Orthophosphate Sensor Arrangement with Cross-Sensitivity Correction
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Solution Overview
Problem
Current methods for determining orthophosphate content in water and wastewater are labor-intensive and lack real-time measurement capabilities, requiring complex and maintenance-heavy wet chemical analytical devices.
Innovation Solution
A method using ion-selective dihydrogen phosphate and hydrogen phosphate sensors to register measurement signals, allowing for continuous, in-situ monitoring of orthophosphate content by correcting for cross-sensitivities and calculating orthophosphate concentration through the Nikolsky-Eisenman equation, eliminating the need for maintenance-intensive devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wet chemical analytical devices are used for orthophosphate determination, then measurement precision is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The invention segments the orthophosphate measurement task into two separate ion-selective electrodes: one for measuring dihydrogen phosphate (H2PO4-) and another for measuring hydrogen phosphate (HPO42-). Each electrode is specialized for a specific ion form, simplifying the measurement mechanism while maintaining accuracy. The control unit then combines these segmented measurements to calculate total orthophosphate content, resolving the contradiction between precision and complexity.
Solution Approach 2:
The invention replaces the mechanical/chemical wet analytical system (requiring reagents, cuvettes, and manual operations) with an electrochemical sensing system using ion-selective electrodes. This substitution eliminates the need for chemical reagents and complex mechanical sample handling, significantly reducing device complexity and maintenance requirements while preserving measurement precision through electrochemical detection.
2Measurement precision
If wet chemical analytical devices are used for orthophosphate determination, then measurement precision is improved, but maintenance requirements increase
Solution Approach 1:
The invention replaces the maintenance-intensive wet chemical analytical system with a solid-state electrochemical sensing system. Ion-selective electrodes have no moving parts, require no chemical reagent storage or handling, and eliminate the need for regular calibration with standard solutions. The electrodes can be continuously operated without the maintenance cycles required by photometric systems, resolving the contradiction between precision and ease of repair.
Solution Approach 2:
The ion-selective electrodes operate autonomously without requiring external reagent addition or manual intervention. The measurement process is self-regulating, with the control unit automatically reading electrode potentials and calculating concentrations. This self-service capability eliminates the maintenance burden of reagent replacement, cuvette cleaning, and manual calibration that plagues wet chemical systems.
3Measurement precision
If laboratory analyses are used for orthophosphate determination, then measurement precision is improved, but productivity decreases
Solution Approach 1:
The invention enables continuous measurement of orthophosphate content through permanently installed ion-selective electrodes that operate without interruption. Unlike laboratory analyses that require periodic sampling and processing, the electrochemical sensors provide continuous real-time data streams, allowing for immediate process control and significantly increasing productivity while maintaining measurement precision.
Solution Approach 2:
The invention replaces the discontinuous, labor-intensive laboratory analysis process with a continuous, automated electrochemical measurement system. The substitution eliminates manual sampling, sample preparation, and analysis steps, enabling uninterrupted monitoring and dramatically improving productivity while preserving the precision needed for process control applications.
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 cost-effective, real-time monitoring of orthophosphate levels in water and wastewater treatment processes, reducing maintenance and providing accurate, continuous data for process control.
Implementation Method 1
An ion-selective electrode is a potentiometric sensor having a measuring half cell and a reference half-cell. The measuring half cell includes a measuring membrane, at which a potential arises dependent on the concentration of a certain kind of ion.
Data Source
AI summary
According to at least one aspect of the present disclosure, a method for determining orthophosphate content of a liquid, comprising: registering a first measurement signal of an ion selective dihydrogen phosphate sensor; registering a second measurement signal of an ion selective hydrogen phosphate sensor; and determining the orthophosphate content of the liquid based on the first and second measurement signals. The dihydrogen phosphate sensor can comprise an ion selective dihydrogen phosphate electrode and the hydrogen phosphate sensor an ion selective hydrogen phosphate electrode. In the step of determining the orthophosphate content of the liquid, a cross-sensitivity of the dihydrogen phosphate electrode to hydrogen phosphate present in the liquid and a cross-sensitivity of the hydrogen phosphate electrode to dihydrogen phosphate present in the liquid can be taken into consideration.