ASTM E1910-04

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:E1910–04
Standard Test Method for
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Agricultural pH Control Agents
This standard is issued under the fixed designation E1910; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope Terminology E1519. Part B provides a measure of the buffer
capacity of the adjuvant. This can be used to estimate the
1.1 These test methods cover determining if an adjuvant
amountofabufferthatwillberequiredtokeepaspraysolution
meets the definitions of an acidifier, a basic blend, alkalinity
at the desired pH.
agent, or buffer in Terminology E1519.
4.3 Other pH standards can be used (see Test Method E70)
1.2 The values stated in both inch-pound and SI units are to
as long as the pHs measured are not outside the range of the
be regarded separately as the standard. The values given in
standards used.
parentheses are provided for information only.
4.4 If samples of the material to be used in a particular
1.3 This standard does not purport to address all of the
application are available, the first method can be used to
safety concerns, if any, associated with its use. It is the
determine what adjuvant rate is required to obtain the desired
responsibility of the user of this standard to establish appro-
pH. The ability of an adjuvant to adjust the pH of a particular
priate safety and health practices and determine the applica-
system will depend on the initial pH before addition.
bility of regulatory limitations prior to use.
4.5 Thesecondmethodcanbeusedtodeterminetheamount
2. Referenced Documents
of an adjuvant required to change the pH of a quantity of spray
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solution to the required value (see Note 1).
2.1 ASTM Standards:
D1126 Test Method for Hardness in Water
NOTE 1—Many acidifiers and basic blends also are buffers, so the pH
D1193 Specification for Reagent Water
change does not provide a useful measure of buffer capacity.
E70 Test Method for pH of Aqueous Solutions With the
5. Apparatus
Glass Electrode
E200 Practice for Preparation, Standardization, and Storage 5.1 pH Meter, accurate to 0.01 unit.
of Standard and Reagent Solutions for Chemical Analysis 5.2 CombinationGlass/CalomelElectrode,orseparateglass
E1519 Terminology Relating to Agricultural Tank Mix and calomel electrodes or other suitable pH electrode system.
Adjuvants 5.3 Beakers, 250 mL.
5.4 Magnetic Stirrer, 120 to 1200 rpm, or equivalent.
3. Summary of Test Method
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5.5 Magnetic Stir Bar, 1 in. (2.5 cm) in length and ⁄8 in.
3.1 Test Method A measures the change in pH of a sample (0.95 cm) in diameter.
on the addition of an acidifier or a basic blend. Test Method B
5.6 Burette, 50 mL, Class A.
measures the buffer capacity of the adjuvant by titration.
6. Reagents
4. Significance and Use
6.1 Purity of Reagents—Reagent grade chemicals shall be
4.1 This test method is intended for products sold as tank
used in all tests. Unless otherwise indicated, it is intended that
mix adjuvants for use with agricultural products. all reagents shall conform to the specifications of the Commit-
4.2 Part A provides a determination of whether the pH
tee on Analytical Reagents of the American Chemical Society
modification characteristics of the adjuvant tested meet the where such specifications are available.
definition of an acidifier, alkalinity agent, or a basic blend in
6.2 Purity of Water— Unless otherwise indicated, reference
to water shall be understood to mean reagent water,Type IV, as
defined by Specification D1193 (see Note 2).
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These test methods are under the jurisdiction of ASTM Committee E35 on
Pesticides and Alternative Control Agents and are the direct responsibility of
NOTE 2—Type IV grade reagent water may be prepared by distillation,
Subcommittee E35.22 on Pesticide Formulations and Delivery Systems.
ion exchange, reverse osmosis, electrodialysis, or a combination thereof.
Current edition approved Oct 1, 2004. Published October 2004. Originally
approved in 1997. Last previous edition approved in 2000 as E1910 – 00. DOI: 6.3 Synthetic Hard Water Stock, transfer 12.14 g of anhy-
10.1520/E1910-04.
drous calcium chloride (CaCl ) and 5.55 g of magnesium
2
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
chloride hexahydrate (MgCl ·6H O) to a 1000–mLvolumetric
2 2
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
flask. Dissolve the reagents with approximately 750 mL of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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