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ASTM D 6692 Document Information:
Title
Standard Test Method for Determining the Biodegradability of Radiolabeled Polymeric Plastic Materials in Seawater
ASTM International
Publication Date:
Jun 10, 2001
Scope:
1. Scope
1.1 This test is used to determine the degree of aerobic
biodegradation of polymeric compounds
utilized in plastic materials by determining the level of respiration
of such radiolabeled carbon
compounds to radiolabeled carbon dioxide.
1.2 The test is designed to utilize the naturally occurring microbes
in seawater as the inoculum
for the enrichment and subsequent mineralization (biodegradation) of
the test polymer using it as a
carbon and energy source resulting in a carbon dioxide as an end
product.
1.3 The test method requires that the polymers to be assayed are
synthesized using the
radioisotope, carbon-14, and that the compound or plastic material be
uniformly labeled with
carbon-14.
1.4 As controls, known biodegradable compounds, such as glucose or
starch, also uniformly labeled
with carbon-14, are run in order to determine the biological activity
of the natural population.
1.5 The concentration of added polymers shall be kept low so as not to
cause limitation by oxygen,
and the seawater inoculum is amended with nitrogen and phosphorus
compounds to ensure that growth
in not limited by these nutrients.
1.6 The safety problems and regulations associated with working with
radioactive materials are not
addressed in the method. It is the responsibility of the individual
users to establish and ensure
adherence the proper safety, health, monitoring and all regulatory
practices associated with the
use of radioactive compounds.
1.7 There is no similar or equivalent ISO standard.
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