GB/T 28137-2011 English PDF (GBT28137-2011)

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GB/T 28137-2011: Testing method of persistent foaming for pesticides
GB/T 28137-2011
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 65.100
G 23
Testing Method of Persistent Foaming for Pesticides
ISSUED ON: DECEMBER 30, 2011
IMPLEMENTED ON: APRIL 15, 2012
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Testing method ... 4 
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard uses the redrafting method to modify and use CIPAC MT 47
"Persistent foaming” of Collaborative International Pesticides Analytic Council.
The main differences between this Standard and CIPAC MT 47 "Persistent
foaming" are:
-- The difference of the use of standard hard water: this Standard specifies
the use of standard hard water D (342 mg/L). CIPAC MT 47 specifies the
use of standard hard water C (500 mg/L).
-- The difference of sampling amount: this Standard specifies a sampling
amount of 1.0 g. CIPAC MT 47 does not specify the sampling amount.
-- The difference of the way in reversing the measuring cylinder: the way in
reversing the measuring cylinder which is specified in this Standard is that
the measuring cylinder is reversed, with the middle of the cylinder as the
center, by 180° up and down for 30 times (2 s each time). CIPAC MT 47
does not indicate whether the bottom of the cylinder or the middle of the
cylinder is the center.
-- The difference of the standing time of the measuring cylinder: this Standard
specifies that the foam volume shall be recorded at 1 min ± 10 s after the
measuring cylinder is inverted up and down for 30 times; CIPAC MT 47
specifies that the foam volume shall be recorded at 10 s ± 1 s, 1 min ± 10
s, 3 min ± 10 s, 12 min ± 10 s.
This Standard was proposed by China Petroleum and Chemical Industry
Federation.
This Standard shall be under the jurisdiction of National Technical Committee
133 on Pesticides of Standardization Administration of China (SAC/TC 133).
The organizations that are responsible for the drafting of this Standard:
Zhejiang Research Institute of Chemical Industry.
The organizations that participate in the drafting of this Standard: Jiangsu
Kuaida Agrochemical Co., Ltd., Hefei Xingyu Chemical Co., Ltd.
The drafters of this Standard: Fang Lu, Sun Weiping, Feng Yujie, Li Juying, Sun
Hai, Chen Jie, Ding Yunhao.
Testing Method of Persistent Foaming for Pesticides
1 Scope
This Standard specifies the testing method of persistent foaming for pesticides.
This standard applies to pesticide products that need to be diluted with water
before application.
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For
undated references, the latest edition (including all amendments) applies to this
document.
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 Testing method
3.1 Method summary
Mix a specified amount of the sample with standard hard water; let it stand still;
then, record the foam volume.
3.2 Reagents and solutions
Water: grade-3 water;
Magnesium oxide: before use, dry it at 105°C for more than 2 h;
Calcium carbonate: before use, dry it at 105°C for more than 2 h;
Hydrochloric acid solution: c(HCl) = 0.1 mol/L, prepare according to GB/T 601;
Hydrochloric acid solution: c(HCl) = 1.0mol/L, prepare according to GB/T 601;