain solution A; 15g agarose was added to 300mL 0.3-0.5mol / L NaOH solution, and stirred continuously to form agarose suspension B; solution A was added to suspension B to form solution C, solution C was continuously stirred for 12h; the mixture was filtered, Wash with distilled water until neutral; dehydrated and dried in vacuum to obtain the...

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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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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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