Method and apparatus for detecting the endpoint of COD analysis titration, and automated COD analyzer.
By irradiating a conical flask with 535 to 545 nm light to measure light transmission changes, the method and device address analyst variability in COD meters, achieving rapid and reproducible titration endpoint detection.
JP7831855B2Active Publication Date: 2026-03-17RA BOTEK CO LTD
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Patent Information
- Application Number
- JP2023179037
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2023-10-17
- Publication Date
- 2026-03-17
- Estimated Expiration
- 2043-10-17
AI Technical Summary
Technical Problem
Existing COD automated meters rely on oxidation-reduction potential difference or constant-current polarization potential difference methods for detecting the titration endpoint, which are not based on color change and are prone to analyst variability.
Method used
A method and device that irradiate a conical flask with light of 535 to 545 nm wavelength to detect the titration endpoint by measuring the change in light transmission, using a light-emitting element, diffusion means, and light-receiving element to identify the inflection point of light intensity.
Benefits of technology
Automatically detects the titration endpoint with high sensitivity and reproducibility, reducing analyst variability and enabling rapid detection.
✦ Generated by Eureka AI based on patent content.
Abstract
To provide a detection method and detection device for COD analysis titration end point, and a COD automatic analyzer that automatically detect a titration end point that is defined in "oxygen consumption by potassium permanganate at 100°C (CODMn)" in JIS K 0102 17.SOLUTION: A detection method for COD analysis titration end point according to the present invention is a method for detecting a titration end point that is defined in "oxygen consumption by potassium permanganate at 100°C (CODMn)" in JIS K 0102 17, and includes: irradiating an Erlenmeyer flask 115 containing a solution 141 with light with a wavelength of 535-545 nm; receiving light transmitting through the solution 141 and the Erlenmeyer flask 115; and detecting the titration end point from the amount of change in the quantity of received light with a wavelength of 535-545 nm.SELECTED DRAWING: Figure 1
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