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.

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.