Soil column leaching device

Abstract

The invention discloses a soil column leaching device, which comprises a device body; the upper part of the device body is a leaching area, the lower part of the device body is a filtrate filtration area; the top of the device body is provided with an externally-connected type water distributor, the leaching area is communicated with a filtrate collecting area through a sieve and a porous plate; the leaching area is, from top to bottom, sequentially divided into a buffer layer, a surface soil layer, a subsoil layer, a fine quartz sand layer and a coarse quartz sand layer, and adjacent layers are respectively separated by at least one layers of sieve; the surface soil layer and the subsoil layer are respectively provided with a plurality of sampling ports; the filtrate collecting area includes a filter layer at the upper end and a filtrate collector at the bottom end, a downward-extending part of the top part of the filtrate collecting area is used as a support frame, the filter layer is positioned below the porous plate, the filtrate collector is located just below the filter layer, the filter layer is communicated with the device body through the porous plate and the sieve. The beneficial effects of the soil column leaching device are that: soil stratified sampling can be performed without segmentation of the device; by arrangement of the externally-connected type water distributor and the filtrate collecting area, water distribution is uniform, and solid-liquid separation can be achieved, and the soil column leaching device is convenient for experiment analysis.

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. The pollution of heavy metals and organic pollutants in the soil-plant-groundwater system is particularly prominent and increasingly serious. Take heavy metal pollution in soil as an example. At present, there are about 150 million mu of polluted cultivated land in China, and 12 million tons of grains are polluted by heavy metals every year, causing direct economic losses of more than 20 billion yuan. According to the environmental protection monitoring system of the Ministry of Agriculture, a survey of 82.23 million mu of soil in 329 seriously polluted areas in 24 provinces and cities in the country in 2000 found that the area of ​​farmland agricultural products polluted exceeding the stan...

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Problems solved by technology

[0004] Aiming at the problem that the current soil injection device may accidentally collapse the soil column during the sampling process and cause sample pollution, the present invention proposes a simple structure, easy to use, integrated plant planting, layered sampling and leachate collection functions. Soil column leaching device for studying the migration behavior of pollutants in soil-plant-groundwater system

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