Test Kit for Total Organic Carbon Analysis in Particle Polluted Samples
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Solution Overview
Problem
Current methods for determining organically bound carbon in samples contaminated with particles face challenges such as incomplete removal of inorganic carbon, loss of organic carbon, incomplete oxidation, and precipitation of humic acids, leading to inconsistent results and potential masking of carbonates.
Innovation Solution
A test kit using a pH between 2.7 and 3.3 with high buffering capacity, featuring acidic buffers like phosphoric acid and its salts, and oxidizing agents like peroxodisulfate and periodic acid, which allows for simultaneous expulsion and oxidation of inorganic and organic carbon to carbon dioxide without precipitating humic acids, ensuring quantitative measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If strong acidification is used to remove inorganic carbon, then inorganic carbon removal is improved, but organic carbon loss increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the pH value within a narrow range of 2.7-3.3, which is sufficiently acidic to convert inorganic carbon to CO2 for expulsion but not so acidic as to cause significant organic carbon loss. This optimized pH parameter resolves the contradiction between complete inorganic carbon removal and organic carbon preservation.
2Measurement precision
If pH is set very low to expel inorganic carbon, then inorganic carbon removal is improved, but humic acid precipitation occurs
Solution Approach 1:
The patent resolves this contradiction by establishing an optimized pH range of 2.7-3.3 that maintains sufficient acidity for inorganic carbon expulsion while preventing humic acid precipitation. This parameter optimization ensures that carbonates are effectively converted to CO2 without causing harmful precipitates that would mask carbonates or interfere with the analysis.
3Ease of manufacture
If wet-chemical oxidation is used to determine organic carbon, then the method is simpler, but oxidation completeness is insufficient
Solution Approach 1:
The patent employs strong oxidants including peroxodisulfate, periodic acid, and permanganic acid to achieve complete oxidation of organic carbon. These powerful oxidizing agents ensure that all organic carbon is converted to CO2, resolving the contradiction between method simplicity and oxidation completeness by providing robust oxidation capability within the optimized pH framework.
4Measurement precision
If catalytic high-temperature combustion is used for oxidation, then oxidation completeness is improved, but device complexity increases
Solution Approach 1:
The patent resolves this contradiction by using strong chemical oxidants (peroxodisulfate, periodic acid, permanganic acid) that can achieve complete oxidation at lower temperatures and simpler conditions compared to catalytic combustion. This approach maintains oxidation completeness while avoiding the complexity of high-temperature combustion systems, catalysts, and associated equipment.
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
The solution effectively removes inorganic carbon, oxidizes organic carbon to carbon dioxide, and prevents humic acid precipitation, providing accurate and consistent measurements of total organic carbon content.
Implementation Method 1
the organically bound carbon is converted into gaseous carbon dioxide in the reaction area
Implementation Method 2
Acidification usually converts the carbonates and bicarbonates into carbon dioxide
Implementation Method 3
the inorganic carbon compounds being acidified and then expelled can be removed
Implementation Method 4
indicators are present in this detection area, which undergo a color change as a result of the influence of the carbon dioxide
Data Source
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AI summary
The reagent in aqueous solution has a power of hydrogen (pH) value of more than 2 and highest 3.5. The mixture has different oxidizing agents comprising sulfuric acid peroxide, periodic acid, permanganic acid, which contains their salt or combinations of the acid or their salts. The reagent has phosphoric acid and phosphoric acid salts. An independent claim is also included for a method for determination of carbon.