ASTM E1910/E1910M-04(2009)
(Test Method)Test Method for Agricultural pH Control Agents
Test Method for Agricultural pH Control Agents
SIGNIFICANCE AND USE
This test method is intended for products sold as tank mix adjuvants for use with agricultural products.
Part A provides a determination of whether the pH modification characteristics of the adjuvant tested meet the definition of an acidifier, alkalinity agent, or a basic blend in Terminology E1519. Part B provides a measure of the buffer capacity of the adjuvant. This can be used to estimate the amount of a buffer that will be required to keep a spray solution at the desired pH.
Other pH standards can be used (see Test Method E70) as long as the pHs measured are not outside the range of the standards used.
If samples of the material to be used in a particular application are available, the first method can be used to determine what adjuvant rate is required to obtain the desired pH. The ability of an adjuvant to adjust the pH of a particular system will depend on the initial pH before addition.
The second method can be used to determine the amount of an adjuvant required to change the pH of a quantity of spray solution to the required value (see Note 1).
Note 1—Many acidifiers and basic blends also are buffers, so the pH change does not provide a useful measure of buffer capacity.
SCOPE
1.1 These test methods cover determining if an adjuvant meets the definitions of an acidifier, a basic blend, alkalinity agent, or buffer in Terminology E1519.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.
1.3 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.
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Designation: E1910/E1910M − 04(Reapproved 2009)
Standard Test Method for
Agricultural pH Control Agents
ThisstandardisissuedunderthefixeddesignationE1910/E1910M;thenumberimmediatelyfollowingthedesignationindicatestheyear
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 4.2 Part A provides a determination of whether the pH
modification characteristics of the adjuvant tested meet the
1.1 These test methods cover determining if an adjuvant
definition of an acidifier, alkalinity agent, or a basic blend in
meets the definitions of an acidifier, a basic blend, alkalinity
Terminology E1519. Part B provides a measure of the buffer
agent, or buffer in Terminology E1519.
capacity of the adjuvant. This can be used to estimate the
1.2 The values stated in either SI units or inch-pound units
amountofabufferthatwillberequiredtokeepaspraysolution
are to be regarded separately as standard. The values stated in
at the desired pH.
each system may not be exact equivalents; therefore, each
4.3 Other pH standards can be used (see Test Method E70)
system shall be used independently of the other. Combining
as long as the pHs measured are not outside the range of the
values from the two systems may result in non-conformance
standards used.
with the standard.
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
2.1 ASTM Standards:
solution to the required value (see Note 1).
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
Glass Electrode
5. Apparatus
E200 Practice for Preparation, Standardization, and Storage
of Standard and Reagent Solutions for ChemicalAnalysis
5.1 pH Meter, accurate to 0.01 unit.
E1519 Terminology Relating to Agricultural Tank Mix Ad-
5.2 CombinationGlass/CalomelElectrode,orseparateglass
juvants
and calomel electrodes or other suitable pH electrode system.
3. Summary of Test Method
5.3 Beakers, 250 mL.
3.1 Test Method A measures the change in pH of a sample
5.4 Magnetic Stirrer, 120 to 1200 rpm, or equivalent.
on the addition of an acidifier or a basic blend. Test Method B
5.5 Magnetic Stir Bar, 1 in. (2.5 cm) in length and ⁄8 in.
measures the buffer capacity of the adjuvant by titration.
(0.95 cm) in diameter.
4. Significance and Use
5.6 Burette, 50 mL, Class A.
4.1 This test method is intended for products sold as tank
mix adjuvants for use with agricultural products.
6. Reagents
6.1 Purity of Reagents—Reagent grade chemicals shall be
These test methods are under the jurisdiction of ASTM Committee E35 on
used in all tests. Unless otherwise indicated, it is intended that
Pesticides and Alternative Control Agentsand are the direct responsibility of
Subcommittee E35.22 on Pesticide Formulations and Delivery Systems.
all reagents shall conform to the specifications of the Commit-
Current edition approved Oct. 1, 2009. Published November 2009. Originally
tee on Analytical Reagents of the American Chemical Society
approved in 1997. Last previous edition approved in 2004 as E1910 – 04. DOI:
where such specifications are available.
10.1520/E1910-04R09.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.2 Purity of Water— Unless otherwise indicated, reference
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
to water shall be understood to mean reagent water,Type IV, as
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. defined by Specification D1193 (see Note 2).
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
E1910/E1910M − 04 (2009)
NOTE 2—Type IV grade reagent water may be prepared by distillation,
them in the water and measure and record the pH, which
ion exchange, reverse osmosis, electrodialysis, or a combination thereof.
should be between 5.5 and 7.
6.3 Synthetic Hard Water Stock, transfer 12.14 g of anhy-
NOTE 5—Other water samples can be used if appropriate. In this case
drous calcium chloride (CaCl ) and 5.55 g of magnesium
the initial pH may not be between 5.5 and 7. For specific applications the
chloride hexahydrate (MgCl ·6H O) to a 1000–mL volumetric
2 2 actual water to be used is preferred.
flask. Dissolve the reagents with approximately 750 mL of
7.4 Add 2 mL of the adjuvant to be tested to the beaker and
water and equilibrate to 20°C. Dilute the solution to 1000 mL
allow to stir for 5 min. Other dilutions may be used if specified
total volume with water at 20°C, stopper the flask and mix the
on the product label.
solution thoroughly. This mixture has a hardness equivalent to
7.5 Record the new pH value.
13680 ppm of calcium carbonate (CaCO ) and is based on a
compositional ratio of 4:1 calcium to magnesium.
