Testing method of persistent foaming for pesticides
1 Scope
This standard specifies the testing method of persistent foaming for pesticides.
This standard is applicable to pesticide products that need to be diluted with water before application.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 601 Chemical reagent - Preparations of reference titration solutions
GB/T 603 Chemical reagent - Preparations of reagent solutions for use in test methods
GB/T 5451-2001 Testing method for the wettability of dispersible powders of pesticides
3 Test methods
3.1 Method summary
The specified amount of sample is mixed with standard hard water, and the foam volume is recorded after standing.
3.2 Reagents and solutions
Water: Grade 3 water;
Magnesium oxide: Dry at 105°C for at least 2h before use;
Calcium carbonate: Dry at 105°C for at least 2h before use;
Acid solution: c(HCl)=0.1 mol/L, prepared according to the requirements of GB/T 601;
Acid solution: c(HCl)=1.0 mol/L, prepared according to the requirements of GB/T 601;
Sodium hydroxide solution c(NaOH)=0.1 mol/L, prepared according to GB 601;
Foreword i
1 Scope
2 Normative references
3 Test methods
