ASTM E1673-96

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
• Technical Committee: E35 - Pesticides, Antimicrobials, and Alternative Control Agents
• Drafting Committee: E35.22 - Pesticide Formulations and Delivery Systems

Relations

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

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: E 1673 – 96
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 4.6 This test method should be run in duplicate.
4.7 Products containing water soluble or volatile compo-
1.1 This test method is used to determine the percent
nents may result in errors.
suspensibility of dry pesticide formulations.
1.2 This standard does not purport to address all of the
5. Apparatus
safety concerns, if any, associated with its use. It is the
5.1 Balance, top loading, with an accuracy of 6 0.01g or
responsibility of the user of this standard to establish appro-
better.
priate safety and health practices and determine the applica-
5.2 Beaker, 100 mL.
bility of regulatory limitations prior to use. For specific
5.3 Mixing Cylinder, stoppered, 250 mL, flat bottom, KI-
precautionary statements see Section 7.
MAX series 20039 or equivalent.
2. Referenced Documents 5.4 Timer, adjustable, with an accuracy of 6 min.
5.5 Magnetic Stirrer, 120 to 1200 rpm, or equivalent.
2.1 ASTM Standards:
2 5.6 Stir Bar, magnetic 1 in. in length and ⁄8 in. in diameter
D 1126 Test Method for Hardness in Water
(2.5 cm 3 1 cm).
D 1193 Specification for Reagent Water
5.7 Weighing Dish, aluminum (57 3 18 mm) or petri dish,
3. Summary of Test Method
or equivalent.
5.8 Vacuum Apparatus, see Fig. 1, equipped with a vented
3.1 A known quantity of dry pesticide is slurried into 50 mL
stopper to prevent the formation of a vacuum.
of test water in a 100-mL beaker. The slurry is quantitatively
5.9 Filtering Flask, heavy wall, 500 mL, KIMAX Series
transferred to a 250-mL mixing cylinder using additional test
27060 or equivalent.
water to rinse the beaker. The 250-mL mixing cylinder is then
5.10 Gravity Oven.
filled to volume with test water. The mixing cylinder is
5.11 Centrifuge, any centrifuge capable of holding a 50 mL
stoppered and inverted 15 complete cycles. The mixing cylin-
or larger tube and maintaining a minimum speed of 1500 rpm.
der is allowed to stand for 30 min. After 30 min the top 225 mL
5.12 Centrifuge Tube, plastic or glass, 50 mL or larger.
is drawn off and the remaining suspension is dried. The residue
weight will determine the percent suspensibility.
6. Reagents (Test Water)
4. Significance and Use
6.1 Purity of Reagents—Reagent grade chemicals shall be
used in all tests. Unless otherwise indicated, it is intended that
4.1 This test method is designed specifically for dry formu-
all reagents shall conform to the specifications of the Commit-
lations, but need not be restricted to these materials.
tee on Analytical Reagents of the American Chemical Society
4.2 Either option of this test method (see Section 8) may be
where such specifications are available.
used to determine the percent suspensibility.
6.2 Purity of Water—Unless otherwise indicated, reference
4.3 This test method may not be applicable to all dry
to water shall be understood to mean reagent water, Type IV, as
formulations such as those containing either liquids or ingre-
defined by Specification D 1193.
dients that rise to the top upon separation.
4.4 This test method may not be applicable to formulations
NOTE 1—Type IV grade reagent water may be prepared by distillation,
containing ingredients that decompose under the test condi-
ion exchange, reverse osmosis, electrodialysis, or a combination thereof.
tions.
4.5 This test method may not give reproducible results if
flocculation occurs.
Available from Fisher Scientific, 711 Forbes Avenue, Pittsburgh, PA 15219.
Also available from Curtin Matheson Scientific, Inc., P.O. Box 1546, Houston, TX
77251-1546.
1 4
This test method is under the jurisdiction of ASTM Committee E-35 on Reagent Chemicals, American Chemical Society Specifications, American
Pesticides and is the direct responsibility of Subcommittee E35.22 on Pesticide Chemical Society, Washington, DC. For suggestions on the testing of reagents not
Formulation and Application Systems. listed by the American Chemical Society, see Analar Standards for Laboratory
Current edition approved Aug. 10, 1996. Published October 1996. Originally Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
published as E 1673 – 95. Last previous edition E 1673 – 95. and National Formulary, U.S. Pharmaceutical Convention, Inc. (USPC), Rockville,
Annual Book of ASTM Standards, Vol 11.01. MD.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
E 1673
synthetic hard water stock by buret to a 1000-mL volumetric
flask and dilute to volume with water at 20°C. Mix this solution
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 mL of
synthetic hard water stock by buret to a 1000-mL volumetric
flask and dilute to volume with water at 20°C. Mix this solution
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
inhalation of the fines or vapors, or both. Take care to prevent
contamination of the surrounding area. Always wear the
appropriate safety equipment and, where indicated, wear res-
piratory devices approved by the National Institute of Occu-
pational Safety and Health (NIOSH) for the product being
tested.
8. Procedure
8.1 Option A (Evaporation):
8.1.1 Each sample should be run in duplicate.
FIG. 1 Vacuum Apparatus 8.1.2 Weigh a 4-g sample into a weighing dish. Record the
sample weight (W ) to an accuracy of 6 0.10g.
8.1.3 Transfer the sample into a 100-mL beaker containing
6.3 Synthetic Hard Water Stock—Transfer 12.14 g of anhy-
50 mL of test water and stir with a magnetic stirrer at high
drous calcium chloride (CaCl ) and 5.55 g of magnesium
speed for two min.
chloride hexahydrate (MgCl ·6H O) to a 1000-mL volumetric
2 2
8.1.4 Quantitatively transfer the slurry from 8.1.3
...