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GB/T 1603-2001Determination method of emulsion stability for pesticide (English PDF)

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Issued by

General Administration of Quality Supervision, Inspection and Quarantine

Level / Type

National · Recommended

Issue date

July 13, 2001

Implementation date

February 1, 2002

Scope

GB/T 1603-2001 (Determination method of emulsion stability for pesticide) is available as an English-translated PDF.

GB/T 1603-2001 — This Standard is applicable to the determination of stability for pesticide emulsifiable concentrate, water emulsion, microemulsion, and the other reagent emulsion.

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Document preview — GB/T 1603-2001

National Standard of the People's Republic of China

ICS: 65.100; 71.040.40
Classification: G 23

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

Foreword...3
1 Scope...5
2 Inspection Method...5

Foreword

This Standard was formulated by reference of Determination Method of Emulsion

Stability for Pesticide of WHO and CIPAC, and revision basing on GB/T 1603-1979

(1988) Determination Method of Emulsion Stability for Pesticide.

The major technical differences between this Standard and the method of WHO and

CIPAC are as follows:

1 Sampling quantity is different: both WHO and CIPAC specifies to pipet 5mL of

specimen; dilute by 20 times. This Standard takes into account the actual

situation in China. Most products are customarily diluted by 200 times. This

Concentration is closer to the use concentration, so the provision of pre-revision

standard is still retained; the sampling amount is not specified.

2 Judgment criteria is different: WHO specifies that oil slick, floating paste and

sediment shall be observed after standard for 2h; the specific different products

are generally specified to be no more than 2mL. CIPAC specifies that the

amounts of oil slick, floating paste and sediment shall be observed at 0.5h, 2h

and 24h. FAO adopts the CIPAC method, specifying the maximum amounts of

oil slick, floating paste and sediment for specific products. This Standard

specifies that if the emulsion does not have oil slick, floating paste and sediment

after 1h, then the emulsion stability of the product is qualified.

The major technical differences between this Standard and GB/T 1603-1979(1988) are

as follows:

1 Expand the use scope of the method; incorporate the water emulsions and

microemulsions into the use scope of this Standard.

2 Revise the determination temperature from 25°C~30°C to 30°C±2°C.

3 Revise the pipette used for pipetting sample from 5mL to the pipette with a scale

of 0.02mL.

4 For the standard hard water used for test, basing on reserving the preparation

method stipulated in the original standard, add the preparation method of hard

used in the CIPAC method.

This Standard replaced GB/T 1603-1979 (1988) Determination Method of Emulsion

Stability for Pesticide since the date of implementation.

This Standard was proposed by National Petroleum and Chemical Industry Bureau

Policy and Regulation Division.

Determination Method of

Emulsion Stability for Pesticide

1 Scope

This Standard is applicable to the determination of stability for pesticide emulsifiable

concentrate, water emulsion, microemulsion, and the other reagent emulsion.

2 Inspection Method

2.1 Method summary

Use standard hard water to dilute the specimen, observe the stability of emulsion after

1h.

2.2 Reagents and solutions

Anhydrous calcium chloride;

Calcium carbonate: bake at 400°C for 2h before use;

Magnesium chloride six crystal water: bake at 200°C for 2h before use;

Hydrochloric acid;

Standard hard water: hardness is 0.342 g/L in terms of calcium carbonate. The

preparation method is as follows:

Method I: take 0.304g of anhydrous calcium chloride and 0.139g of magnesium

chloride with crystal water into 1000mL volumetric flask; use distilled water to dissolve

and dilute to the scale.

Method II: take 2.740g of calcium carbonate and 0.276g of magnesium oxide; use a

small amount of 2mol/L hydrochloric acid to dissolve; evaporate to dryness on a water

batch to remove excessive hydrochloric acid. Then use the distilled water to completely

transfer the residue into a 100mL volumetric flask; use distilled water to dilute to the

scale; then take 10mL of such solution into 1000mL volumetric flask; use distilled water

to dilute to the scale.

Method III:

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 5 pages — is available in the English PDF.

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