Trace heavy metal detecting system based on chronopotentiometric stripping analysis method, and detection method thereof

Abstract

The invention discloses a trace heavy metal detecting system based on a chronopotentiometric stripping analysis method. The trace heavy metal detecting system comprises a chronopotentiometric stripping analysis device and a screen printing electrode, wherein the chronopotentiometric stripping analysis device comprises a housing, a working main board positioned in the housing, an electrode insertion groove, a built-in power supply, an input unit and an output unit, the electrode insertion groove, the built-in power supply, the input unit and the output unit adopt the housing as the platform andare respectively arranged on the housing, the screen printing electrode comprises a substrate, the substrate is printed with a working electrode, a counter electrode and a reference electrode, the three electrodes are respectively covered with an insulating layer, one ends of the three electrodes form and the opening holes arranged on the insulating layers form an electrolytic cell cavity, a sample to be detected is added into the electrolytic cell cavity in a dropwise manner, the screen printing electrode is inserted into the electrode insertion groove of the housing, and the reference electrode joint is connected to the constant potential module of the working main board. According to the present invention, the detection system has characteristics of simple composition and easy miniaturization, and is matched to the screen printing electrode, such that the electrode pretreatment is avoided, and the use is convenient.

Description

technical field [0001] The invention relates to the field of heavy metal detection, in particular to the field of on-site rapid detection of trace heavy metals. Background technique [0002] Heavy metals widely exist in nature, which means that the density is greater than 5g / cm 3 There are about 45 kinds of metals, such as copper, lead, zinc, cadmium, manganese, iron, cobalt, mercury, gold, silver and so on. Most heavy metals such as lead, cadmium, mercury, etc. are not necessary for life activities and threaten the survival of organisms and human health. With the process of industrialization, the mining, smelting, processing and commercial manufacturing activities of heavy metals are increasing, and the problem of heavy metal pollution of the environment has become increasingly prominent, causing many heavy metals to enter the atmosphere, water, and soil. Water bodies and soil polluted by heavy metals will be in the air. Further accumulation in plants and aquatic products...

AI Technical Summary

Problems solved by technology

The conventional pretreatment method is to use strong oxidizing acid or mixed acid to process under high temperature and high pressure to process many substances into small molecules to avoid interference, such as patent CN200710164548.X, a method for detecting lead content in tea, patent CN 201310574732 A method for rapid detection of lead and cadmium by scanning anode stripping voltammetry. This method, the treatment solution obtained by this pretreatment is not suitable for the detection of potential stripping method due to its strong oxidation, and only suitable for stripping voltammetry. At the same time The pretreatment process is cumbersome and is not suitable for on-site use; while the pretreatment of the potential stripping method mostly adopts metal replacement technology, such as patent CN200410027136. It is to replace and dissociate the heavy metal ions in the sample into the treatment solution, which will not change the oxidative properties of the detection solution, meet the experimental conditions of potential stripping, and is also suitable for the analysis and detection of stripping voltammetry, but this pretreatment is only for heavy metal ions, not suitable Treatment of heavy metals in other valence states

Images