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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 . 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 ) 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: Many acidifiers and basic blends also are buffers, so the pH change does not provide a useful measure of buffer capacity.
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 .
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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
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
ICS Number Code 65.020.99 (Other standards related to farming and forestry)
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ASTM E1910 / E1910M-15, Standard Test Method for Agricultural pH Control Agents, Measurement of pH Change and Buffering Capacity, ASTM International, West Conshohocken, PA, 2015, www.astm.orgBack to Top