An expandable soil microbial fumigation device

Abstract

The invention discloses an expandable soil microorganism fumigating device which comprises a gas supply part, a sample cup and a gas extraction part, wherein the gas supply part comprises a gas row group and a reagent bottle; the gas row group is a line formed by connecting a plurality of three-way joints with a plurality of right-angle two-way joints; one end of each line is communicated with the reagent bottle; a valve is arranged between the reagent bottle and the line; perpendicular holes of the three-way joints are communicated with gas needles I through pipelines; the gas row group is arranged on a bracket plate; the gas extraction part comprises a gas row group and a vacuum pump; one end of the gas row group is communicated with the vacuum pump; a valve is arranged between the vacuum pump and the gas row group; the perpendicular holes of the three-way joints are communicated with gas needles II through pipelines. The expandable soil microorganism fumigating device disclosed by the invention adopts an active fumigating technology, namely fumigated gas enters the sample cup from the bottom of the sample cup, passes through a soil sample arranged on a screen and is discharged to the outside through a gas pipeline of the gas extraction part along with gas extraction. Compared with the conventional equipment, the expandable soil microorganism fumigating device has the advantages that the contact area of soil and chloroform is enlarged, and the steam flux is increased, and therefore, the fumigating efficiency can be improved, and the fumigating time can be shortened.

Description

technical field [0001] The invention relates to an expandable soil microbial fumigation device, which is suitable for the determination of microbial biomass carbon, nitrogen and phosphorus in soil. Background technique [0002] The existing desiccators are mostly made of glass, and there is a ceramic plate with a hole in the middle of the base, which can be taken out. There is a valve on the top cover to control the opening of the container. When in use, put the soil into a small beaker and put it into the desiccator. Apply vaseline to the upper and lower joints of the dryer to seal the container, open the upper valve to connect the vacuum pump to pump air, and close the valve and vacuum pump after 1 minute of chloroform boiling; the shortcomings of the existing equipment are: poor air tightness, glass material is easily damaged, and chloroform vapor when pumping air It does not pass through the soil, but only fills the container, and the fumigation is not thorough. Conten...

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Problems solved by technology

[0002] The existing desiccators are mostly made of glass, and there is a ceramic plate with a hole in the middle of the base, which can be taken out. There is a valve on the top cover to control the opening of the container. When in use, put the soil into a small beaker and put it into the desiccator. Apply vaseline to the upper and lower joints of the dryer to seal the container, open the upper valve to connect the vacuum pump to pump air, and close the valve and vacuum pump after 1 minute of chloroform boiling; the shortcomings of the existing equipment are: poor air tightness, glass material is easily damaged, and chloroform vapor when pumping air Does not pass through the soil, just fills the container, and the fumigation is not thorough

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