Saline Remanence Test Composition for Safe Chloride Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for measuring chloride ions on roadways, such as the Mohr, Charpentier-Volhard, Fajan, Vogel, and gravimetric methods, utilize harmful substances like chromate, thiocyanate derivatives, and mercury, posing health and environmental risks to operators, and are not suitable for direct application on road surfaces.
Innovation Solution
A composition with a specific water/alcohol ratio of 2:3, containing 1-5 mg/ml of silver nitrate and more than 2 mg/ml of 2',7'-dichlorofluorescein, along with 20-40% glycerol, is used for semi-quantitative measurement of chloride ions, allowing easy reading of results directly on the road surface without using hazardous substances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional chloride detection methods (Mohr, Charpentier-Volhard, Fajan, Vogel) are used, then chloride ion measurement can be performed, but harmful substances (chromate, thiocyanate derivatives, mercury) are introduced posing health and environmental risks
Solution Approach 1:
The patent removes harmful substances (chromate, thiocyanate, mercury) from the detection system entirely. The new composition uses only safe components: silver nitrate, 2',7'-dichlorofluorescein, alcohol, and water, eliminating the carcinogenic and toxic elements while preserving the chloride detection function through a different chemical mechanism.
Solution Approach 2:
The patent introduces 2',7'-dichlorofluorescein as an intermediary substance that mediates the detection reaction between silver ions and chloride ions. This intermediary provides a safe, visible color change mechanism (forming a red complex) that replaces the harmful indicator systems while achieving the same measurement objective.
2Measurement precision
If traditional laboratory-based titration methods are used, then precise chloride quantification is achieved, but the methods are complex and not suitable for direct road surface application
Solution Approach 1:
The patent merges the sample collection and analysis steps into a single direct application process. The composition is applied directly to the road surface, allowing the pavement itself to serve as the sample container, eliminating the need for separate sampling, filtration, and laboratory preparation steps required by traditional methods.
Solution Approach 2:
The patent uses a highly visible color change mechanism where 2',7'-dichlorofluorescein forms a red complex with silver-chloride precipitates. This intense color change provides clear visual endpoints that can be easily observed on the road surface without sophisticated instrumentation, making the process as simple as visual inspection while maintaining quantitative accuracy.
3Ease of operation
If chromate-based indicators are used in Mohr's method, then chloride titration can be performed, but the chromate salts are carcinogenic, mutagenic, and reprotoxic requiring special handling
Solution Approach 1:
The patent converts the potentially harmful silver nitrate (which can form toxic silver compounds) into a beneficial system by using it in controlled, low concentrations with safe organic indicators. The silver ions are used precisely to detect chloride while the organic dye system provides safety benefits by being non-toxic and environmentally friendly, transforming a potentially hazardous inorganic system into a safe hybrid system.
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 composition improves the quality of coloring, enabling easy and safe measurement of chloride ions on roadways, ensuring effective salinity persistence testing without exposing operators to harmful chemicals and allowing for precise determination of chloride levels for different temperature protection levels.
Implementation Method 1
The principle of this methodology is that chloride ions react with mercury(II) thiocyanate to produce minimally dissociated mercury(II) chloride
Implementation Method 2
The excess silver nitrate present is then determined by a titrated solution of ammonium sulfocyanide in the presence of ferric alum, as a color indicator. The solution then turns a reddish-orange color due to the complexation of Fe3+ ions with SCN− ions to give [Fe(SCN)]2+
Implementation Method 3
The end of the reaction is indicated by the appearance of the characteristic red color of silver chromate
Implementation Method 4
A composition for the detection of chloride ions on the surface of a pavement, notable in that it comprises a water/alcohol ratio of between 2 and 3, between 1 and 5 mg/ml of silver nitrate, and more than 2 mg/ml of 2',7'-dichlorofluorescein
Data Source
AI summary
The present invention relates to the field of pavement treatment. More particularly, the present invention relates to compositions, assemblies of parts, methods, and uses for measuring the quantity of chloride ions on the surface of a pavement. The present invention relates in particular to a composition for detecting chloride ions on the surface of a pavement, characterized in that it comprises a water/alcohol ratio of between 2 and 3, between 20 and 40% glycerol, between 1 and 5 mg/ml of silver nitrate, and more than 2 mg/ml of 2',7'-dichlorofluorescein.