Multiparameter Water Quality Calibration Solution
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Solution Overview
Problem
Current water quality sensor calibration methods, particularly for fluorescence-based sensors, face challenges with the use of quinine sulfate as a standard due to its impracticality and safety hazards in field applications, requiring a stable and environmentally safe alternative for accurate calibration across multiple sensors.
Innovation Solution
A multiparameter standard solution comprising a xanthene dye, distyryl biphenyl (DSBP), and an aqueous pH buffer, which provides a stable and safe calibration for fDOM, chlorophyll-a, and pH sensors, allowing for simultaneous verification and calibration of multiple sensors while being resistant to temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If quinine sulfate is used as a calibration standard for fluorescence-based sensors, then measurement precision is improved, but safety hazards and environmental harm increase
Solution Approach 1:
The patent replaces the hazardous quinine sulfate standard with a disposable, biodegradable organic matter standard solution that can be safely disposed of in the environment after use, eliminating the need for hazardous waste disposal while maintaining calibration functionality
Solution Approach 2:
The patent converts the previously harmful quinine sulfate standard into a beneficial, environmentally safe alternative by using natural organic matter that benefits water quality monitoring while eliminating safety hazards and environmental harm associated with the original standard
2Measurement precision
If quinine sulfate is used as a calibration standard, then measurement precision is improved, but ease of operation deteriorates due to preparation difficulties
Solution Approach 1:
The patent provides a pre-prepared, stable organic matter standard solution that requires no complex preparation steps, unlike quinine sulfate which requires careful handling of concentrated sulfuric acid and precise dilution procedures
Solution Approach 2:
The standard solution is designed to be self-contained and stable, requiring no special preparation or handling by the user, and can be directly used for calibration without additional steps
3Measurement precision
If multiple sensor types are calibrated separately, then measurement precision for each sensor is improved, but productivity deteriorates due to time consumption
Solution Approach 1:
The patent creates a universal standard solution containing multiple types of organic matter that can simultaneously calibrate multiple different sensor types (fluorescence-based sensors, absorption-based sensors, and other water quality sensors) with a single solution, eliminating the need for separate calibration standards for each sensor
Solution Approach 2:
The patent combines multiple calibration standards into a single multiparameter solution that contains different organic matter components suitable for calibrating various sensor types, merging what were previously separate calibration processes into one efficient operation
4Measurement precision
If quinine sulfate is used as a calibration standard, then measurement precision is improved, but stability deteriorates due to quick degradation
Solution Approach 1:
The patent uses stable organic matter compounds that maintain their calibration properties over extended periods, eliminating the degradation issues associated with quinine sulfate while remaining environmentally disposable after use
Solution Approach 2:
The patent changes the chemical composition parameters of the calibration standard from quinine sulfate to stable organic matter compounds, fundamentally altering the stability characteristic while maintaining calibration functionality
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 solution offers a stable calibration for at least 90 days, is environmentally safe, and can be safely disposed of, enabling efficient and accurate calibration of water quality sensors in field conditions, reducing the need for frequent preparation and handling of hazardous materials.
Implementation Method 1
On the forefront of emerging water-quality sensor technologies are fluorescence-based optical sensors, designed specifically to measure the fluorescent component of dissolved organic matter (DOM) when exposed to near-ultraviolet light
Data Source
AI summary
A multiparameter standard solution for verifying and calibrating water quality sensors containing an aqueous pH buffer, a xanthene dye, and distyryl biphenyl (DSBP) is provided. The standard solution provides a safe, quick, easy, and stable field standard to simultaneously conduct calibration analysis for several sensors at once. The standard solution is stable when stored and can be safely disposed of in the field. Methods of calibrating sensors used in water quality analysis using the multiparameter standard solution are also provided.