7.6 Remove the electrodes from the solution, clean them,
and store them properly. Dispose of the solution properly.
6.4 Standard Hard Water, equivalent to a total hardness of
342 ppm of calcium carbonate (CaCO ). Transfer 25 mL of
8. Report
synthetic hard water stock by pipette to a 1000 mL volumetric
flask and dilute to volume with water at 20°C. Mix the solution
8.1 Report the initial and final pH values (see Note 6).
thoroughly (see N
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:E1910–04 Designation: E1910/E1910M – 04 (Reapproved 2009)
Standard Test Method for
Agricultural pH Control Agents
ThisstandardisissuedunderthefixeddesignationE1910/E1910M;thenumberimmediatelyfollowingthedesignationindicatestheyear
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
1.1 These test methods cover determining if an adjuvant meets the definitions of an acidifier, a basic blend, alkalinity agent, or
buffer in Terminology E1519.
1.2The values stated in both inch-pound and SI units are to be regarded separately as the standard. The values given in
parentheses are provided for information only.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the standard.
1.3 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.
2. Referenced Documents
2.1 ASTM Standards:
D1126 Test Method for Hardness in Water
D1193 Specification for Reagent Water
E70 Test Method for pH of Aqueous Solutions With the Glass Electrode
E200 Practice for Preparation, Standardization, and Storage of Standard and Reagent Solutions for Chemical Analysis
E1519 Terminology Relating to Agricultural Tank Mix Adjuvants
3. Summary of Test Method
3.1 Test Method A measures the change in pH of a sample on the addition of an acidifier or a basic blend. Test Method B
measures the buffer capacity of the adjuvant by titration.
4. Significance and Use
4.1 This test method is intended for products sold as tank mix adjuvants for use with agricultural products.
4.2 PartAprovides a determination of whether the pH modification characteristics of the adjuvant tested meet the definition of
an acidifier, alkalinity agent, or a basic blend in Terminology E1519. Part B provides a measure of the buffer capacity of the
adjuvant. This can be used to estimate the amount of a buffer that will be required to keep a spray solution at the desired pH.
4.3 Other pH standards can be used (see Test Method E70) as long as the pHs measured are not outside the range of the
standards used.
4.4 If samples of the material to be used in a particular application are available, the first method can be used to determine what
adjuvant rate is required to obtain the desired pH. The ability of an adjuvant to adjust the pH of a particular system will depend
on the initial pH before addition.
4.5 The second method can be used to determine the amount of an adjuvant required to change the pH of a quantity of spray
solution to the required value (see Note 1).
NOTE 1—Many acidifiers and basic blends also are buffers, so the pH change does not provide a useful measure of buffer capacity.
5. Apparatus
5.1 pH Meter, accurate to 0.01 unit.
These test methods are under the jurisdiction of ASTM Committee E35 on Pesticides and Alternative Control Agents and are the direct responsibility of Subcommittee
E35.22 on Pesticide Formulations and Delivery Systems.
Current edition approved Oct. 1, 2004.2009. Published October 2004.November 2009. Originally approved in 1997. Last previous edition approved in 20002004 as
E1910 – 004. DOI: 10.1520/E1910-04R09.
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. ForAnnualBookofASTMStandards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
E1910/E1910M – 04 (2009)
5.2 Combination Glass/Calomel Electrode, or separate glass and calomel electrodes or other suitable pH electrode system.
5.3 Beakers, 250 mL.
5.4 Magnetic Stirrer, 120 to 1200 rpm, or equivalent.
5.5 Magnetic Stir Bar, 1 in. (2.5 cm) in length and ⁄8 in. (0.95 cm) in diameter.
5.6 Burette, 50 mL, Class A.
6. Reagents
6.1 Purity of Reagents—Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all
reagents shall conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society where
such specifications are available.
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).
NOTE 2—Type IV grade reagent water may be prepared by distillation, ion exchange, reverse osmosis, electrodialysis, or a combination thereof.
6.3 Synthetic Hard Water Stock, transfer 12.14 g of anhydrous calcium chloride (CaCl ) and 5.55 g of magnesium chloride
hexahydrate (MgCl ·6H O) to a 1000–mL volumetric flask. Dissolve the reagents with approximately 750 mL of water and
2 2
equilibrate to 20°C. Dilute the solution to 1000 mL total volume with water at 20°C, stopper the flask and mix the solution
thoroughly. This mixture has a hardness equivalent to 13680 ppm of calcium carbonate (CaCO ) and is based on a compositional
ratio of 4:1 calcium to magnesium.
6.4 StandardHardWater,equivalenttoatotalhardnessof342ppmofcalciumcarbonate(CaCO ).Transfer25mLofsynthetic
hard water stock by pipette to a 1000 mL volumetric flask and dilute to volume with water at 20°C. Mix the solution thoroughly
(see Note 3).
NOTE 3—It is recommended that the total hardness be checked in accordance withTest Method MT-73, CIPAC 1, EDTAtitration. An alternate method
is provided in Test Method D1126, where the value is represented as CaCO . A value within 6 5 % of the nominal hardness value is acceptable.
6.5 pH Reference Solution, pH 4.00.
6.6 pH Refe
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