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Method and system for determining content of nitrate nitrogen in soil by using visible spectrophotometry

A spectrophotometry, nitrate nitrogen technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of difficult preservation, low reproducibility, troublesome preparation of test powder by nitric acid test powder method, etc. Simple operation, easy to buy effect

Inactive Publication Date: 2017-12-22
HUBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The test powder preparation of the nitric acid test powder method is cumbersome, and it is not easy to store, and the reproducibility is not high. After color development, it needs to be filtered before measurement

Method used

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  • Method and system for determining content of nitrate nitrogen in soil by using visible spectrophotometry
  • Method and system for determining content of nitrate nitrogen in soil by using visible spectrophotometry
  • Method and system for determining content of nitrate nitrogen in soil by using visible spectrophotometry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] Standard Curve Determination

[0088]

[0089] After returning the measured absorbance to zero, draw a standard curve as figure 2 .

[0090] It can be seen that the correlation coefficient is high, and the linear relationship between nitrate nitrogen content and absorbance is good. From the regression equation y=0.5237x+0.0001, it can be concluded that the molar absorptivity ε=6.82×10 4 Lmol -1 cm -1 , indicating a higher sensitivity.

Embodiment 2

[0092] Reproducibility studies

[0093] Take 3 soil samples, numbered A, B, C and do 3 repetitions for each soil sample, and carry out the reproducibility experiment. The results are shown in the following table

[0094]

[0095]

[0096] It can be seen that the coefficient of variation is less than 3%, indicating that the method has good reproducibility.

Embodiment 3

[0098] Recovery determination

[0099] Take a soil sample, weigh 5 times, prepare 5 parts of the test solution, absorb two parts of each part of the test solution, one part is directly measured for the content of nitrate nitrogen in the test solution, and the other part is measured after adding 5 μg of standard nitrate nitrogen , the results are as follows:

[0100]

[0101] It can be seen that the recovery rate is between 96% and 105%, and the average recovery rate reaches 99.81%, which shows that the recovery rate of the method is high.

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Abstract

The invention belongs to the technical field of determination of morphological analysis of soil nutrients and discloses a method and system for determining the content of nitrate nitrogen in soil by using visible spectrophotometry. The method comprises the following steps: preparing reagents: preparing thymol, sulfuric acid, sodium hydroxide, sodium sulfate, a nitrate nitrogen standard solution and the like; preparing a to-be-determined liquid: weighing a sample, adding the reagents, oscillating and filtering; drawing a standard curve: sucking standard series, adding the reagents, selecting wavelength and determining the absorbance; determining the sample: sucking the to-be-determined solution, adding the reagents, fixing the volume, uniformly shaking and determining the absorbance; calculating results: calculating a regression equation and the content of the nitrate nitrogen in the soil. The method disclosed by the invention does not need expensive instruments; the reagents are low in cost and easy to purchase; water bath heating and evaporation to dryness are not needed, so that simplicity and quickness in operation are realized; without correction, the results are still accurate. The invention overcomes the defects of current determination and provides the method with the advantages of being simple, quick, accurate and low in price for determining the content of the nitrate nitrogen in the soil.

Description

technical field [0001] The invention belongs to the technical field of soil nutrient form analysis and measurement, and in particular relates to a method and system for measuring soil nitrate nitrogen content by visible spectrophotometry. Background technique [0002] Soil nitrate nitrogen content is not only an important form of soil nitrogen transformation, but also a measure of soil nitrogen level, which is often used as the basis for the regulation of soil nitrogen. The current standard method for measuring soil nitrate nitrogen content is phenolic disulfonic acid spectrophotometry, in addition, there are ultraviolet spectrophotometry, ion chromatography, nitric acid test powder spectrophotometry and so on. [0003] In summary, the problems in the prior art are: [0004] Among the current standard methods for measuring soil nitrate nitrogen content, the phenol disulfonic acid method needs to be evaporated to dryness in a water bath. The operation is complicated and diff...

Claims

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Application Information

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IPC IPC(8): G01N21/31
CPCG01N21/31
Inventor 杨兰芳卢越韩潇翁娜
Owner HUBEI UNIV