product overview

The DL2023 water quality cadmium automatic online analyzer is a project product of the Jiangsu Province Environmental Protection Research Project in 2011. It uses advanced sequential injection technology and electrochemical anodic stripping voltammetry technology to detect trace cadmium in water. This instrument can achieve real-time, fast, and accurate analysis of cadmium content in water quality.

Working principle

The DL2023 water quality cadmium automatic online analyzer adopts electrochemical stripping voltammetry for analysis. The determination of cadmium by stripping voltammetry is divided into two processes: (1) enrichment process: under a certain applied voltage, cadmium ions in the solution are first reduced and deposited on the electrode surface, forming intermetallic compounds. (2) Dissolution process: After the deposition process is completed, rest for a moment and apply a reverse scanning voltage. At this time, the deposited cadmium quickly dissolves from the electrode, thereby obtaining a large dissolution current. Qualitative and quantitative analysis can be conducted based on the peak potential and peak height of the dissolution current peak.

The water sample and current carrying liquid are injected into the electrolytic cell through a peristaltic pump and a sequential valve. The standard sample volume is controlled by a metering pump, and cadmium ions in the water are enriched on the electrode by mechanical stirring. After a moment of rest and reverse application of scanning voltage, the deposited cadmium is rapidly dissolved from the electrode, thereby obtaining a large dissolution current. Quantitative measurement is carried out using the principle that the peak current of metal cadmium element dissolution is proportional to the cadmium ion content in the solution within a certain range.

application area

Online rapid monitoring of cadmium in the discharge of water from pollution sources, especially at the discharge outlets of sewage treatment facilities in key industries such as electroplating, mining, electronics, batteries, smelting, and steel;

Online monitoring of cadmium in surface water,