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Additional physico-chemical information

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Reference
Endpoint:
additional physico-chemical information
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
other: OECD 101
Deviations:
not specified
GLP compliance:
no
Endpoint investigated:
light stability

UV-VIS spectrophotometry was used to determine the molar absorption coefficient (ɛ):

In neutral test solution :

ɛ= 10600 L/mol/cm at λmax 244 nm 

ɛ= 950 L/mol/cm at λmax 280 nm

In acidic test solution :

ɛ= 10700 L/mol/cm at λmax 245 nm 

ɛ= 990 L/mol/cm at λmax 280 nm

In basic test solution :

ɛ= 10600 L/mol/cm at λmax 245 nm 

ɛ= 980 L/mol/cm at λmax 280 nm

No detectable absorption was found from 380 up to 900 nm

There is a second shoulder at 330 nm in all spectra (netral, acid, basic), which is very faint with about 100 L*cm-1*mol-1. Because of the low and scattering values no single results are reported.

Conclusions:
The absorption (λmax) of test solutions (neutral, acid, basic) were detected at 244 nm and at 280 nm in the UV light range.
The maximun molar absorption coefficient of neutral solution was determined to be ɛ= 10600 L/mol/cm at λmax 244 nm and ɛ= 950 L/mol/cm at λmax 280 nm. No detectable absorption was found above 380 nm.
Executive summary:

In this guideline (OECD 101) study, the test material (EC 231-272-0) was determined to be light sensitive

Description of key information

 Study conducted to recognised training guidelines

Additional information

The UV-VIS spectrophotometry was used to determine the molar absorption coefficient (ɛ).

The maximum absorption (λmax) of test solutions (neutral, acid, basic) were detected at 244 nm and at 280 nm in the UV light range.

The molar extinction coefficient of neutral solution was determined to be ɛ= 10600 L/mol/cm at λmax 244 nm and ɛ= 950 L/mol/cm at λmax 280 nm. No detectable absorption was found above 380 nm.