Surrogate Addition Device Using Diffusion Barrier for Remote Water Monitoring
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Solution Overview
Problem
Current methods for monitoring chemicals in remote water bodies are inefficient due to the need for large liquid samples, cumbersome analytical instruments, and potential for cross-contamination and errors during sampling and transportation, especially when a uniform flow rate is required for extended periods without electrical power.
Innovation Solution
A surrogate addition device that adds a surrogate compound at a uniform transport rate to a flowing sample stream using a diffusion barrier, allowing for verification of sample collection and concentration of analytes on a solid phase extraction device without electrical power, enabling remote and accurate chemical monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a pump is used to extract water at a constant flow rate for extended sampling periods, then uniform flow rate is achieved, but electrical power is required which is not available in remote settings
Solution Approach 1:
The device uses the flowing sample stream itself to drive the surrogate compound addition through diffusion. The flow of sample water across the diffusion barrier creates a concentration gradient that naturally drives surrogate addition without requiring external power sources, pumps, or active control mechanisms.
Solution Approach 2:
The patent replaces the mechanical pump-based flow system with a passive diffusion-based system. Instead of using a mechanically-driven pump to maintain flow, the invention relies on natural diffusion processes driven by concentration gradients, eliminating the need for mechanical components requiring electrical power.
2Ease of operation
If analytical instruments are transported to remote sample sources, then on-site analysis is enabled, but the instruments are heavy and delicate making them difficult to transport
Solution Approach 1:
The invention extracts the critical function of surrogate addition from complex analytical instruments and implements it through a simple, lightweight device. By separating the surrogate addition function from the main analytical instrumentation, the system enables on-site analysis using minimal, portable equipment.
Solution Approach 2:
The surrogate addition device uses simple, inexpensive components including a diffusion barrier membrane and reservoir that can be easily manufactured and replaced. This approach replaces expensive, delicate analytical instruments with simple, disposable-like components that are easy to transport and replace in remote settings.
3Reliability
If water samples are collected and shipped from remote sites to the laboratory, then analysis can be performed, but cross-contamination and errors occur during collection, bottling, preserving, and shipping
Solution Approach 1:
The surrogate compound is added to the sample stream at the collection site before the sample leaves the remote location. This preliminary action allows verification of sample collection integrity and detection of contamination events to occur at the source, rather than discovering errors after sample transport and handling.
Solution Approach 2:
The surrogate compound serves as a feedback mechanism to monitor sample collection quality. By analyzing the surrogate compound alongside the target analyte, the system provides real-time verification that the sample was collected and transported properly, enabling detection of contamination or handling errors.
4Measurement precision
If a diffusion barrier is used to add surrogate compound at uniform rate, then accurate verification is achieved, but device complexity increases
Solution Approach 1:
The invention uses a porous diffusion barrier membrane to control surrogate compound addition. The porous structure provides uniform diffusion pathways that ensure consistent surrogate release rates without requiring complex mechanical controls, sensors, or active regulation systems.
Solution Approach 2:
The device achieves uniform surrogate addition by controlling physical parameters of the diffusion barrier (porosity, thickness, material composition) rather than using complex control systems. By optimizing these physical parameters, the system attains precise surrogate addition with minimal device complexity.
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
Ensures accurate and efficient chemical monitoring by maintaining a uniform diffusion rate of the surrogate compound, reducing the risk of errors and contamination, and facilitating easy transportation of samples for analysis, while eliminating the need for electrical power.
Implementation Method 1
The flow chamber can be configured to receive a flowing sample solution across the outer surface of the diffusion barrier and also to diffuse the surrogate compound from the surrogate reservoir to the flow chamber
Data Source
AI summary
A surrogate addition device is described that adds a surrogate compound at a uniform transport rate to a flowing sample stream. The surrogate addition device includes a surrogate reservoir, a flow chamber, and a diffusion barrier. The surrogate reservoir can be configured to contain a surrogate solution where the surrogate solution includes a surrogate compound. The flow chamber includes an inlet port and an outlet port. At least a portion of the diffusion barrier is disposed in between the surrogate reservoir and the flow chamber. The diffusion barrier may include an inner surface that forms a wall of the surrogate reservoir, and an outer surface that forms a wall of the flow chamber. The flow chamber can be configured to receive a flowing sample solution across the outer surface of the diffusion barrier and also to diffuse the surrogate compound from the surrogate reservoir to the flow chamber.