Optical Peroxide Concentration Measurement Using Triiodide Absorbance
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Solution Overview
Problem
Current methods for measuring percarboxylic acid concentration in aqueous solutions, such as peracetic acid, are either expensive, require skilled operators, or provide inaccurate and subjective results, making it difficult for general users in fields like food hygiene and medicine to achieve precise concentration control.
Innovation Solution
A method using Brilliant Blue FCF as an internal standard substance in combination with potassium iodide, measuring absorbance at specific wavelengths to calculate percarboxylic acid concentration, which eliminates operator-dependent errors and allows for accurate measurement without complex equipment or expertise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If titration device is used to measure percarboxylic acid concentration, then measurement precision is improved, but device complexity and operation difficulty increase
Solution Approach 1:
The patent replaces complex mechanical titration devices with a simplified optical measurement system. The method uses a colorimetric reaction where percarboxylic acid reacts with potassium iodide to generate iodine, which then reacts with excess iodide to form triiodide ions. The concentration is determined by measuring the absorbance of triiodide at 353 nm using a simple spectrophotometer, eliminating the need for complex titration apparatus while maintaining measurement accuracy.
Solution Approach 2:
The patent changes the measurement parameter from direct titration volume to optical absorbance. By measuring the absorbance of the colored triiodide complex at a specific wavelength (353 nm), the system transforms a mechanical measurement process into an optical one, simplifying the device requirements while improving precision through objective optical detection rather than subjective endpoint determination.
2Measurement precision
If ultraviolet absorption method is used for direct measurement, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent shifts the measurement wavelength from ultraviolet (180-210 nm) to visible range (353 nm). This parameter change allows the use of simpler, less expensive equipment. The colorimetric reaction produces triiodide ions that absorb strongly in the visible range, enabling measurement with standard spectrophotometers rather than requiring specialized UV detectors and deuterium lamp sources.
Solution Approach 2:
The patent introduces potassium iodide as an intermediary substance that mediates the measurement process. Percarboxylic acid reacts with potassium iodide to generate iodine, which then forms the colored triiodide complex. This intermediary transformation converts the measurement from direct UV absorption of peracetic acid to visible absorption of the triiodide complex, simplifying the instrumentation required.
3Ease of operation
If color evaluation method is used, then ease of operation is improved, but measurement precision deteriorates
Solution Approach 1:
The patent replaces subjective visual color evaluation with objective optical measurement. Instead of relying on operators to visually assess color intensity, the system uses a spectrophotometer to measure the absorbance at 353 nm, providing quantitative, objective data that eliminates human subjectivity while maintaining operational simplicity.
Solution Approach 2:
The patent uses the triiodide complex as an intermediary that provides a strong, well-defined absorption signal at 353 nm. This intermediary substance creates a measurable optical signal that is directly proportional to the percarboxylic acid concentration, enabling precise quantitative measurement while preserving the simplicity of the colorimetric approach.
4Measurement precision
If reaction kinetic method with iodide ion generation is used, then measurement precision is improved, but device complexity and operation difficulty increase
Solution Approach 1:
The patent changes the measurement approach from monitoring reaction kinetics over time to measuring the final equilibrium absorbance of the triiodide complex. By allowing the reaction to go to completion and measuring the steady-state absorbance at 353 nm, the system eliminates the need for time-resolved measurements and complex kinetic calculations, simplifying both the measurement process and data analysis.
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
Enables highly accurate and easy measurement of percarboxylic acid concentration in aqueous solutions, correcting for pipetting errors and providing reliable concentration control in disinfectants or bactericides, suitable for use in food hygiene and medical fields without requiring advanced skills or equipment.
Implementation Method 1
measuring the intensity (second light intensity) of transmitted light or reflected light at a wavelength (second wavelength) in a wavelength range of 440 to 600 nm, preferably a wavelength range of 470 nm, derived from the reaction product (iodine)
Data Source
AI summary
The present invention relates to a reagent for measurement of a percarboxylic acid concentration of a percarboxylic acid-containing aqueous solution with high accuracy using an optical method, and a method for measuring and a device capable of measuring using the reagent. As an indicator solution to be used for measuring a percarboxylic acid concentration in a percarboxylic acid-containing aqueous solution (test sample), the indicator solution is used that contains Brilliant Blue FCF as an internal standard substance and an iodide salt as a coloring substance.