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System and method for determining organic matter in soil
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An organic matter and soil technology, which is applied in the system field of measuring organic matter in soil, can solve the problems of safety of the measuring system, difficult control of addition amount, incomplete oxidation, etc., and achieves the effects of improving test accuracy, simple structure and easy operation.
Pending Publication Date: 2018-05-29
INST OF SOIL FERTILIZER & RESOURCE ENVIRONMENT JIANGXI ACAD OF AGRI SCI
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Problems solved by technology
[0007] Therefore, the technical problem to be solved by the present invention is that the oxidation of soil organic matter in the prior art is incomplete, and the Ag 2 SO 4 The amount of addition is not easy to control, and there are safety problems in the measurement system, so as to provide a safe and simple system for the determination of organic matter in soil, so as to achieve rapid and accurate determination of organic matter in soil
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Embodiment 1
[0044] The invention provides a system for measuring organic matter in soil, such as figure 1 As shown, a heating device 1, a support 2, a flask 3 and a funnel 4 are included.
[0045] The heating device 1 is an electric blast constant temperature drying box, and the support 2 is located in the heating device 1; the outside of the neck 31 of the flask 3 is fixed on the support 2 without any contact with the inner wall of the heating device 1, and the inside of the neck 31 of the flask 3 is Frosted surface, the inner cavity 32 connected with the neck opening 31 is spherical. Such as figure 2 As shown, the funnel 4 has a wide mouth portion 41, a neck portion 42, and a neck portion 43. The outer wall of the neck portion 42 is a frosted surface, which is sealed and connected with the inner side of the neck mouth 31 of the flask 3; The arc-shaped pipeline connected at the end, the distance between the two ends of the neck 43 is 20cm, and the degree of arc is 30 °; In the middle...
Embodiment 2
[0065] The present invention provides a system for measuring organic matter in soil, which is different from Example 1 in that:
[0066] In the measuring system adopted, the length of the neck 43 of the funnel 4 in the vertical direction is 15 cm, and the degree of arc is 5°;
[0067] In step (II), add 0.5000 g of air-dried soil sample of 20 mesh, 2.5mol / LHNO 3 Solution 0.38mL, Ag 2 SO 4 0.15g, add 0.8000mol / L (1 / 6K 2 Cr 2 o 7 ) standard solution 41.7mL, concentrated H 2 SO 4 8.3mL, and then placed in a constant temperature blast drying oven that has been preheated to 108°C. After the solution boils, start timing when you see the first drop of condensate falling from the puncture point, take it out after 152 minutes, and cool to room temperature.
Embodiment 3
[0069] The present invention provides a system for measuring organic matter in soil, which is different from Example 1 in that:
[0070] In the measuring system adopted, the length of the neck 43 of the funnel 4 in the vertical direction is 30cm, and the degree of arc is 30°;
[0071] In step (II), add 0.5000 g of air-dried soil samples of 20 mesh, 1.6 mol / LHNO 3 Solution 2.0mL, Ag 2 SO 4 0.5g, add 0.8000mol / L (1 / 6K 2 Cr 2 o 7 ) standard solution 37.5mL, concentrated H 2 SO 4 7.5mL, and then put it into a constant temperature blast drying oven that has been preheated to 112°C. After the solution boils, start timing when you see the first drop of condensate falling from the puncture point, take it out after 148 minutes, and cool to room temperature.
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Abstract
The invention belongs to the field of soil detection, and particularly relates to a system and a method for determining organic matters in soil. The system for determining the organic matters in soilprovided by the invention comprises a heating device, a flask and a funnel, wherein the funnel is provided with a wide opening part, a reduced opening part and a neck part; the outer wall of the reduced opening part is in frosting connection with the inner side of the flask neck opening; the neck part is communicated with the bottom end of the reduced opening part, is arranged in an inner cavity of the flask in a suspended way and is independent from the side wall of the flask; the bottom end is of a puncture part; the end surface of the puncture part is in vertical arrangement; the steam is gathered on the end surface of the puncture part and can easily form liquid drips to directly slide and fall under the gravity effect; the problem of different retention time is solved; the timing is accurate; particularly for large-batch experiments, the parallel error is small. The invention also provides a method for determining the organic matters in the soil; oxidization auxiliary agents are added; the soil sample oxidization is more complete; the operation is simplified; the test precision is high; the repeatability is high.
Description
technical field [0001] The invention belongs to the field of soil detection, and in particular relates to a system and method for measuring organic matter in soil. Background technique [0002] The level of soil organic matter content is an important index to measure soil fertility, and the fixation and change of soil organic carbon are related to the change of atmospheric carbon dioxide concentration. Therefore, rapid and accurate determination of soil organic matter content is the key to obtain soil fertility changes and soil organic carbon fixation, which is of great significance in evaluating soil fertility and slowing down the rise of atmospheric carbon dioxide concentration. [0003] There are many methods for the determination of soil organic matter, the common ones are gravimetric method, colorimetric method and volumetric method. At present, the high-temperature external heat potassium dichromate oxidation-volume method is most used in the field of soil organic mat...
Claims
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Application Information
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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/79G01N1/38
CPCG01N1/38G01N21/79
Inventor 王少先张文学杨成春王萍苏金平夏文建刘增兵邱才飞范芳冯兆滨
Owner INST OF SOIL FERTILIZER & RESOURCE ENVIRONMENT JIANGXI ACAD OF AGRI SCI
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