GB/T 28137-2011Testing method of persistent foaming for pesticides (English PDF)

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