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GB/T 19137-2003Testing method for the storage stability at low temperature of pesticides (English PDF)

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Issued by

General Administration of Quality Supervision, Inspection and Quarantine

Level / Type

National · Recommended

Issue date

May 20, 2003

Implementation date

November 1, 2003

Scope

GB/T 19137-2003 (Testing method for the storage stability at low temperature of pesticides) is available as an English-translated PDF.

GB/T 19137-2003 — 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.

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Document preview — GB/T 19137-2003

National Standard of the People's Republic of China

ICS: 65.100.01
Classification: G 23

Issued by: General Administration of Quality Supervision, Inspection and Quarantine

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.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 4 pages — is available in the English PDF.

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