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GB/T 1603-2001 (GBT1603-2001)

GB/T 1603-2001_English: PDF (GBT 1603-2001, GBT1603-2001)
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BASIC DATA
Standard ID GB/T 1603-2001 (GB/T1603-2001)
Description (Translated English) Determination method of emulsion stability for pesticide
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard G23
Classification of International Standard 65.100; 71.040.40
Word Count Estimation 3,322
Date of Issue 2001-07-13
Date of Implementation 2002-02-01
Older Standard (superseded by this standard) GB 1603-1979 (1988)
Adopted Standard WHO; NEQ; CIPAC; NEQ
Drafting Organization Ministry of Agriculture
Administrative Organization Pesticide National Standardization Technical Committee
Proposing organization National Oil and Chemical Industry Bureau Policy and Regulation Division
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China
Summary This standard applies to: pesticides EC, water emulsion and microemulsion formulations agent emulsion stability determination.

Standards related to: GB/T 1603-2001

GB/T 1603-2001
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 65.100; 71.040.40
G 23
Replacing GB 1603-1979 (1988)
Determination Method of
Emulsion Stability for Pesticide
ISSUED ON: JULY 13, 2001
IMPLEMENTED ON: FEBRUARY 01, 2002
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine
Table of Contents
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:
...