Method for rapidly determining soil available phosphate

A rapid determination and effective phosphorus technology, which is used in the preparation of test samples, measurement of color/spectral properties, and analysis by chemical reaction of materials, etc. problems such as air bubbles, to achieve the effect of wide linear detection range, simplified measurement steps, and improved work efficiency

Active Publication Date: 2016-02-03
郑州欧柯奇仪器制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In rapid detection, the improved Olsen method is most used, but there are still shortcomings such as poor reproducibility
[0005] In general, there are the following problems in the prior art: (1) There are many types of reagents used in the existing assay methods, and the operation is cumbersome; (2) The color stability time of the reagents used in the existing assay methods is

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for quick determination of available phosphorus in soil, comprising the following steps:

[0025] (1) Extraction: Weigh 2.00g of air-dried soil sample passed through a 20-mesh sieve, put it in a conical flask, add 0.5g of phosphorus-free activated carbon, and then add 40mL of NaHCO with a concentration of 0.6mol / L 3 The aqueous solution is then shaken for 3 to 5 minutes under the conditions of a temperature of 20 to 25°C and a rotational speed of 180r / min, and then filtered, and the obtained filtrate is the solution to be tested for soil available phosphorus.

[0026] The preparation method of the phosphorus-free activated carbon is as follows: first soak the activated carbon with 2mol / L hydrochloric acid overnight, then wash it with distilled water several times, and wash it with 0.5mol / L NaHCO 3 Soak in the aqueous solution overnight, filter with suction, and wash with distilled water for several times until the washing liquid is phosphorus-free.

[0027] (2...

Embodiment 2

[0036] A kind of quick determination method of soil available phosphorus, except the following content, is basically the same as embodiment 1:

[0037] The configuration method of the soil available phosphorus developer: slowly pour 153 mL of concentrated sulfuric acid into 400 mL of distilled water while stirring, and dissolve 10 g of ammonium molybdate in about 300 mL of distilled water, and pour the prepared sulfuric acid solution into molybdenum ammonium acid solution, then add 100 mL of 5 g / L antimony potassium tartrate, and distill the volume to 1 L with distilled water.

Embodiment 3

[0039] A kind of quick determination method of soil available phosphorus, except the following content, is basically the same as embodiment 1:

[0040] The configuration method of the soil available phosphorus developer: slowly pour 153 mL of concentrated sulfuric acid into 400 mL of distilled water while stirring, and dissolve 20 g of ammonium molybdate in about 300 mL of distilled water, and pour the prepared sulfuric acid solution into molybdenum ammonium acid solution, then add 100 mL of 5 g / L antimony potassium tartrate, and distill the volume to 1 L with distilled water.

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PUM

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Abstract

The invention relates to a method for rapidly determining soil available phosphate, which is suitable for neutral and lime soil. The method comprises the following steps: 1) extraction: weighing a certain amount of a soil sample, adding phosphorus-free active carbon, adding a NaHCO3 aqueous solution with concentration being 0.6 mol/L, oscillating for 3-5 minutes, filtering a mixture; 2) colorimetric reaction: respectively taking a blank control solution, an phosphor standard solution and a liquid to-be-measured, respectively adding a soil available phosphate developer and a soil available phosphate reducing agent, standing the solution; and 3) colorimetric determination: adjusting an optical path wavelength of a photometer or a photoelectric colorimeter to 700 nm, performing colorimetric determination, and calculating or reading the available phosphate content in a soil sample to-be-measured. On base of rapid determination, the reagent stability is good, the quantity is less, the preservation period is long, the operating method is simple, the cost is low, and the method is suitable for neutral and lime soil.

Description

technical field [0001] The invention belongs to the technical field of rapid agricultural measurement, and in particular relates to a rapid determination method for soil available phosphorus suitable for neutral and calcareous soils. Background technique [0002] Soil is a complex complex composed of biotic and abiotic elements. It is the change of physical, chemical, and biological properties of the soil-forming parent material over time under the influence of climate, biology, and topography. A historical natural body with a certain cross-sectional shape, internal nature and fertility characteristics. Soil fertility is the result of the comprehensive effects of soil physical, chemical and biological factors, which can reflect the ability of soil to provide nutrients and environmental conditions for plant growth. Soil phosphorus is an important chemical indicator of soil fertility. It is not only an essential element for plant growth and development, but also limits the pr...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N21/31G01N1/28
Inventor 宋俊奇陈冲胡旭方任爽
Owner 郑州欧柯奇仪器制造有限公司
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