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Soil heavy-metal electrochemical in-situ detection system and method

An electrochemical and in-situ detection technology for heavy metals, which is applied in the field of detection systems for heavy metal ions, can solve the problems of multiple heavy metals in secondary pollution, high detection costs, and long detection cycles, and achieve low cost, wide detection range, and easy carrying effect

Active Publication Date: 2018-05-29
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The laboratory detection method has high accuracy, but the detection cycle is long, the operation is complicated, and specialized personnel are required to operate, the detection cost is high, and secondary pollution is likely to occur during the detection process, and multiple heavy metals cannot be measured at the same time

Method used

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  • Soil heavy-metal electrochemical in-situ detection system and method
  • Soil heavy-metal electrochemical in-situ detection system and method
  • Soil heavy-metal electrochemical in-situ detection system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Such as figure 1 As shown, the soil heavy metal detection system consists of a three-electrode system, signal acquisition and processing equipment and a host computer control system. The signal acquisition and processing equipment includes an STM32 microcontroller and its minimum system, a digital-to-analog converter, an analog-to-digital converter, a potentiostat module, a serial communication module and a sensor connection port; the STM32 microcontroller and a digital-analog The converter is connected, and the digital-to-analog converter is connected to the potentiostat module, and the potentiostat module is connected to the counter electrode and the reference electrode of the three-electrode sensor; the working electrode of the three-electrode sensor is connected to the analog-to-digital converter, The analog-to-digital converter is connected with the STM32 microcontroller, and the serial port communication module is connected with the host computer control system. ...

Embodiment 2

[0066] Such as figure 2 Shown is a schematic diagram of the identification and acquisition of the stripping current of the standard solution of known heavy metal components. Configuration with Cd 2+ , Pb 2+ 、Cu 2+ 、 Bi 3+ mixed solution. Each heavy metal has its specific stripping potential, according to the stripping potential to determine which heavy metal it is. As shown in the figure are the stripping voltammograms of heavy metal cadmium ions and lead ions. The deposition potential is -1.2V, the deposition time is 140s, the rest time is 10s, the scanning start voltage is -1.2Vvs.Ag / AgCl, the end voltage is 0.2Vvs.Ag / AgCl, the potential increment is 0.005V, the pulse frequency is 25Hz, and the sampling The time is 0.02s, and the pulse amplitude is 0.025V. The dissolution profile consists of 280 data points. After each dissolution voltammetry measurement, the system will automatically store the output voltammetry data, namely 280 current values ​​and corresponding po...

Embodiment 3

[0068] Embodiment 3 uses standard addition method to analyze heavy metal concentration

[0069] 1) First click the connect button, set S-G smoothing, set the maximum range to 1mA, choose to subtract the background current, repeat the detection times to 1, and set the stripping voltage parameters as follows, among them, the deposition potential is -1.2V, the deposition time is 140s, and the static The setting time is 10s, the scanning start voltage is -1.2Vvs.Ag / AgCl, the end voltage is 0.2Vvs.Ag / AgCl, the potential increment is 0.005V, the pulse frequency is 25Hz, the sampling time is 0.02s, and the pulse amplitude is 0.025V. The heavy metal stripping potential range is set as follows, wherein, cadmium: -0.7V ~ -0.9V; lead: -0.5V ~ -0.7V; bismuth: -0.05V ~ -0.25V; copper: 0.05V ~ -0.05V.

[0070]2) Click the "first detection" button in the standard addition method module to first detect the actual sample extract with unknown concentration, and the host computer control system ...

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Abstract

The invention provides a soil heavy-metal electrochemical in-situ detection system which comprises a three-electrode sensor, signal collecting and processing equipment and an upper computer control system. The signal collecting and processing equipment comprises a STM32 microcontroller and minimum system, a digital-analog converter, an analog-digital converter, a constant potentiometer module, a serial port communication module and a sensor connection module. The invention further provides a soil heavy-metal electrochemical in-situ detection method. The system integrates stripping voltammetrysignals with a background current recognition algorithm, has an electrode cleaning function and an actual sample pretreating function which are independent, has three heavy metal analysis methods andcan meet different detection needs. The system can accurately detect content of heavy metal like lead and cadmium in a soil sample and overcomes the defects of existing heavy metal detection methods and prior art in soil heavy metal detection.

Description

technical field [0001] The invention belongs to the technical field of detection, and in particular relates to a detection system and method for heavy metal ions in soil. Background technique [0002] In recent years, with the rapid development of industry, agriculture and transportation, harmful heavy metals (such as Zn, Cu, Pb, Cd, Cr, etc.) entering the soil environment through various channels have been increasing, causing increasingly serious pollution to agricultural products. The improvement of living standards has also prompted people to pay more attention to the health and quality of fruits and agricultural products. The soil environment directly affects the growth and quality of plants. When heavy metals accumulate to a certain extent, they will pollute the soil, affect the growth and quality of fruit trees and agricultural products, and then cause harm to human health through the food chain. [0003] The traditional soil heavy metal detection at home and abroad u...

Claims

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Application Information

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IPC IPC(8): G01N27/48
CPCG01N27/48
Inventor 刘刚赵国王辉
Owner CHINA AGRI UNIV
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