United States Prevention, Pesticides EPA712-C-96-030
Environmental Protection and Toxic Substances August 1996
Agency (7101)
&EPA Product Properties
Test Guidelines
OPPTS 830.7000
pH
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INTRODUCTION
This guideline is one of a series of test guidelines that have been
developed by the Office of Prevention, Pesticides and Toxic Substances,
United States Environmental Protection Agency for use in the testing of
pesticides and toxic substances, and the development of test data that must
be submitted to the Agency for review under Federal regulations.
The Office of Prevention, Pesticides and Toxic Substances (OPPTS)
has developed this guideline through a process of harmonization that
blended the testing guidance and requirements that existed in the Office
of Pollution Prevention and Toxics (OPPT) and appeared in Title 40,
Chapter I, Subchapter R of the Code of Federal Regulations (CFR), the
Office of Pesticide Programs (OPP) which appeared in publications of the
National Technical Information Service (NTIS) and the guidelines pub-
lished by the Organization for Economic Cooperation and Development
(OECD).
The purpose of harmonizing these guidelines into a single set of
OPPTS guidelines is to minimize variations among the testing procedures
that must be performed to meet the data requirements of the U. S. Environ-
mental Protection Agency under the Toxic Substances Control Act (15
U.S.C. 2601) and the Federal Insecticide, Fungicide and Rodenticide Act
(7U.S.C. I36,etseq.).
Final Guideline Release: This document is available from the U.S.
Government Printing Office, Washington, DC 20402 on The Federal Bul-
letin Board. By modem dial 202-512-1387, telnet and ftp:
fedbbs.access.gpo.gov (IP 162.140.64.19), internet: http://
fedbbs.access.gpo.gov, or call 202-512-0132 for disks or paper copies.
This guideline is available in ASCII and PDF (portable document format)
from the EPA Public Access Gopher (gopher.epa.gov) under the heading
"Environmental Test Methods and Guidelines."
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OPPTS 830.7000 pH.
(a) Scope—(1) Applicability. This guideline is intended to meet test-
ing requirements of both the Federal Insecticide, Fungicide, and
Rodenticide Act (FIFRA) (7 U.S.C. 136, et seq.} and the Toxic Substances
Control Act (TSCA) (15 U.S.C. 2601).
(2) Background. The source materials used in developing this har-
monized OPPTS test guideline are the OPPT guideline under 40 CFR
796.1450 pH of water solutions or suspensions and OPP guideline 63-
12 pH (Pesticide Assessment Guidelines, Subdivision D: Product Chem-
istry, EPA Report 540/9-82-018, October 1982).
(b) Purpose. This test guideline references methodology to develop
data on the pH of aqueous solutions and suspensions of chemical sub-
stances and mixtures. The data may be used to calculate the degree of
acidity or basicity of aqueous solutions or suspensions that will be formed
by a chemical substance and to evaluate the resulting effects the substance
will have on human health and the environment. The pH may be used
in the design of other tests.
(c) Test Procedures. (1) The electrometric method is recommended
for determining the pH of an aqueous solution or suspension. The rec-
ommended apparatus should consist of a pH meter and electrodes, meeting
performance standards and specifications as described, for example, in
ANSI/ASTM E 70-7700 and in ASTM D 1293-78 (see paragraph (d)(l)
of this guideline) or the method as described in CIPAC MT 75 (see para-
graph (d)(2) of this guideline)).
(2) It is recommended that the water used in preparing solutions or
suspensions meet the standards for type I or type II reagent water specified
by ANSI/ASTM D 1193-77 and be free of C02 (see paragraph (d)(l) of
this guideline). For chemical substances that are readily soluble in water,
the test guideline recommends that a solution of 1 percent by mass be
used. For chemical substances that are soluble in water to an extent of
less than 1 percent by mass at 25 °C, an aqueous suspension of the chemi-
cal substance should be tested.
(d) References. The following references should be consulted for ad-
ditional background material on this test guideline.
(1) American Society for Testing and Materials, "Annual Book of
ASTM Standards," ASTM, 1916 Race St., Philadelphia, PA, (latest edi-
tion).
(2) Collaborative International Pesticide Analytical Council, Ltd.
(CIPAC) Handbook, "MT 75 Determination of pH," CIPAC, Hatching
Green, Harpenden, Hertfordshire, England (1970).
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