Anionic Herbicide Formulations with Cationic Surfactant Sorbent Complexes
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Solution Overview
Problem
Auxin herbicides, such as dicamba, face issues with leaching into groundwater, reducing their residual effectiveness and causing off-site movement, which affects their herbicidal efficacy and can damage adjacent crops.
Innovation Solution
Formulations combining an anionic herbicide, a particulate sorbent like silica, and a cationic surfactant, where the cationic surfactant is bonded to the sorbent and the anionic herbicide is bonded to the surfactant, creating a stable complex that reduces leaching and off-site movement while maintaining herbicidal activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If auxin herbicide is applied to control unwanted plants, then herbicidal efficacy is improved, but leaching into groundwater occurs which reduces residual effect
Solution Approach 1:
A cationic surfactant is introduced as an intermediary substance that binds to the anionic auxin herbicide through electrostatic attraction. This surfactant-herbicide complex reduces the herbicide's mobility and leaching potential while maintaining its biological activity, thereby preserving residual effect without compromising herbicidal efficacy
Solution Approach 2:
The formulation creates a composite system consisting of the anionic herbicide, cationic surfactant, and water. The surfactant acts as a binding agent that forms a stable complex with the herbicide, creating a composite material with reduced leaching properties while maintaining herbicidal function over extended periods
2Reliability
If auxin herbicide is applied for weed control, then herbicidal activity is enhanced, but off-site movement occurs causing damage to adjacent crops
Solution Approach 1:
The cationic surfactant serves as a mediating agent that binds to the anionic herbicide, creating a larger complex with reduced mobility. This complex remains localized at the application site, preventing off-site movement to adjacent crops while maintaining the herbicide's biological activity for effective weed control
Solution Approach 2:
The harmful property of high mobility and off-site movement is effectively extracted or removed from the herbicide system by binding it to the surfactant. The resulting complex retains the desired herbicidal activity but loses the problematic mobility characteristic that causes off-site damage
3Loss of substance
If ground water dilutes the auxin herbicide, then leaching is reduced, but herbicidal efficacy is compromised
Solution Approach 1:
The cationic surfactant acts as a protective intermediary that binds to the anionic herbicide, creating a stable complex that is less susceptible to dilution by ground water. This complex maintains sufficient herbicide concentration at the target site to ensure effective weed control while reducing leaching losses
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 formulations exhibit extended residual effect and reduced off-site movement, enhancing the longevity and specificity of herbicidal action while minimizing environmental impact.
Implementation Method 1
the cationic surfactant is bonded to the particulate sorbent
Implementation Method 2
the anionic herbicide is bonded to the cationic surfactant bound to the particulate sorbent
Implementation Method 3
the formulations include an anionic herbicide, a particulate sorbent, and a cationic surfactant
Data Source
AI summary
The present invention generally relates to high residual effect and/or low off-site movement anionic herbicide formulations and, more particularly, auxin herbicide formulations. Generally, the formulations of the present invention include an anionic herbicide (e.g., an auxin herbicide), a particulate sorbent (e.g., silica), a cationic surfactant, and water.