The effectiveness of pesticides in agriculture does not only depend on the strength of the active ingredient. At the same time, this active ingredient must mix well with water and remain stable during use. In this context, emulsion stability is one of the most important quality criteria, especially for EC (Emulsifiable Concentrate) formulations. One of the international methods that can be used to measure this stability in a standardized way is the CIPAC MT 36 test method.
What is CIPAC?
CIPAC (Collaborative International Pesticides Analytical Council) is an international organization that standardizes physical and chemical analysis methods for pesticides. The test methods developed by CIPAC are considered the reference for pesticide quality control worldwide.
CIPAC MT 36 is a standard test method used to evaluate whether emulsified pesticide concentrates remain stable when mixed with water.
Why is emulsion stability important?
An emulsion is a stable compound of two immiscible liquids (usually oil and water). Pesticide EC formulations form an emulsion when mixed with water.
An unstable emulsion can lead to the following problems:
- Sinking of the active ingredient to the bottom of the container
- Uneven dosage distribution during application
- Clogging of the nozzle
- Uneven coverage of the plants
- Reduction of effectiveness
- Risk of phytotoxicity
For this reason, emulsion stability is a parameter that is evaluated in terms of both product performance and user safety.
Common problems with emulsion stability
In the laboratory, the following problems often occur:
- Fast phase separation
- Lasting cream layer
- Sinking
- Non-remixable phases
These problems are usually due to the choice of the wrong emulsifier or an incompatible solvent system.
Purpose of the CIPAC MT 36 test
The main purpose of this test is to determine, after mixing emulsion-concentrated pesticides with water, whether:
- there is a homogeneous distribution
- phase separation is present
- there is a creaming
- sedimentation is present
Factors influencing emulsion stability
Emulsion stability is influenced by many parameters:
1. Type and quality of emulsifier:The right choice of emulsifier has a direct impact on stability.
2. Properties of the active ingredient:Some active ingredients are more prone to emulsion formation.
3. Type of solvent: The polarity and viscosity of the solvent are important.
4. Water hardness:Hard water can negatively affect emulsion stability.
5. Temperature:High temperatures can accelerate phase separation.
The importance of the CIPAC MT 36 test for industry
This test is an important quality control tool for pesticide manufacturers.
Main areas of application:
- Development of new formulations
- Product Quality Control
- Admission procedure
- Stress tests
- Regulatory Compliance
The agricultural authorities of many countries prescribe the results of the CIPAC test.
For more information, please contact us. info@nano-test.com.tr