Electrochemical heavy metal detector constructed based on graphene test paper electrode and detection method thereof

Abstract

The invention discloses an electrochemical heavy metal detector constructed based on a graphene test paper electrode and a detection method thereof; the electrochemical heavy metal detector includes an electrochemical detection system and a graphene printing paper electrode connected to an input end of the electrochemical detection system; the graphene test paper electrode includes a PET substrate, and a work electrode, a counter electrode, a reference electrode, a silver conductive baseline and an insulating layer printed on the PET substrate by a printing process; the working electrode is printed graphene, the counter electrode is printed carbon, the reference electrode is printed silver / silver chloride, and a layer of bismuth film is deposited on the surface of the working electrode. The electrochemical heavy metal detector is used for detecting the content of heavy metal ions in a lake water sample, the recovery rate of 10 times of repeated testing is 92.5%, the RSD is less than 5%, the testing time is less than 15 minutes, and the detection limit is less than 1 [mu]mol / L; the relative deviation is less than 5% compared with that of an atomic absorption method, so the electrochemical heavy metal detector has high accuracy and practicality.

Description

technical field [0001] The invention relates to the technical field of detection instruments, in particular to an electrochemical heavy metal detector constructed on the basis of graphene test paper electrodes and a detection method thereof. Background technique [0002] Due to the congenital deficiencies in equipment, cost, measurement cycle, sensitivity, etc. when the traditional method is applied in the field of environmental detection, the traditional method is greatly limited in this field. Therefore, people are looking for various methods to replace and develop traditional chemical and physical measurement methods. Electrochemical sensors have gained great popularity due to their traditional advantages in high sensitivity, short measurement period, and high reliability. For decades, it has become a research hotspot in the field of environmental detection and has been widely used. At present, the commonly used detection methods for heavy metal ions include atomic emiss...

AI Technical Summary

Problems solved by technology

Existing electrochemical detection instruments for heavy metals are usually connected to three electrodes through an electrochemical workstation. The electrodes generally use column electrodes, which have defects in detection sensitivity and portability. Therefore, a set of electrochemical testing principles is developed. It is imperative to develop a new type of heavy metal detection instrument to realize rapid, sensitive and accurate on-site detection of various heavy metal ions in complex water bodies, including lead (Pd2+), cadmium (Cd2+), and copper (Cu2+).

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