Standard No.:	GB/T 28137-2011
English Name:	Testing method of persistent foaming for pesticides
Chinese Name:	农药持久起泡性测定方法
Chinese Classification:	G23    Basic standards and general methods for pesticides
Professional Classification:	GB    National Standard
Source Content Issued by:	AQSIQ;SAC
Issued on:	2011-12-30
Implemented on:	2012-4-15
Status:	valid
Target Language:	English
File Format:	PDF
Word Count:	4000 words
Translation Price(USD):	110.0
Delivery:	via email in 1 business day

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