Combined pH Ammonia Sensor for Continuous Aqueous Monitoring
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Solution Overview
Problem
Current methods for measuring total ammonia in aqueous environments are inaccurate due to non-homogeneous sampling, spatial, temporal, and thermal discontinuities, and lack the ability for continuous, quantitative determination of pH and ammonia levels, which is crucial for assessing toxic risks in aquatic systems.
Innovation Solution
A combination pH and ammonia measuring device that allows for simultaneous, continuous measurement of solution pH and ammonia using submersible sensors with non-dissociating detection means, providing a visual indicator for standardized quantitative determination, and utilizing porous matrix polytetrafluoroethylene (PTFE) with immobilized dyes for enhanced sensitivity, capable of detecting ammonia in the range of 0.005 to 0.1 ppm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If single-point measurements are used for total ammonia and pH, then the measurement procedure is simple and quick, but the measurement accuracy is poor due to non-homogeneous sampling and spatial, temporal, and thermal discontinuities
Solution Approach 1:
The patent combines pH and ammonia sensing capabilities into a single integrated device. The sensing element contains both pH-sensitive and ammonia-sensitive indicator portions that can simultaneously measure both parameters in the same solution sample, eliminating the need for separate measurement procedures and reducing sampling discontinuities.
Solution Approach 2:
The sensing element is designed to perform multiple functions: measuring both pH and ammonia concentration, providing visual indicators for both parameters, and enabling continuous monitoring. This multi-functional design addresses the technical contradiction by providing accurate measurements without requiring multiple separate devices or procedures.
2Measurement precision
If visual tests with reagents are used for total ammonia measurement, then the test can be performed with simple equipment, but the measurement is indirect and cannot provide continuous quantitative data
Solution Approach 1:
The patent uses color-changing indicator portions that provide visual indicators for both pH and ammonia concentration. The pH indicator portion changes color based on pH level, while the ammonia indicator portion changes color based on ammonia concentration, enabling direct visual measurement without complex reagent additions or equipment.
Solution Approach 2:
The sensing element is designed to be self-contained with immobilized indicators that automatically respond to the solution conditions. The device performs the measurement function itself without requiring external reagents to be added or complex operational procedures, maintaining simplicity while improving measurement quality.
3Duration of action of stationary object
If single-use test strips are immersed in solution for instantaneous measurement, then the device is simple and disposable, but it cannot provide continuous measurement or reversibility with prolonged immersion
Solution Approach 1:
The patent employs porous polymer matrices to immobilize the indicator dyes. The porous structure allows the indicators to remain stable and functional during prolonged immersion while maintaining their sensing capability. The porous matrix prevents leaching and degradation, enabling continuous measurement over extended periods.
Solution Approach 2:
The sensing element uses composite materials combining porous polymers with immobilized indicator dyes. This composite structure provides both the mechanical stability needed for prolonged immersion and the chemical functionality required for continuous sensing, resolving the contradiction between durability and continuous operation.
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 solution provides accurate, continuous, and quantitative measurements of total ammonia, overcoming previous inaccuracies and enabling early detection of potential toxic conditions in both aqueous and air environments, with enhanced sensitivity and stability over extended periods.
Implementation Method 1
A combination pH and ammonia measuring device that allows for simultaneous, continuous measurement of solution pH and ammonia using submersible sensors with non-dissociating detection means, providing a visual indicator for standardized quantitative determination
Implementation Method 2
utilizing porous matrix polytetrafluoroethylene (PTFE) with immobilized dyes for enhanced sensitivity
Implementation Method 3
submersible ammonia-sensing portion attached to the submersible member, the ammonia-sensing portion having non-dissociating detection means suitable to provide for a continuous visual indicator of solution ammonia concentration
Data Source
AI summary
Particular aspects provide novel devices and methods for accurately measuring total ammonia (NH3 plus NH4+) in a solution (e.g., freshwater and saltwater) by spatially proximate, simultaneous and continuous quantitative measurement of solution pH and ammonia. The devices overcome prior art inaccuracies relating to non-homogeneous sampling, and to spatial, temporal and thermal sampling discontinuities. Particular embodiments provide a combination pH and ammonia measuring device, comprising: a submersible member; a submersible non-bleeding ammonia-sensing portion attached to the submersible member and suitable to provide for a continuous visual indicator of solution ammonia concentration; a submersible non-bleeding pH-sensing portion attached to the submersible member and suitable to provide for a continuous visual indicator of solution pH; visual ammonia and pH indicator comparison means suitable for comparative quantitative determination of solution ammonia concentration and pH. Additional aspects provide novel ultra-sensitive devices and methods using same for measuring ammonia in air or solution.