Soil Leaching Solution with pH Indicators for Stable Analysis
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Solution Overview
Problem
Existing leaching solutions for analyzing inorganic elements in soil face challenges in maintaining precise pH levels during preparation and storage, leading to incorrect analysis values and exposure to harmful reagents, making it difficult to distinguish pH changes visually.
Innovation Solution
A leaching solution composition is developed with specific ratios of acetic acid, lactic acid, ammonium fluoride, ammonium sulfate, sodium hydroxide, sodium acetate, ammonium hydroxide, and indicators like bromocresol green, methyl orange, phenolphthalein, and bromocresol purple to maintain stable pH and allow visual distinction of pH changes, ensuring accurate analysis and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If precise pH adjustment is performed during preparation of leaching solutions, then analysis accuracy is improved, but the pH changes over time during storage making monitoring difficult
Solution Approach 1:
The patent adds pH indicators (bromocresol green, methyl orange, phenolphthalein, or bromocresol purple) to the leaching solutions, causing them to change color when pH deviates from the target range. This visual indication system allows immediate detection of pH changes during storage and use, resolving the contradiction by making pH stability monitorable without affecting the solution's analytical function.
2Ease of manufacture
If traditional leaching solutions are used, then standard analysis procedures are followed, but exposure to harmful reagents creates safety hazards
Solution Approach 1:
The patent replaces harmful reagents (ammonia water, acetic acid) with safer alternatives (ammonium hydroxide, ammonium acetate) while maintaining the same analytical effectiveness. This substitution eliminates safety hazards and unpleasant odors while preserving the leaching solution's ability to extract phosphorus, silicon, and cations according to standard procedures.
3Manufacturing precision
If pH adjustment is performed precisely during preparation, then initial analysis accuracy is improved, but the adjusted pH changes over time requiring continuous monitoring
Solution Approach 1:
The leaching solution performs self-monitoring through the incorporated pH indicator, which automatically changes color when pH deviates from the target range. This eliminates the need for continuous manual pH monitoring and documentation, as the solution itself provides real-time feedback on its pH status through visual color changes.
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 maintains stable pH during long-term storage, allowing for accurate analysis and safe handling by visually distinguishing pH changes, preventing incorrect fertilizer prescriptions and reducing exposure to hazardous reagents.
Implementation Method 1
0.001 parts by weight of a bromocresol green indicator
Implementation Method 2
0.001 parts by weight of a methyl orange indicator
Implementation Method 3
0.001 parts by weight of a phenolphthalein indicator
Implementation Method 4
0.001 parts by weight of a bromocresol purple indicator
Data Source
AI summary
Disclosed is a leaching solution composition for extracting available phosphate in soil, the composition including 100 parts by weight of a leaching solution containing acetic acid, lactic acid, ammonium fluoride, ammonium sulfate, and sodium hydroxide, of which the weights are 110% of the weights of constituent ingredients of a leaching solution for extracting available phosphate in soil, used in the Lancaster method and 0.001 parts by weight of a bromocresol green indicator.