Water quality detection method for ocean lakes

Abstract

The invention discloses a water quality detection method for ocean lakes, which is specifically used for detecting heavy metal ions in seawater or lakes, and comprises the following steps: dropwise adding an electrode composite material into a bare glassy carbon electrode, using the electrode composite material as a working electrode, and detecting the concentration of the heavy metal ions to be detected in an acid-base buffer solution by using an electrochemical three-electrode system. The preparation process of the electrode composite material comprises the following steps: adding butyl titanate, zinc nitrate, strontium nitrate and erbium chloride into a tert-butyl alcohol/glycerol mixed solution, ultrasonically mixing uniformly, then adding an aqueous solution of CTAB (Cetyltrimethyl Ammonium Bromide), continuously stirring uniformly, dropwise adding an ammonia water solution, and adjusting the pH value to 7-9; transferring the mixed solution into a hydrothermal kettle, and carrying out hydrothermal reaction to obtain a Sr and Er co-doped TiO2-ZnO composite material; adding the Sr and Er co-doped TiO2-ZnO composite material into a silver nitrate solution, then introducing a reducing agent sodium citrate and PVP, and obtaining the Sr and Er co-doped TiO2-ZnO-nano Ag composite material through a reaction at the temperature of 80-90 DEG C. The Sr and Er co-doped TiO2-ZnO-nano Ag composite material has the catalytic ability and sensitivity to heavy metal ions in the solution, the detection limit is reduced, and the detection sensitivity to the heavy metal ions in seawater is improved, such as detection capability of mercury ions and copper ions.

Description

technical field [0001] The invention belongs to a water quality detection method of marine lakes, and in particular relates to a method for detecting heavy metal ions in seawater lakes. Background technique [0002] With the rapid development of modern society, many pollutants containing heavy metal ions enter seawater lakes, causing serious water pollution. Heavy metal ions are generally not easy to decompose, and they can be accumulated and ingested into the human body through the bioaccumulation of the food chain, which brings great hidden dangers to human health. Therefore, the rapid and highly sensitive detection of heavy metal ions in seawater and lakes is particularly important. [0003] At present, the methods used for heavy metal detection include atomic absorption spectroscopy, atomic fluorescence method, ultraviolet-visible spectrophotometry, etc., the detection cost of the above detection methods is high, the equipment is complicated, and the operation is time-c...

AI Technical Summary

Problems solved by technology

[0003] At present, the methods used for heavy metal detection include atomic absorption spectroscopy, atomic fluorescence method, ultraviolet-visible spectrophotometry, etc., the detection cost of the above detection methods is high, the equipment is complicated, and the operation is time-consuming. Compared with these methods, electrochemical detection is based on The electrochemical properties and changing laws of the substances in the solution are based on the quantitative relationship between electrical quantities such as potential, conductance, current and electricity and certain quantities of the measured substances, and the components are qualitatively and quantitatively analysis method

The electrochemical detection method has cheap equipment and simple operation, but its detection sensitivity needs to be further improved, and the core of improving detection sensitivity lies in the improvement of catalyst performance. At present, the preparation of nanomaterials with large specific surface area, high sensitivity and catalytic activity has become a Research focus of electrochemical detection of heavy metals

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