In-situ sampling method of phosphorus in soil

An in-situ, soil-based technology, applied in the direction of sampling devices, can solve problems such as difficulties, and achieve the effect of low production cost, simple structure of the device, and low interference

Inactive Publication Date: 2011-07-20
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are still great difficulties in th

Method used

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  • In-situ sampling method of phosphorus in soil
  • In-situ sampling method of phosphorus in soil

Examples

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Embodiment 1

[0027] A kind of in-situ sampling method of phosphorus in soil, its step is:

[0028] Step 1. Preparation of Precipitated Phase

[0029] 1) Take the fly ash, filter the impurities, and set aside;

[0030] 2) Extract fly ash with 10 mol / L concentrated hydrochloric acid to obtain an extract, add 1 mol / L NaOH solution to the extract while stirring to obtain a suspension, and set aside;

[0031] 3) Add 8% agarose and 11% polyacrylamide to the suspension in step 2 according to the mass ratio of the suspension, heat and mix evenly to obtain a mixed solution, which is introduced into a glass tank to obtain a precipitated phase ;

[0032] Step 2. Fabrication of the sampling device

[0033] Spread the prepared precipitated phase on a polyvinyl chloride sheet, and then cover a layer of dialysis membrane on the precipitated phase, discharge the air between the upper and lower layers of materials and the layer of the precipitated phase, and finally spread a layer on the dialysis membra...

Embodiment 2

[0040] A kind of in-situ sampling method of phosphorus in soil, its step is:

[0041] Step 1. Preparation of Precipitated Phase

[0042] 1) Take the fly ash, filter the impurities, and set aside;

[0043] 2) Extract fly ash with 10 mol / L concentrated hydrochloric acid to obtain an extract, add 1 mol / L NaOH solution to the extract while stirring to obtain a suspension, and set aside;

[0044] 3) Add 10% agarose and 13% polyacrylamide to the suspension in step 2 according to the mass ratio of the suspension, heat and mix evenly to obtain a mixed solution, which is introduced into a glass tank to obtain a precipitated phase ;

[0045] Step 2. Fabrication of the sampling device

[0046] Spread the prepared precipitated phase on a polyvinyl chloride sheet, and then cover a layer of dialysis membrane on the precipitated phase, discharge the air between the upper and lower layers of materials and the layer of the precipitated phase, and finally spread a layer on the dialysis membr...

Embodiment 3

[0053] Step 1. Preparation of Precipitated Phase

[0054] 1) Take the fly ash, filter the impurities, and set aside;

[0055] 2) Extract fly ash with 10 mol / L concentrated hydrochloric acid to obtain an extract, add 1 mol / L NaOH solution to the extract while stirring to obtain a suspension, and set aside;

[0056] 3) Add 12% agarose and 15% polyacrylamide to the suspension in step 2 according to the mass ratio of the suspension, heat and mix evenly to obtain a mixed solution, which is introduced into a glass tank to obtain a precipitated phase ;

[0057] Step 2. Fabrication of the sampling device

[0058] Spread the prepared precipitated phase on a polyvinyl chloride sheet, and then cover a layer of dialysis membrane on the precipitated phase, discharge the air between the upper and lower layers of materials and the layer of the precipitated phase, and finally spread a layer on the dialysis membrane A cellulose acetate filter membrane with an area greater than three layers ...

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Abstract

The invention discloses an in-situ sampling method of phosphorus in soil. The method comprises the following steps of: drilling a sampling hole in a land parcel by using a sampling device; inserting a casing pipe; pulling the casing pipe out during sampling; inserting a dialysis bag into the sampling hole; adding deionized water; extracting remaining water from the dialysis bag 24-36 hours later;taking the dialysis bag out; putting the sampling device into the sampling hole; putting a sampling assisting device into the sampling device; injecting water into the sampling assisting device; making the sampling device contact with a soil section; taking the sampling device out 36-48 hours later; and detecting to make sure that the content of phosphorus in soil is between 0.001 mg/L and 1 mg/L. In the process of the method, a flexible support is formed by using a membrane diffusion gradient technical device and a water sac, so that the method is suitable for field sampling and device adaptability is wider; a pretreating device is adopted, so that the method is suitable for droughty soil environment and sampling is simplified; meanwhile, the influence of a large amount of irrigation on leaching can be avoided; and iron and aluminum oxides are taken as a precipitated phase, so that higher adaptability is achieved compared with a single iron oxide and the production cost is lowered.

Description

technical field [0001] The invention relates to a method for sampling phosphorus, in particular to an in-situ sampling method for soil phosphorus. Background technique [0002] Due to the complex and diverse forms of phosphorus in the soil, in the traditional research method, the general sampling method often destroys the phosphorus content in the soil; now an anion exchange resin membrane is often used as the precipitation phase, which can partially simulate the effect of crop roots on the soil. However, due to the great difference between the kinetic adsorption characteristics of anion exchange resin membranes and plant roots, the obtained data can only reflect the situation of available phosphorus in the soil, and cannot provide information on the concentration of phosphorus in the soil aqueous solution, soil solid phase, etc. Key data related to plant phosphorus uptake, such as the ability to supplement and renew phosphate roots in soil water solution. In recent years, ...

Claims

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Application Information

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IPC IPC(8): G01N1/02
Inventor 徐晓峰寇太记焦念元
Owner HENAN UNIV OF SCI & TECH
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