ASTM E1673-96(2001)

Standard Test Method for Percent Suspensibility

SCOPE
1.1 This test method is used to determine the percent suspensibility of dry pesticide formulations.  
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific precautionary statements see Section 7.

General Information

• Status: Historical
• Publication Date: 31-Dec-2000
• ICS: 65.100.01 - Pesticides and other agrochemicals in general
• Technical Committee: E35 - Pesticides, Antimicrobials, and Alternative Control Agents
• Drafting Committee: E35.22 - Pesticide Formulations and Delivery Systems

Relations

• Replaces: ASTM E1673-96 - Standard Test Method for Percent Suspensibility
• Effective Date: 01-Jan-2001
• Replaced By: ASTM E1673-96(2006) - Standard Test Method for Percent Suspensibility
• Effective Date: 15-Nov-2006

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:E1673–96 (Reapproved 2001)
Standard Test Method for
Percent Suspensibility
This standard is issued under the fixed designation E 1673; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4.3 This test method may not be applicable to all dry
formulations such as those containing either liquids or ingre-
1.1 This test method is used to determine the percent
dients that rise to the top upon separation.
suspensibility of dry pesticide formulations.
4.4 This test method may not be applicable to formulations
1.2 This standard does not purport to address all of the
containing ingredients that decompose under the test condi-
safety concerns, if any, associated with its use. It is the
tions.
responsibility of the user of this standard to establish appro-
4.5 This test method may not give reproducible results if
priate safety and health practices and determine the applica-
flocculation occurs.
bility of regulatory limitations prior to use. For specific
4.6 This test method should be run in duplicate.
precautionary statements see Section 7.
4.7 Products containing water soluble or volatile compo-
2. Referenced Documents
nents may result in errors.
2.1 ASTM Standards:
5. Apparatus
D 1126 Test Method for Hardness in Water
5.1 Balance, top loading, with an accuracy of 6 0.01g or
D 1193 Specification for Reagent Water
better.
3. Summary of Test Method
5.2 Beaker, 100 mL.
5.3 Mixing Cylinder, stoppered, 250 mL, flat bottom, KI-
3.1 Aknown quantity of dry pesticide is slurried into 50 mL
MAX series 20039 or equivalent.
of test water in a 100-mL beaker. The slurry is quantitatively
5.4 Timer, adjustable, with an accuracy of 6 min.
transferred to a 250-mL mixing cylinder using additional test
5.5 Magnetic Stirrer, 120 to 1200 rpm, or equivalent.
water to rinse the beaker. The 250-mL mixing cylinder is then
5.6 Stir Bar, magnetic 1 in. in length and ⁄8 in. in diameter
filled to volume with test water. The mixing cylinder is
(2.5 cm 3 1 cm).
stoppered and inverted 15 complete cycles. The mixing cylin-
5.7 Weighing Dish, aluminum (57 3 18 mm) or petri dish,
derisallowedtostandfor30min.After30minthetop225mL
or equivalent.
is drawn off and the remaining suspension is dried.The residue
5.8 Vacuum Apparatus, see Fig. 1, equipped with a vented
weight will determine the percent suspensibility.
stopper to prevent the formation of a vacuum.
4. Significance and Use
5.9 Filtering Flask, heavy wall, 500 mL, KIMAX Series
27060 or equivalent.
4.1 This test method is designed specifically for dry formu-
5.10 Gravity Oven.
lations, but need not be restricted to these materials.
5.11 Centrifuge, any centrifuge capable of holding a 50 mL
4.2 Either option of this test method (see Section 8) may be
or larger tube and maintaining a minimum speed of 1500 rpm.
used to determine the percent suspensibility.
5.12 Centrifuge Tube, plastic or glass, 50 mL or larger.
6. Reagents (Test Water)
This test method is under the jurisdiction of ASTM Committee E35 on
Pesticides and is the direct responsibility of Subcommittee E35.22 on Pesticide
6.1 Purity of Reagents—Reagent grade chemicals shall be
Formulation and Application Systems.
used in all tests. Unless otherwise indicated, it is intended that
Current edition approved Aug. 10, 1996. Published October 1996. Originally
published as E 1673 – 95. Last previous edition E 1673 – 95.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
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the ASTM website. 77251-1546.
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E1673–96 (2001)
synthetic hard water stock by pipet to a 1000-mL volumetric
flask and dilute to volume with water at 20°C. Mix solution
thoroughly.
NOTE 2—It is recommended that total hardness be checked in accor-
dance with Test Method MT-73, CIPAC 1, EDTA titration. An alternate
method is provided in Test Method D 1126 where the value is represented
as CaCO . A value within 6 % of the nominal hardness value is
acceptable.
6.3.2 Hard Water—Equivalent to a total hardness of 342
ppm as calcium carbonate (CaCO ). Transfer 25 mL of
synthetic hard water stock by buret to a 1000-mL volumetric
flaskanddilutetovolumewithwaterat20°C.Mixthissolution
thoroughly (see Note 2).
6.3.3 Extra-Hard Water—Equivalent to a total hardness of
1000 ppm as calcium carbonate (CaCO ). Transfer 73.1 mLof
synthetic hard water stock by buret to a 1000-mL volumetric
flaskanddilutetovolumewithwaterat20°C.Mixthissolution
thoroughly (see Note 2).
6.3.4 Other Test Waters—Other synthetic waters can be
prepared by using the following calculation:
Desired Water Hardness 4 13.680 5
[millilitres of synthetic hard water stock at 20°C to be
diluted volumetrically to 1000 mL with water at 20°C# (1)
6.4 Other Carriers—Carriers other than water may be used
when appropriate.
7. Safety Precautions
7.1 Before testing, read the precautionary statements on the
product label or the Material Safety Data Sheet (MSDS), or
both. Take proper precautions to prevent skin contact and
FIG. 1 Vacuum Apparatus
inhalation of the fines or vapors, or both. Take care to prevent
contamination of the surrounding area. Always wear the
all reagents shall conform to the specifications of the Commit- appropriate safety equipment and, where indicated, wear res-
tee on Analytical Reagents of the American Chemical Society piratory devices approved by the National Institute of Occu-
where such specifications are available. pational Safety and Health (NIOSH) for the product being
6.2 Purity of Water—Unless otherwise indicated, reference tested.
to water shall be understood to mean reagent water,Type IV, as
8. Procedure
defined by Specification D 1193.
8.1 Option A (Evaporation):
NOTE 1—Type IV grade reagent water may be prepared by distillation,
8.1.1 Each sample should be run in duplicate.
ion exchange, reverse osmosis, electrodialysis, or a combination thereof.
8.1.2 Weigh a 4-g sample into a weighing dish. Record the
6.3 Synthetic Hard Water Stock—Transfer 12.14 g of anhy-
sample weight (W ) to an accuracy of 6 0.10g.
drous calcium chloride (CaCl )
...