Electrolyte Analysis Reagent Dilution for Stable ISE Measurements
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Solution Overview
Problem
Existing electrolyte analysis apparatuses using the ISE method face challenges in maintaining accurate measurements due to temperature variations, leading to errors in conversion from potential difference to electrolyte concentration, particularly when the measurement system changes temperature during startup or reagent switching, necessitating complex configurations to maintain constant temperature.
Innovation Solution
The apparatus controls reagent temperature using a simpler configuration by diluting concentrated internal standard solutions with pure water at a controlled ratio to minimize temperature differences, ensuring measurements are performed at a stable temperature close to the environment temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If constant temperature water circulation and preheating regions are used to maintain stable temperature, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The invention extracts the temperature control function from the measurement system by using a separate reagent temperature management mechanism. The reagent is temperature-controlled independently before being introduced to the measurement cell, eliminating the need for complex temperature control in the measurement system itself.
Solution Approach 2:
The reagent undergoes preliminary temperature adjustment in a reagent reservoir before being introduced to the measurement system. This preliminary action ensures the reagent is at the appropriate temperature when it reaches the measurement cell, preventing temperature-induced measurement errors without requiring the entire measurement system to be temperature-controlled.
2Stability of the object's composition
If preheating region is expanded to handle large temperature changes, then measurement stability is improved, but device complexity and space requirements increase
Solution Approach 1:
The temperature control function is segmented into separate components: a reagent reservoir with temperature control and a measurement cell without temperature control requirements. This segmentation allows temperature management to be handled in a dedicated region rather than requiring the entire measurement system to be temperature-controlled.
3Measurement precision
If dummy measurements or waiting time are used to accommodate temperature changes, then measurement accuracy is improved, but productivity decreases
Solution Approach 1:
The reagent is pre-adjusted to the appropriate temperature in the reagent reservoir before being introduced to the measurement system. This preliminary temperature adjustment eliminates the need for dummy measurements or waiting periods, allowing immediate accurate measurements and maintaining high throughput.
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 approach allows for accurate electrolyte concentration measurements without the need for extensive preheating regions or complex configurations, maintaining measurement stability and throughput.
Implementation Method 1
an ion selective electrode method (ISE method) is known in which an electrolyte concentration in a specimen is measured by measuring a potential difference between an ion selective electrode (ISE) and a reference electrode
Implementation Method 2
diluting concentrated internal standard solutions with pure water at a controlled ratio to minimize temperature differences
Data Source
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AI summary
An electrolyte analysis apparatus capable of controlling the temperature of a reagent with a simpler configuration is provided. An electrolyte analysis apparatus 100, which measures the concentration of a specific ion in a specimen based on the result of measuring a reagent having a predetermined ion concentration by an ion selective electrode 1 and the result of measuring the specimen by the ion selective electrode, includes a reagent unit 103 for diluting and restoring a concentrated internal standard solution having a concentration higher than a predetermined ion concentration with pure water to generate a reagent having the predetermined ion concentration, and a mechanism unit 104, in which the reagent generation unit generates the reagent such that the absolute value of the temperature difference between the reagent obtained by the dilution and restoration, and the pure water is smaller than the absolute value of the temperature difference between the reagent obtained by the dilution and restoration, and the reagent stock solution.