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Method for detecting content of soil alkali-hydrolyzable nitrogen

A method of determination, the technology of alkaline hydrolysis of nitrogen, applied in the direction of measuring devices, material analysis by observing the influence of chemical indicators, instruments, etc., can solve the problems of inaccurate detection data, incapable of batch analysis, and increased workload. Achieve the effect of reducing cost, reducing impact and reducing damage

Inactive Publication Date: 2014-10-22
NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problems that the existing alkaline solution diffusion method for analyzing soil alkaline nitrogen content cannot be analyzed in batches, increase the workload, have large errors and inaccurate detection data, and provide a measurement of soil alkaline nitrogen content method

Method used

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  • Method for detecting content of soil alkali-hydrolyzable nitrogen
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  • Method for detecting content of soil alkali-hydrolyzable nitrogen

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specific Embodiment approach 1

[0027] Specific implementation mode one: combine Figure 1 to Figure 4 , the present embodiment is a method for measuring soil alkaline hydrolysis nitrogen content, which is specifically completed according to the following steps:

[0028] A kind of measuring method of soil alkaline hydrolysis nitrogen content, specifically is finished according to the following steps:

[0029] 1. Preparation of the plastic diffusion dish sample to be soil alkali hydrolysis: ①. First, weigh 2.00g of the air-dried soil sample and 0.2g of ferrous sulfate powder passed through a 2mm aperture sieve; Mix the air-dried soil sample with 0.2g of ferrous sulfate powder evenly, and then spread it on the outer chamber of the plastic diffusion dish; add 2mL of boric acid-mixed indicator with a boric acid concentration of 20g / L to the inner chamber of the plastic diffusion dish, and then use a silicone cup Put the lid on the top of the plastic diffusion vessel, uncover the silicone cup cover to expose a s...

specific Embodiment approach 2

[0051] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the boric acid concentration described in step 1. is the preparation method of the boric acid-mixed indicator of 20g / L: dissolving 20g boric acid into 950mL hot distilled water After natural cooling, add 20mL of mixed indicator, after mixing well, add dropwise sodium hydroxide solution with a concentration of 0.1mol / L until the pH value of the boric acid-mixed indicator is 4.5, and then the boric acid-mixed indicator The mixed indicator is prepared by dissolving 0.09g of bromocresol green and 0.066g of methyl red in 100mL of ethanol solution with a mass fraction of 95%. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0052] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is: the concentration of the sulfuric acid standard solution described in step 2 ② is 0.01mol / L. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention relates to a method for detecting content of soil alkali-hydrolyzable nitrogen, which aims at solving the problems of the incapability of batch quantity analysis, the increase of workload, great error and insufficiently accurate detection data of the existing alkali hydrolysis diffusion method for analyzing the content of soil alkali-hydrolyzable nitrogen. The method comprises the following steps: 1. preparing a plastic diffusion vessel filled with samples to be subjected to soil alkali hydrolysis; 2. carrying out alkali hydrolysis; 3, preparing a blank control sample; 4. calculating the contents W1, W2, W3, W4 and W5 of soil alkali-hydrolyzable nitrogen of five samples by using a formula which is shown in the specification; and 5. averaging to obtain the content of soil alkali-hydrolyzable nitrogen. By virtue of the method, the content of the soil alkali-hydrolyzable nitrogen can be detected.

Description

technical field [0001] The invention relates to a method for measuring soil alkaline hydrolysis nitrogen content. Background technique [0002] Soil alkaline hydrolysis nitrogen content can reflect the soil nitrogen supply in the near future. It is one of the items that must be analyzed in the current national soil testing and formula fertilization project. At present, the existing conventional analysis method is the alkali hydrolysis diffusion method. Dip the glass rod in alkaline glue and spread it on the edge of the outer chamber of the diffusion dish. This operation method seriously restricts the efficiency of batch analysis and increases the workload. At the same time, some small differences are easy to be ignored, making the detection data inaccurate. The glass diffuser is easily damaged when cleaning the diffuser. Contents of the invention [0003] The purpose of the present invention is to solve the problems that the existing alkaline solution diffusion method for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79G01N21/01
Inventor 严君韩晓增郭爱雪赵家煦
Owner NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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