Closed Electrolysis Cell for DOC and TOC Analysis
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Solution Overview
Problem
Current methods for determining DOC, TOC, and IC in water samples are complex, energy-intensive, and not suitable for mobile use due to high energy consumption and the need for large oxygen quantities, with existing anodic oxidation methods requiring continuous gas streams and precise CO2 measurement.
Innovation Solution
A method and device utilizing anodic oxidation in a closed electrolyte cell where CO2 is collected in a gas space, allowing for measurement of the CO2 increase rate to determine carbon content, with a compact, lightweight design and separate sample containers to prevent contamination and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional incineration methods are used at high temperatures (700-1000°C), then complete oxidation of carbon to CO2 is achieved, but energy consumption becomes excessively high
Solution Approach 1:
The patent changes the temperature parameter from high (700-1000°C incineration) to low (20-100°C electrochemical oxidation), and changes the oxidation mechanism from thermal to electrochemical, achieving complete carbon oxidation at much lower energy input
Solution Approach 2:
The patent replaces the thermal/combustion system with an electrochemical system, using electrical energy to drive oxidation reactions at the electrode surface instead of relying on high-temperature thermal processes
2Measurement precision
If continuous gas streams are used to transport CO2 to sensors, then real-time measurement is achieved, but device complexity and power consumption increase
Solution Approach 1:
The patent extracts the CO2 directly at the electrode surface where it is generated, using a localized sensor positioned immediately adjacent to the electrode, eliminating the need for complex gas transport systems
Solution Approach 2:
The patent merges the CO2 generation site (electrode) with the CO2 detection site (sensor) into a single integrated location, allowing direct measurement without intermediate transport steps
3Ease of operation
If open sample containers are used, then ease of operation is improved, but atmospheric CO2 interferes with measurements
Solution Approach 1:
The patent creates a localized closed environment around the electrode and sensor where CO2 accumulates, while leaving the rest of the sample container open for easy operation, thus isolating the measurement zone from atmospheric CO2 interference
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables efficient, user-friendly, and reproducible measurements with reduced energy consumption, allowing for short analysis times and improved precision using the same quality sensors, while preventing atmospheric CO2 interference and eliminating the need for external oxygen sources.
Implementation Method 1
electrochemical method for determining the DOC and/or TOC and/or IC content in a water sample by means of anodic oxidation on electrodes
Implementation Method 2
carbon is at least partially oxidized to carbon dioxide
Implementation Method 3
at least one CO2-selective sensor is provided for measuring the amount of CO2 formed
Data Source
AI summary
The invention relates to an electrochemical method for determining the DOC and/or TOC and/or IC content in a water sample by means of anodic oxidation on electrodes in a closed electrolysis cell, wherein the carbon is oxidized at least partially to carbon dioxide (CO2).The carbon dioxide thereby formed is collected in a closed gas space, wherein, in the range of the essentially linear increase in the CO2 content in the gas space, the rate at which this increase takes place is determined and used in an analyzer unit to determine the DOC and/or TOC and/or IC content.