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Physical & Chemical properties

Additional physico-chemical information

Administrative data

Endpoint:
other: buffer capacity
Type of information:
experimental study
Adequacy of study:
supporting study
Study period:
2013
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods with acceptable restrictions

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2013
Report date:
2013

Materials and methods

Test guidelineopen allclose all
Qualifier:
according to guideline
Guideline:
other: Young et al.
Qualifier:
according to guideline
Guideline:
other: German TRGS 200, Annex I
Principles of method if other than guideline:
Determination of the alkaline or acidic reserve (buffer capacity) of a substance
GLP compliance:
no

Test material

Constituent 1
Chemical structure
Reference substance name:
Hexahydro-2H-azepin-2-one, sodium salt
EC Number:
218-336-3
EC Name:
Hexahydro-2H-azepin-2-one, sodium salt
Cas Number:
2123-24-2
Molecular formula:
C6H11NO.Na
IUPAC Name:
hexahydro-2H-azepin-2-one, sodium salt

Results and discussion

Results:
For sodium caprolactamat, the alkaline reserve was determined to be 5.13g (NaOH).

With this value, an estimation of the corrosive potential of the substance can be performed:
A substance has to be considered as corrosive, if the sum of the pH value and 1/12 of the alkaline reserve is higher than 14.5.

For sodium caprolactamat, this calculation results in 13.1 + 1/12*5.13 = 13.5

As this value is lower than 14.5, the substance would not have to be conisdered as "corrosive".

Applicant's summary and conclusion

Conclusions:
Although the determination of the alkaline reserve according to Young. would not result in a classification as "corrosive", the classification is applied as the pH value of the substance itself is 13.1 which is already higher than 11.5.