Soil heavy metal in-situ monitor

A monitoring instrument and heavy metal technology, which is applied in the field of soil monitoring and treatment, can solve the problems of cumbersome treatment process, difficult in-situ monitoring of heavy metals, and long time consumption

Active Publication Date: 2020-04-07
深圳市北京大学深圳研究院分析测试中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the prior art, methods such as spectrophotometry, atomic absorption spectrometry, atomic fluorescence spectrometry, inductively coupled plasma atomic emission spectrometry, and inductively coupled plasma mass spectrometry are usually used to analyze and detect heavy metal elements in soil, bu

Method used

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  • Soil heavy metal in-situ monitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The structure of the soil heavy metal in-situ monitor of the present embodiment is as follows: figure 1 As shown, it includes a single-chamber bioelectrochemical sensing system and controller.

[0063] Among them, the single-chamber bioelectrochemical sensing system includes an anode 1, a cathode 2, an anode chamber 7 and a proton exchange membrane (PEM, Nafion 117) 3, the anode 1 is graphite felt, the cathode 2 is carbon cloth, and the anode chamber 7 is five A cavity made of surface acrylic material, which contains microorganisms and anolyte.

[0064] The anode 1 is arranged outside the anode chamber 7 and is connected to it via a wire, the proton exchange membrane 3 is interposed between the anode 1 and the cathode 2, and the anode 1, the proton exchange membrane 3 and the cathode 2 are pressed together and arranged in the anode chamber 7 outside, and connected and sealed with the cavity and the mouth-shaped end plate through a rubber gasket. The opening of the end...

Embodiment 2

[0069] The structure of the soil heavy metal in-situ monitor of the present embodiment is as follows: figure 2 As shown, it includes a single-chamber bioelectrochemical sensing system and controller.

[0070] Among them, the single-chamber bioelectrochemical sensing system includes an anode 1, a cathode 2, an anode chamber 7 and a proton exchange membrane (PEM) 3, the anode 1 is graphite felt, the cathode 2 is a carbon rod, and the anode chamber 7 is made of five-sided acrylic material chamber, which contains microorganisms and anolyte.

[0071] The anode 1 is arranged in the anode chamber 7 , and the proton exchange membrane 3 closes the cavity of the anode chamber 7 . The cathode 2 is located outside the anode chamber 7, and is connected to the anode chamber 7 by an adjustable length bracket 9, so as to adjust the distance between the anode and the cathode according to the conditions of the sample to be tested.

[0072] The controller includes an external resistance 5 and...

Embodiment 3

[0074] Embodiment 3 uses the monitoring instrument of embodiment 2 to monitor soil heavy metal content in situ

[0075] Inoculation and acclimatization: using the monitor in Example 2, two kinds of anaerobic sludge from sewage treatment plants are used to inoculate the anode of the monitor, and the anolyte with sodium acetate as the substrate is used for cultivation. After the anolyte is passed through nitrogen to remove the air, it is mixed with anaerobic sludge in the anode chamber, and the circuit between the anode and cathode is disconnected and connected after 2 days, and the concentration of sodium acetate is lower than 500mg / L to supplement the anolyte to maintain the concentration of sodium acetate at 500- Between 1000mg / L, after 3 weeks of inoculation and domestication, the open circuit voltages of the devices were measured to be 550mV and 620mV respectively, and the monitors started after domestication were obtained. for 1250 ohms and 1000 ohms.

[0076] The humidit...

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Abstract

The invention discloses a soil heavy metal in-situ monitor. The soil heavy metal in-situ monitor comprises a single-chamber bioelectrochemical sensing system and a controller. The single-chamber bioelectrochemical sensing system comprises an anode, an anode chamber, a cathode and an ion exchange membrane. The anode is arranged in the anode chamber or outside the anode chamber, the anode chamber isclosed or open, and the ion exchange membrane can be a proton exchange membrane (PEM). The controller comprises an external resistor and a data acquisition device. The anode and the cathode are connected with the two ends of the external resistor through a circuit, and the data acquisition device is arranged on the circuit. The monitor can be buried in soil for a long time, can realize continuousreal-time monitoring of soil heavy metals, and is high in automation degree.

Description

technical field [0001] The invention belongs to the field of soil monitoring and treatment, and in particular relates to an in-situ monitor for heavy metals in soil. Background technique [0002] Soil heavy metal pollution is mainly due to human activities, making the content of trace metal elements in the soil exceed the background value, excessive deposition of heavy metal content caused by excessively high, significantly higher than the original content, and resulting in deterioration of the quality of the ecological environment. With the development of urban industrialization, the increase of mining, smelting and processing activities, and the massive discharge of waste water, waste gas and waste residue, the heavy metals in the soil mainly include the following four sources: heavy metals entering the soil with atmospheric deposition, and entering the soil with sewage heavy metals, heavy metals that enter the soil with solid waste, and heavy metals that enter the soil wi...

Claims

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Application Information

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IPC IPC(8): G01N27/327G01N27/48
CPCG01N27/327G01N27/48Y02A50/20
Inventor 陈振波栾胜基
Owner 深圳市北京大学深圳研究院分析测试中心有限公司
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