TOC Measurement Acid-Addition Detection via Conductivity Change
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Solution Overview
Problem
Existing total organic carbon (TOC) measurement methods fail to confirm whether an acid has been properly added to the sample, leading to potential measurement inaccuracies due to the difficulty in verifying the addition of acid.
Innovation Solution
A method and device that measure conductivity changes in the sample before and after acid addition to determine if the acid has been introduced correctly, using a conductivity cell and controller to detect the acid's introduction based on conductivity differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a very small amount of acid is added to the sample to convert IC into carbon dioxide, then the measurement process can proceed, but it becomes difficult to confirm whether the acid has been added normally
Solution Approach 1:
The patent implements feedback by measuring the conductivity of the sample before and after acid addition. The conductivity change serves as feedback information that confirms whether the acid has been successfully added to the sample, resolving the difficulty of verifying acid addition with minimal acid quantity
Solution Approach 2:
The patent uses conductivity measurement as an intermediary parameter to indirectly detect the presence and successful addition of acid. Instead of directly observing the acid addition, the system measures the electrical conductivity change caused by the acid, which serves as a reliable indicator of proper acid addition
2Reliability
If acid is added to remove IC from the sample, then TOC measurement can be performed, but POC may be lost simultaneously leading to measurement of NPOC instead
Solution Approach 1:
The patent carefully controls and optimizes the acid addition parameters (amount, concentration, addition timing) to change the reaction conditions in a way that selectively converts IC to CO2 while minimizing POC loss. By adjusting these parameters, the system achieves reliable IC removal without excessive POC degradation
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 determination of acid addition, preventing measurement errors by confirming the presence of acid in the sample, thereby enhancing the reliability of TOC measurements.
Implementation Method 1
measuring conductivity of the sample into which the acid is introduced; and detecting the introduction of the acid from the reservoir into the reaction unit on the basis of a change in the conductivity of the sample
Data Source
AI summary
Provided are a total organic carbon measurement method and a total organic carbon measurement device capable of determining whether or not an acid has been added to a sample. An acid is introduced into a reaction unit in which the sample is placed from a reservoir in which the acid is reserved (step S103). The conductivity of the sample into which the acid has been introduced is measured (step S105). The introduction of the acid from the reservoir into the reaction unit is detected on the basis of a change in the conductivity of the sample (step S107).