GB/T 19137-2003 English PDF (GBT19137-2003)

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GB/T 19137-2003: Testing method for the storage stability at low temperature of pesticides
GB/T 19137-2003
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 65.100.01
G 23
Testing Method for the Storage Stability
at Low Temperature of Pesticides
ISSUED ON: MAY 20, 2003
IMPLEMENTED ON: NOVEMBER 1, 2003
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Testing Method ... 4 
Foreword
The modification of this Standard adopts CIPAC MT 39 Low Temperature Stability of
Liquid Formulations, which was issued by the Collaborative International Pesticides
Analytical Council.
In comparison with CIPAC MT 39 Low Temperature Stability of Liquid Formulations,
the main differences are as follows:
---The step of adding seed crystal to testing is deleted from this Standard;
---This Standard clarifies that the bottom educt shall receive centrifugal separation
to record the volume, while CIPAC MT 39.3 does not clarify it.
This Standard was proposed by the former State Bureau of Petroleum and Chemical
Industry.
This Standard shall be under the jurisdiction of National Technical Committee on
Pesticides of Standardization Administration of China.
The responsible drafting organization of this Standard: Institute for the Control of
Agrochemicals.
The drafters of this Standard: Jiying, Huang Xiuzhu, Wang Guolian, Zhao Yonghui.
This Standard was issued for the first time.
Testing Method for the Storage Stability
at Low Temperature of Pesticides
1 Scope
This Standard stipulates the method for the testing of low temperature stability of liquid
formulations of pesticides.
This Standard is applicable to the testing of low temperature stability of liquid
formulations of pesticides.
2 Testing Method
2.1 Emulsions and Homogeneous Liquid Formulations
2.1.1 Method summary
At 0 °C, samples shall be maintained for 1 h. Record whether there is any solid or
greasy substance being precipitated. Continue to maintain it at 0 °C; store for 7 d. Then,
conduct centrifugal separation, precipitate the solid educt. Record its volume.
2.1.2 Instruments and equipment
2.1.2.1 Refrigerator: it shall be able to maintain (0 ± 2) °C;
2.1.2.2 Conical centrifuge tube: 100 mL; division value on the bottom of the tube shall
be accurate to 0.1 mL;
2.1.2.3 Centrifuge: matched with centrifuge tube;
2.1.2.4 Pipette: 100 mL.
2.1.3 Test procedure
Transfer-take 100 mL of sample, then, place it into a centrifuge tube. In the refrigerator,
cool it down to (0 ± 2) °C. Maintain the centrifuge tube and the content at (0 ± 2) °C for
1 h. In addition, in every 15 min, stir it once. Every stirring shall last 15 s. Examine and
record whether there is any solid or greasy substance being precipitated. Put the
centrifuge tube back to the refrigerator. At (0 ± 2) °C, continue to place it for 7 d. After
7 d, take the centrifuge tube out. At room temperature (does not exceed 20 °C), place
it still for 3 h. Then, conduct centrifugal separation for 15 min (relative centrifugal force
on top of the tube is 500 g ~ 600 g; g signifies gravity acceleration). Record the volume
(accurate to 0.05 mL) of educt at the bottom of the tube.