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ASTM E 896 Document Information:
Title
Standard Test Method for Conducting Aqueous Direct Photolysis Tests
ASTM International
Publication Date:
Dec 15, 1992
Scope:
This test method describes procedures for obtaining information
on direct photolysis rates, quantum yields, and phototransformation
products of materials in an aqueous environment. Laboratory testing
procedures designed to provide estimates of environmental rates of
photolysis are described.
A three-tiered approach is described. The testing procedures are
designed to provide basic and easily obtainable information in the
first tier. More detailed and costly experiments are proposed in
the second and third tiers. This approach is thought to be more
scientific and cost-effective than one which provides for no
sequential assessment. It is not within the scope of this test
method to provide decision points to move from one tier to the
next. The degree of testing should be decided as part of an overall
exposure assessment in which the importance of photolysis is
weighed with respect to other transformation routes.
These procedures are designed to be applicable to all types of
materials. However, tests on formulations and commercial products
that are complex mixtures of materials with diverse physical and
chemical properties may require isolation of individual compounds
prior to testing to eliminate indirect photochemical reactions.
With slight modification, these procedures should meet the needs of
most investigators.
In developing this test method an attempt was made to balance
the needs and costs against the scientific considerations and
reliability of results. Major considerations were: (1)
that the procedures generate precise, accurate, and environmentally
relevant data, and (2) that the procedural requirements be
as flexible as possible without destroying this integrity of the
data and the ability to compare interlaboratory results.
Since all details are not covered in this test method,
successful execution of the described tests will require some
training or experience in the area of photolysis. Familiarity with
the material in the references is essential. Detailed descriptions
on conducting similar test procedures have been published by the
U.S. Environmental Protection Agency (1, 2).2
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. For specific hazard statements, see
Section 6.
2 The boldface numbers in parentheses refer to the
list of references at the end of this test method.
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