Water sample heavy metal detection device and method and micro-nano sensor

Abstract

The invention provides a device, a method and a micro-nano sensor (1) for detecting heavy metals in a water sample. The device comprises the micro-nano sensor (1) arranged at the bottom of a mini reaction tank (7), wherein a plurality of micro-nano electrodes are arranged on a substrate (2) of the micro-nano sensor (1) in a sputtering layering manner, are arranged sequentially to form a micro-nanoelectrode array and comprise a detection electrode (3), a counter electrode (4), an all-solid-state reference electrode (5) and a digestion electrode (6) which is used for performing electrochemicaloxidation digestion on the heavy metals in the water sample before detection; part of the digestion electrode (6) and part of the detection electrode (3) are a plurality of parallel comb tooth strips,and the comb tooth strips and comb tooth slots of the digestion electrode (6) and the detection electrode (3) are mutually matched in a concave-convex manner; the electrodes are independent from oneanother without contact, and leading-out terminals of the electrodes are electrically connected with a heavy metal detection control circuit. The heavy metals in various forms in the to-be-detected water sample are digested into an ionic state and subjected to stripping voltammetry analysis detection; rapid, convenient and sensitive field detection and analysis of the heavy metals in the water sample can be realized.

Description

technical field [0001] The invention relates to a water sample heavy metal detection device and method and a micro-nano sensor thereof, belonging to the technical field of sensors. Background technique [0002] In recent years, with the rapid development of industry and agriculture in my country and the acceleration of urbanization, a large amount of industrial wastewater has been discharged into rivers, lakes and reservoirs, resulting in the occurrence of heavy metal pollutants exceeding the standard in many areas, which has brought great harm to the natural environment and human health. to serious harm. Therefore, the rapid detection and analysis of heavy metal content in water is of great significance to the prevention and treatment of water pollution. [0003] Due to the complexity of the water body environment, pretreatment of water samples is required before testing. Conventional pretreatment methods require the addition of a large amount of strong acid and heating, wh...

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Problems solved by technology

[0007] To sum up, there are researches both at home and abroad on the use of EAOPs for water quality pretreatment and electrochemical detection of heavy metals, but the integration of the two, that is, the in-situ rapid detection directly after the pretreatment is seldom

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