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EC number: 247-477-3 | CAS number: 26140-60-3
Endpoint summary
Administrative data
Description of key information
Additional information
Biodegradation in water:
The available studies – although not all with GLP declaration – are all of good quality, using standard protocols. All studies are used in a Weight of Evidence approach to support the final conclusions.
Indeed all aquatic biodegradation tests show that terphenyl mixtures are not ready biodegradable. Since the substance is composed of three main constituents: o-, m- and p-terphenyl, these were also evaluated seperately. Looking at the individual terphenyls m-terphenyl is moderately degradable, o-terphenyl displays a certain level of biodegradation but p-terphenyl appears to be rather persistent. On a terphenyl 'mixture' level it could therefore be concluded that Terphenyl mixtures are persistent in water. On a constituent level however, this can be concluded for p-terphenyls, but for o-terphenyl and definitely for m-terphenyl biodegradation does occur and these constituents should not be regarded as persistent.
Biodegradation in soil:
The simulation test in soil was performed on Therminol – a mixture of terphenyl, quatraphenyl and polyphenyl. The disappearance of these individual groups was measured during 32 weeks. Results show that the smallest compound, Terphenyl, was degraded substantially by means of biological degradation with half times – dependent upon soil quality – between 8-28 weeks.
It is concluded that terphenyl mixtures are slowly degradable in soil.
Overview of the relevant studies:
test |
ref |
Test substance |
Endpoint |
|
interpretation |
Test quality |
SCAS |
1048006 |
Therminol 88 (o, m, p) |
Disappearance |
12+/-7 %
|
Persistant
|
Not GLP |
SCAS |
AC75SS15 1976 |
Therminol 88 (o, m, p) |
Disappearance |
12% |
Persistant |
Not GLP |
CO2 evolution |
ES82SS22 1982 |
MCS1980 (read-across) |
CO2 production (16-30d) |
<10% ultimate degradation 100% transformation |
Degrades into more persistent intermediates |
Not GLP |
CO2 evolution- commercial inoculum |
ES83SS42 1983 |
m-terphenyl
o-terphenyl, p-terphenyl |
CO2 production (55d) |
38% (>25% of theoretical (2-3 days for adaptation))
20% (= 20% of theoretical) 10% (< 20% of theoretical) |
Moderate
Moderate Persistent |
Not GLP |
CO2 evolution Adapted inoculum |
ES91SS07 1991 |
p- terphenyl |
CO2 production (42d) |
At 11 mg/l: 9% of theoretical, 81% recovery At 21 mg/l: 8 % of theoretical, 78% recovery |
Persistent |
GLP |
River die away |
ES83ss35 1983 |
o- , m- terphenyl
p-terphenyl |
Disappearance |
Starts after 16-28 d adaptation
No degradation within 42 d |
Moderate
Persistent |
Not GLP |
Screening in soil - simulation |
803206, 1989 |
Therminol: Terphenyl
|
Disappearance
|
t1/2 = 8.1 – 28.4w
|
Mainly biological degradation |
GLP |
Photolysis |
ES 83 SS 33 |
o-, p-terphenyl m terphenyl |
Disappearance Disappearance |
0% decrease after 29 days About 20% decrease (29 days) |
No photolysis No significant photolysis |
Not GLP |
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