Colorimetric Hydrogen Peroxide Detection in Water
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Solution Overview
Problem
Existing methods are inadequate for quickly measuring low concentrations of hydrogen peroxide in drinking water with an accuracy better than ±3 ppm, particularly at levels around 10 ppm or less, and are affected by pH, temperature, and water composition.
Innovation Solution
A colorimetric assay method using a reagent compound like potassium bis(oxalato)oxotitanate (IV) DI, with a selected wavelength of 470 nm, and a reagent mixture including EDTA di-sodium salt dihydrate and polyoxyethylene (23) lauryl ether in sulfuric acid solvent, to produce a reaction product that absorbs light proportionally to hydrogen peroxide concentration, allowing for precise measurement using a standard curve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing detection methods (chemiluminescent, fluorometric, amperometric, colorimetric sensors) are used, then measurement capability is provided, but measurement precision deteriorates at low concentrations (accuracy worse than ±3 ppm, unable to achieve 0.1 ppm accuracy)
Solution Approach 1:
The invention changes the chemical reaction parameters by using a titanium-based colorimetric reagent system that produces a highly intense color change even at very low hydrogen peroxide concentrations. The reagent composition and reaction conditions are optimized to maximize the molar absorptivity, enabling accurate measurement down to 0.1 ppm concentration levels
Solution Approach 2:
The invention introduces a titanium-based complex as an intermediary substance that reacts with hydrogen peroxide to produce a measurable colorimetric signal. This intermediary reaction amplifies the detection signal, allowing trace amounts of hydrogen peroxide to be detected with high precision through light absorbance measurement
2Adaptability or versatility
If existing sensors are designed for swimming pool water treatment (150 ppm maximum), then detection capability is provided, but adaptability deteriorates for drinking water applications (2-10 ppm range)
Solution Approach 1:
The invention creates a universal measurement system that can accurately detect hydrogen peroxide across a wide concentration range from 0.1 ppm to 150 ppm. The colorimetric assay method and titanium-based reagent are adaptable to different water types including drinking water, swimming pool water, and treated water, making the system multi-functional for various water treatment applications
3Productivity
If measurement speed is improved for quick detection, then productivity increases, but measurement precision deteriorates due to insufficient reaction time
Solution Approach 1:
The invention employs preliminary action by pre-mixing the titanium-based reagent with stabilizing agents and buffers to create a reaction mixture that immediately produces a stable, intense color upon contact with hydrogen peroxide. This pre-prepared reagent system eliminates the need for complex on-site preparation steps, enabling both rapid measurement and high precision without compromising either objective
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
The method achieves accurate measurement of hydrogen peroxide concentrations down to 0.1 ppm, unaffected by pH, temperature, or water composition, providing a reliable and precise detection system for low hydrogen peroxide levels in drinking water.
Implementation Method 1
A colorimetric assay method using a reagent compound like potassium bis(oxalato)oxotitanate (IV) DI, with a selected wavelength of 470 nm, and a reagent mixture including EDTA di-sodium salt dihydrate and polyoxyethylene (23) lauryl ether in sulfuric acid solvent, to produce a reaction product that absorbs light proportionally to hydrogen peroxide concentration
Implementation Method 2
produce a reaction product that absorbs light proportionally to hydrogen peroxide concentration
Data Source
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Figure 3
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AI summary
An apparatus and method for measuring hydrogen peroxide concentration in water to an accuracy of 0.1 ppm comprises a colorimetric assay method to determine hydrogen peroxide concentration. The assay is monitored spectophotometrically at a desired wavelength. Each sample is corrected relative to a control sample and hydrogen peroxide concentration determined with respect to a standard curve.