A soil column leaching device

Abstract

A soil column leaching device comprises a supporting base, a leaching pipe and a water distributor, wherein the leaching pipe is arranged on the supporting base, and the leaching pipe is connected with the supporting base through threads; the water distributor is connected with the top of the leaching pipe; the leaching pipe consists of an inner pipe and an outer pipe; the inner pipe is positioned inside the outer pipe; the outer pipe of the leaching pipe is divided into an upper part and a lower part which are not communicated with each other; when an air inlet in the upper part of the outer pipe of the leaching pipe is connected with a pump, the pressure of the inner pipe of the leaching pipe of the soil column leaching device can be increased according to experimental needs, so that the time needed by a soil column leaching experiment is effectively shortened; when the soil column leaching device samples a soil layer under the condition that the inner pipe of the leaching pipe of the soil column leaching device is pressurized, an air inlet in the lower part of the outer pipe of the leaching pipe is connected with a pump to increase the pressure outside sampling openings of the soil layer, so that the pressure difference inside and outside the sampling openings can be effectively reduced or even eliminated; at the moment, a sample is taken through a sampling window, so that the occurrence of a wall flow phenomenon and a soil column collapse phenomenon in the sampling process can be reduced.

Description

technical field [0001] The invention relates to a soil column leaching device. Background technique [0002] In recent years, the problem of soil pollution in my country has become increasingly prominent, posing a serious threat to the ecological environment, food safety and human health. [0003] The pollution of heavy metals and organic pollutants in the soil-plant-groundwater system is particularly prominent and increasingly serious. by [0004] Take soil heavy metal pollution as an example. At present, there are about 150 million mu of polluted arable land in China. [0005] The food amounted to 12 million tons, causing direct economic losses of more than 20 billion yuan. According to the environmental protection monitoring system of the Ministry of Agriculture in 2000 [0006] The survey of 82.23 million mu of soil in 329 seriously polluted areas in 24 provinces and cities in China found that the area of ​​farmland agricultural products polluted exceeding the standa...

AI Technical Summary

Problems solved by technology

Most of the current vertical soil columns are one-piece soil columns, which are prone to wall flow during soil column leaching experiments, and soil column collapses are prone to occur during the sampling process; when the diameter of the vertical soil column is large, the soil column The leaching experiment takes a long time

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