ASTM E1673-96(2006)
(Test Method)Standard Test Method for Percent Suspensibility
Standard Test Method for Percent Suspensibility
SIGNIFICANCE AND USE
This test method is designed specifically for dry formulations, but need not be restricted to these materials.
Either option of this test method (see Section 8) may be used to determine the percent suspensibility.
This test method may not be applicable to all dry formulations such as those containing either liquids or ingredients that rise to the top upon separation.
This test method may not be applicable to formulations containing ingredients that decompose under the test conditions.
This test method may not give reproducible results if flocculation occurs.
This test method should be run in duplicate.
Products containing water soluble or volatile components may result in errors.
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
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: E1673 − 96(Reapproved 2006)
Standard Test Method for
Percent Suspensibility
This standard is issued under the fixed designation E1673; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4.4 This test method may not be applicable to formulations
containing ingredients that decompose under the test condi-
1.1 This test method is used to determine the percent
tions.
suspensibility of dry pesticide formulations.
4.5 This test method may not give reproducible results if
1.2 This standard does not purport to address all of the
flocculation occurs.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4.6 This test method should be run in duplicate.
priate safety and health practices and determine the applica-
4.7 Products containing water soluble or volatile compo-
bility of regulatory limitations prior to use. For specific
nents may result in errors.
precautionary statements see Section 7.
2. Referenced Documents 5. Apparatus
2.1 ASTM Standards: 5.1 Balance, top loading, with an accuracy of 60.01g or
D1126Test Method for Hardness in Water
better.
D1193Specification for Reagent Water
5.2 Beaker, 100 mL.
3. Summary of Test Method
5.3 Mixing Cylinder, stoppered, 250 mL, flat bottom, KI-
MAX series 20039 or equivalent.
3.1 Aknownquantityofdrypesticideisslurriedinto50mL
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
filled to volume with test water. The mixing cylinder is
5.6 Stir Bar, magnetic 1 in. in length and ⁄8 in. in diameter
stoppered and inverted 15 complete cycles. The mixing cylin- (2.5 cm×1 cm).
derisallowedtostandfor30min.After30minthetop225mL
5.7 Weighing Dish,aluminum(57×18mm)orpetridish,or
isdrawnoffandtheremainingsuspensionisdried.Theresidue
equivalent.
weight will determine the percent suspensibility.
5.8 Vacuum Apparatus, see Fig. 1, equipped with a vented
4. Significance and Use
stopper to prevent the formation of a vacuum.
4.1 This test method is designed specifically for dry
5.9 Filtering Flask, heavy wall, 500 mL, KIMAX Series
formulations, but need not be restricted to these materials.
27060 or equivalent.
4.2 Either option of this test method (see Section 8) may be
5.10 Gravity Oven.
used to determine the percent suspensibility.
5.11 Centrifuge, any centrifuge capable of holding a 50 mL
4.3 This test method may not be applicable to all dry
or larger tube and maintaining a minimum speed of 1500 rpm.
formulations such as those containing either liquids or ingre-
5.12 Centrifuge Tube, plastic or glass, 50 mL or larger.
dients that rise to the top upon separation.
6. Reagents (Test Water)
This test method is under the jurisdiction of ASTM Committee E35 on
Pesticides and Alternative Control Agents and is the direct responsibility of
6.1 Purity of Reagents—Reagent grade chemicals shall be
Subcommittee E35.22 on Pesticide Formulations and Delivery Systems.
used in all tests. Unless otherwise indicated, it is intended that
Current edition approved Nov. 15, 2006. Published December 2006. Originally
approved in 1995. Last previous edition approved in 2001 as E1673–96 (2001).
DOI: 10.1520/E1673-96R06.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from Fisher Scientific, 711 Forbes Avenue, Pittsburgh, PA 15219.
Standards volume information, refer to the standard’s Document Summary page on Also available from Curtin Matheson Scientific, Inc., P.O. Box 1546, Houston, TX
the ASTM website. 77251-1546.
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E1673 − 96 (2006)
6.3.1 Soft Water—Equivalenttoatotalhardnessof34.2ppm
as calcium carbonate (CaCO ). Transfer 2.50 mL of 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 D1126 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:
DesiredWaterHardness413.6805 (1)
[millilitresofsynthetichardwaterstockat 207Ctobe
dilutedvolumetricallyto1000mLwithwaterat207C]
6.4 Other Carriers—Carriers other than water may be used
when appropriate.
7. Safety Precautions
FIG. 1 Vacuum Apparatus 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
all reagents shall conform to the specifications of the Commit-
contamination of the surrounding area. Always wear the
tee onAnalytical Reagents of theAmerican Chemical Society
appropriatesafetyequipmentand,whereindicated,wearrespi-
where such specifications are available.
ratory devices approved by the National Institute of Occupa-
6.2 Purity of Water—Unless otherwise indicated, reference tionalSafetyandHealth(NIOSH)fortheproductbeingtested.
towatershallbeunderstoodtomeanreagentwater,TypeIV,as
8. Procedure
defined by Specification D1193.
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 60.10g.
drou
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