A soil column leaching device

Abstract

A soil column leach device includes a support base, a leach pipe, and a water distributor. The leach pipe is placed on the support base, and the leach pipe and the support base are connected through threads. The water distributor is connected to the top of the leach pipe; The leach tube is composed of an inner tube and an outer tube, and the inner tube is placed inside the outer tube. The outer pipe of the leach pipe is divided into two upper and lower parts that are not connected to each other. When the air inlet on the upper part of the outer pipe of the leach pipe is connected to the pump, the pressure of the inner pipe of the leach pipe of the soil column leach device can be increased according to the experimental needs. , thereby effectively reducing the time required to perform soil column leach experiments; a soil column leach device of the present invention can be used to sample the soil layer while pressurizing the inner tube of the leach pipe of the soil column leach device. The air inlet at the lower part of the outer tube is connected to the pump, which increases the pressure outside the soil layer sampling port, which can effectively reduce or even eliminate the pressure difference between the inside and outside of the sampling port. At this time, sampling through the sampling window can reduce the phenomenon of wall flow and The occurrence of soil column collapse.

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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