Centrifugal soil solution extractor

Abstract

The invention provides a centrifugal soil solution extractor and relates to the field of agrochemical analysis. The centrifugal soil solution extractor comprises a sample collection tube, wherein thebottom of the sample collection tube is connected with a soil sample extraction piston; a soil solution collecting dish is connected to the outer side of the bottom of the sample collection tube in asleeving manner; a piston extraction rod is inserted into the bottom of the soil sample extraction piston; the bottom of the soil sample extraction piston is connected with a first circular ring; theinner side of the first circular ring sleeves with a second circular ring. When the device is used, the soil particles are intercepted and filtered by the filter layer, so that the soil solution enters the soil solution collecting dish by virtue of the centrifugal effect, and the soil solution collecting dish is detachably connected to the bottom of the sample collection tube and is used for collecting the soil solution filtered by the filter layer under the centrifugal action. According to the device, the problems that in the prior art, the soil solution extraction method is low in accuracy,complex in device, high in cost, small in extracted soil solution amount, long in time and the like can be solved.

Description

technical field [0001] The invention relates to the technical field of soil agricultural chemical analysis, in particular to a centrifugal soil solution extractor. Background technique [0002] Phosphorus is a large amount of nutrients necessary for plant growth. Available phosphorus is an important chemical index of soil fertility. The leaching liquid was measured, and the research experiment of soil available phosphorus determination method was carried out by Olsen method (0.5mol / LNaHCO 3 Leaching—molybdenum-antimony anti-colorimetric method) is a general method for domestic and foreign laboratories to measure neutral and calcareous soils, and the Bray method is a common method for acidic soils. So far, we have not been able to really measure the content of soil available phosphorus. Quantity, usually the so-called soil available phosphorus, just refers to the amount of phosphorus in the soil measured by a specific method, therefore, soil available phosphorus does not ref...

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Problems solved by technology

[0002] Phosphorus is a large amount of nutrients necessary for plant growth. Available phosphorus is an important chemical index of soil fertility. The leaching liquid was measured, and the research experiment of soil available phosphorus determination method was carried out by Olsen method (0.5mol / LNaHCO 3 Leaching—molybdenum-antimony anti-colorimetric method) is a general method for domestic and foreign laboratories to measure neutral and calcareous soils, and the Bray method is a common method for acidic soils. So far, we have not been able to really measure the content of soil available phosphorus. Quantity, usually the so-called soil available phosphorus, just refers to the amount of phosphorus in the soil measured by a specific method, therefore, soil available phosphorus does not refer to a specific form of phosphorus in the soil, and it does not have a real " The concept of "quantity", therefore, different measurement methods can be used on the same soil to obtain different available phosphorus quantities, so the soil available phosphorus level is only a relative indicator, which has statistical significance to a certain extent and does not refer to the "true phosphorus" in the soil. "Absolute content" of available phosphorus

[0003] Soil solution is where most soil chemical reactions and soil formation processes occur. It is the carrier of material exchange between soil and the environment, and the basis for material migration and movement. Different from soil solid phase, soil solution can reflect the true nutrient state of soil. However, At present, the soil solution collection method at home and abroad mainly uses clay head as the infiltration device. By applying negative pressure to the inner cavity of the clay head, the solution in the soil is filtered through the clay head and enters the infiltration pipe, and then the water in it is filtered. Solution suction, most clay heads have strong adsorption performance on phosphorus, a small amount of non-absorptive devices are expensive, and it takes a long time to extract the liquid, and the amount is small, it is difficult to meet the test of indicators with large demand, such as China Patent CN201610310382.7 discloses a centrifugal casing device for centrifugal extraction of soil solution. Although it proposes some solutions, the device is cumbersome, the operation is complicated, the water output is small, and it will absorb filtrate substances, and it is only for soil pollutants. Research on the migration process in soil solution, the scope of application is small

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