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EC number: 202-163-5
CAS number: 92-52-4
A Japanese modified MITI test indicated that biphenyl is readily
biodegradable. Other available screening studies on both ready and
inherent biodegradability support this finding.
Further, several simulation studies for biodegradation in water and
water/sediment systems are available which report reliable information
on the biodegradation of biphenyl. These studies indicate that biphenyl
is biodegraded in water with half-lives of 2-3 days, and half-lives of
2-10 days in aerobic sediment/water systems. Biodegradation of >70% in
28 days based upon CO2 evolution also support that the substance meets
the criteria for rapid degradability. Anaerobic biodegradation can be
considered of limited importance for biodegradation of biphenyl in the
aquatic environment. Based on the available simulation studies, it is
suggested to use 3 days as key half-life for biodegradation in water and
10 days as key half-life for biodegradation in sediment for exposure
calculations. These half-lives were the highest half-lives obtained in
the respective studies and therefore represent a reasonable worst-case
Although soil simulation studies are not required for this readily
biodegradable substance, the available supporting study indicates the
potential for soil microorganisms to adapt to, and fully mineralize, the
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