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Method for measuring soil available phosphorus using abandon ion exchange resin ball

A technology of ion exchange resin and effective phosphorus, which is applied in the direction of color/spectral characteristic measurement, sampling device, etc., can solve the problems of high analysis cost and expensive resin ball, and achieve the effect of accurate test result, simple method and low cost

Inactive Publication Date: 2008-07-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the resin balls are expensive (“Gong Tong Jia” resin balls are priced at US$4 each), and after being used once, they are discarded, resulting in high analysis costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1, a kind of method utilizing waste ion-exchange resin ball to measure soil available phosphorus, carries out following steps successively:

[0016] 1), regenerate the discarded ion exchange resin balls:

[0017] Soak 100 discarded "general-purpose good" ion exchange resin balls in 1 L of NaHCO with a concentration of 1.0 mol / L while stirring 3 In the solution for 2 hours; after taking it out, soak it in 2.5L NaHCO with a concentration of 0.1mol / L 3 solution for 2 hours; then rinse with deionized water 1 to 2 times to wash away excess NaHCO 3 ; Finally soak in deionized water to obtain regenerated resin balls for later use;

[0018] 2), using laboratory assays:

[0019] Select representative paddy fields in Wucheng District, Jinhua City to arrange 18 NK treatment areas, with an area of ​​100m2 2 . Use urea for nitrogen fertilizer, apply pure N 150kg / ha for early rice and 180kg / ha for late rice; apply potassium chloride for potassium fertilizer, apply pur...

Embodiment 2

[0024] Embodiment 2, a kind of method utilizing waste ion-exchange resin ball to measure soil available phosphorus, carries out following steps successively:

[0025] 1), regenerate the discarded ion exchange resin balls:

[0026] With embodiment 1.

[0027] 2), using laboratory assays:

[0028] In Wucheng District, Jinhua City, select representative paddy fields and arrange 24 NPK treatment areas, with an area of ​​45m2 2 . Urea is used for nitrogen fertilizer, 150kg / ha of pure N for early rice and 180kg / ha of pure N for late rice; superphosphate is used for phosphorus fertilizer, K 25kg / ha is used for early and late rice respectively; . Phosphorus uptake by shoots of plants was measured at mid-tillering stage, panicle differentiation stage and heading stage respectively.

[0029] In the mid-tiller stage of rice, four regenerated resin balls were evenly distributed at 7.5 cm below the soil surface at the young panicle differentiation stage and the heading stage, and then...

Embodiment 3

[0033] Embodiment 3, the relation of soil available phosphorus and soil absorbed state phosphorus

[0034] 1. Determination of adsorption isotherms of 20 kinds of soils:

[0035] Each soil was treated as follows:

[0036] Select 6g of each soil, and set up 6 control groups respectively; that is, place 1g of each soil in a 50ml centrifuge tube. Add 25ml of 0.02mol / L KCl solution containing different phosphorus concentrations to these 6 centrifuge tubes, so that the P concentration levels in these 6 centrifuge tubes are 0, 5, 10, 15, 20, 30 mg / L.

[0037] Then do another repetition according to the above treatment to ensure the accuracy of the calculation results.

[0038] Then the centrifuge tubes were shaken at 25°C for 24 hours, centrifuged, and the P concentration in the centrifuged liquid was measured, and the adsorption amount of phosphorus by the soil was calculated.

[0039] 2. Wash the remaining soil in each centrifuge tube once with 10ml alcohol, and discard the lot...

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Abstract

The invention discloses a method for using waste ion exchange resin ball to test soil available phosphorus, which comprises (1) regenerating waste ion exchange resin ball, (2) using lab assay method or using field in-situ assay method, (3) taking and washing the resin ball via some deionized water, eluting two times via alcaine solution at 0.5mol / L density, collecting all eluent, (4) using general molybdenum-antimony anti-colorimetry to test the phosphorus density in the eluent. The inventive method has low cost, simple operation and accurate test result.

Description

technical field [0001] The invention relates to a method for regenerating waste ion exchange resin balls and using the regenerated resin balls to measure soil available phosphorus. Background technique [0002] Soil available phosphorus, also known as available phosphorus, is the phosphorus component in soil that can be absorbed by plants, including all water-soluble phosphorus, partially adsorbed phosphorus and easily mineralized organic phosphorus. The content of available phosphorus in the soil reflects the phosphorus supply capacity of the soil to the crops of the season to a certain extent, and is an important indicator for judging the level of soil fertility. In agricultural production, the application of phosphorus fertilizers is generally guided by the index of available phosphorus in the soil. [0003] There are many methods for the determination of soil available phosphorus. Due to the different extraction agents and extraction methods, the application of the deter...

Claims

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Application Information

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IPC IPC(8): G01N21/25G01N1/02
Inventor 张奇春王光火姚槐应
Owner ZHEJIANG UNIV
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