ASTM E1910-00

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Designation: E 1910 – 00
Standard Test Method for
Agricultural Acidifiers and Basic Blends
This standard is issued under the fixed designation E 1910; 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 definition of an acidifier or a basic blend in Terminology
E 1519. Part B provides a measure of the buffer capacity of the
1.1 These test methods cover determining if an adjuvant
adjuvant.
meets the definitions of an acidifier or a basic blend in
4.3 Other pH standards can be used (see Test Method E 70)
Terminology E 1519.
as long as the pHs measured are not outside the range of the
1.2 The values stated in both inch-pound and SI units are to
standards used.
be regarded separately as the standard. The values given in
4.4 If samples of the material to be used in a particular
parentheses are provided for information only.
application are available, the first method can be used to
1.3 This standard does not purport to address all of the
determine what adjuvant rate is required to obtain the desired
safety concerns, if any, associated with its use. It is the
pH. The ability of an adjuvant to adjust the pH of a particular
responsibility of the user of this standard to establish appro-
system will depend on the initial pH before addition.
priate safety and health practices and determine the applica-
4.5 The second method can be used to determine the amount
bility of regulatory limitations prior to use.
of an adjuvant required to change the pH of a quantity of spray
2. Referenced Documents solution to the required value (see Note 1).
2.1 ASTM Standards:
NOTE 1—Many acidifiers and basic blends also are buffers, so the pH
D 1126 Test Method for Hardness in Water
change does not provide a useful measure of buffer capacity.
D 1193 Specification for Reagent Water
5. Apparatus
E 70 Test Method for pH of Aqueous Solutions With the
Glass Electrode 5.1 pH Meter, accurate to 0.01 unit.
E 200 Practice for the Preparation, Standardization, and 5.2 Combination Glass/Calomel Electrode, or separate glass
Storage of Standard and Reagent Solutions for Chemical and calomel electrodes or other suitable pH electrode system.
Analysis 5.3 Beakers, 250 mL.
E 1519 Terminology Relating to Agricultural Tank Mix 5.4 Magnetic Stirrer, 120 to 1200 rpm, or equivalent.
Adjuvants 5.5 Magnetic Stir Bar, 1 in. (2.5 cm) in length and ⁄8in.
(0.95 cm) in diameter.
3. Summary of Test Method
5.6 Burette, 50 mL, Class A.
3.1 Test Method A measures the change in pH of a sample
6. Reagents
on the addition of an acidifier or a basic blend. Test Method B
measures the buffer capacity of the adjuvant by titration. 6.1 Purity of Reagents—Reagent grade chemicals shall be
used in all tests. Unless otherwise indicated, it is intended that
4. Significance and Use
all reagents shall conform to the specifications of the Commit-
4.1 This test method is intended for products sold as tank
tee on Analytical Reagents of the American Chemical Society
mix adjuvants for use with agricultural products. where such specifications are available.
4.2 Part A provides a determination of whether the pH
6.2 Purity of Water— Unless otherwise indicated, reference
modification characteristics of the adjuvant tested meet the to water shall be understood to mean reagent water, Type IV, as
defined by Specification D 1193 (see Note 2).
These test methods are under the jurisdiction of ASTM Committee E35 on NOTE 2—Type IV grade reagent water may be prepared by distillation,
Pesticides and are the direct responsibility of Subcommittee E35.22 on Pesticide
ion exchange, reverse osmosis, electrodialysis, or a combination thereof.
Formulation and Application Systems.
6.3 Synthetic Hard Water Stock, transfer 12.14 g of anhy-
Current edition approved Oct. 10, 2000. Published January 2001. Originally
published as E 1910 – 97. Last previous edition E 1910 – 97.
drous calcium chloride (CaCl ) and 5.55 g of magnesium
Annual Book of ASTM Standards, Vol 11.01.
chloride hexahydrate (MgCl ·6H O) to a 1000–mL volumetric
3 2 2
Annual Book of ASTM Standards, Vol 15.05.
4 flask. Dissolve the reagents with approximately 750 mL of
Annual Book of ASTM Standards, Vol 11.05.
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E 1910
water and equilibrate to 20°C. Dilute the solution to 1000 mL 7.5 Record the new pH value.
total volume with water at 20°C, stopper the flask and mix the 7.6 Remove the electrodes from the solution, clean them,
solution thoroughly. This mixture has a hardness equivalent to and store them properly. Dispose of the solution properly.
13680 ppm of calcium carbonate (CaCO ) and is based on a
8. Report
compositional ratio of 4:1 calcium to magnesium.
6.4 Standard Hard Water, equivalent to a total hardness of
8.1 Report the initial and final pH values (see Note 6).
342 ppm of calcium carbonate (CaCO ). Transfer 25 mL of
NOTE 6—For an acidifier the final pH should be lower than the initial.
synthetic hard water stock by pipette to a 1000 mL volumetric
For a basic blend it should be higher.
flask and dilute to volume with water at 20°C. Mix the solution
thoroughly (see Note 3). 9. Precision and Bias
9.1 The precision and bias of this test method has not been
NOTE 3—It is recommended that the total hardness be checked in
accordance with Test Method MT-73, CIPAC 1, EDTA titration. An determined.
alternate method is provided in Test Method D 1126, where the value is
represented as CaCO . A value within 6 5 % of the
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