ASTM E1910/E1910M-15
(Test Method)Standard Test Method for Agricultural pH Control Agents, Measurement of pH Change and Buffering Capacity
Standard Test Method for Agricultural pH Control Agents, Measurement of pH Change and Buffering Capacity
SIGNIFICANCE AND USE
4.1 This test method is intended for products sold as tank mix adjuvants for use with agricultural products.
4.2 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.
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.
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 − 15
Standard Test Method for
Agricultural pH Control Agents, Measurement of pH Change
1
and Buffering Capacity
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. Significance and Use
1.1 These test methods cover determining if an adjuvant
4.1 This test method is intended for products sold as tank
meets the definitions of an acidifier, a basic blend, alkalinity
mix adjuvants for use with agricultural products.
agent, or buffer in Terminology E1519.
4.2 Part A provides a determination of whether the pH
1.2 The values stated in either SI units or inch-pound units
modification characteristics of the adjuvant tested meet the
are to be regarded separately as standard. The values stated in
definition of an acidifier, alkalinity agent, or a basic blend in
each system may not be exact equivalents; therefore, each
Terminology E1519. Part B provides a measure of the buffer
system shall be used independently of the other. Combining
capacity of the adjuvant. This can be used to estimate the
values from the two systems may result in non-conformance
amountofabufferthatwillberequiredtokeepaspraysolution
with the standard.
at the desired pH.
1.3 This standard does not purport to address all of the
4.3 Other pH standards can be used (see Test Method E70)
safety concerns, if any, associated with its use. It is the
as long as the pHs measured are not outside the range of the
responsibility of the user of this standard to establish appro-
standards used.
priate safety and health practices and determine the applica-
4.4 If samples of the material to be used in a particular
bility of regulatory limitations prior to use.
application are available, the first method can be used to
2. Referenced Documents determine what adjuvant rate is required to obtain the desired
2
pH. The ability of an adjuvant to adjust the pH of a particular
2.1 ASTM Standards:
system will depend on the initial pH before addition.
D1126 Test Method for Hardness in Water
D1193 Specification for Reagent Water
4.5 Thesecondmethodcanbeusedtodeterminetheamount
E70 Test Method for pH of Aqueous Solutions With the
of an adjuvant required to change the pH of a quantity of spray
Glass Electrode
solution to the required value (see Note 1).
E200 Practice for Preparation, Standardization, and Storage
NOTE 1—Many acidifiers and basic blends also are buffers, so the pH
of Standard and Reagent Solutions for ChemicalAnalysis
change does not provide a useful measure of buffer capacity.
E1519 Terminology Relating to Agricultural Tank Mix Ad-
juvants
5. Apparatus
3. Summary of Test Method
5.1 pH Meter, accurate to 0.01 unit.
3.1 Test Method A measures the change in pH of a sample
5.2 CombinationGlass/CalomelElectrode,orseparateglass
on the addition of an acidifier or a basic blend. Test Method B
and calomel electrodes or other suitable pH electrode system.
measures the buffer capacity of the adjuvant by titration.
5.3 Beakers, 250 mL.
5.4 Magnetic Stirrer, 120 to 1200 rpm, or equivalent.
1
These test methods are under the jurisdiction of ASTM Committee E35 on
3
Pesticides, Antimicrobials, and Alternative Control Agentsand are the direct
5.5 Magnetic Stir Bar, 1 in. (2.5 cm) in length and ⁄8 in.
responsibility of Subcommittee E35.22 on Pesticide Formulations and Delivery
(0.95 cm) in diameter.
Systems.
Current edition approved Oct. 1, 2015. Published November 2015. Originally
5.6 Burette, 50 mL, Class A.
approved in 1997. Last previous edition approved in 2009 as E1910/
E1910M – 04(2009). DOI: 10.1520/E1910_E191M-15.
2
6. Reagents
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
6.1 Purity of Reagents—Reagent grade chemicals shall be
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. used in all tests. Unless otherwise indicated, it is intended that
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
E1910/E1910M − 15
NOTE 4—Other or additional reference standards may be used (see Test
all reagents shall conform to the specifications of the Commit-
Method E70) as long as the pHs measured are not outside the range of the
tee on Analytical Reagents of the American Chemical Society
standards used.
where such specifications are available.
7.3 Place a clean stir bar and 100 mLof standard hard water
6.2 Purity of Water— Unless otherwise indic
...
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/E1910M − 04 (Reapproved 2009) E1910/E1910M − 15
Standard Test Method for
Agricultural pH Control AgentsAgents, Measurement of pH
1
Change and Buffering Capacity
This standard is issued under the fixed designation E1910/E1910M; 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
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.
2. Referenced Documents
2
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 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.
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).
1
These test methods are under the jurisdiction of ASTM Committee E35 on Pesticides Pesticides, Antimicrobials, and Alternative Control Agentsand are the direct
responsibility of Subcommittee E35.22 on Pesticide Formulations and Delivery Systems.
Current edition approved Oct. 1, 2009Oct. 1, 2015. Published November 2009 November 2015. Originally approved in 1997. Last previous edition approved in 20042009
as E1910 – 04.E1910/E1910M – 04(2009). DOI: 10.1520/E1910-04R09.10.1520/E1910_E191M-15.
2
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 Standards
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
1
---------------------- Page: 1 ----------------------
E1910/E1910M − 15
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.
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.
3
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
...
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