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- Practical Guide -
Page 119 of 153
Variability of the lead and/or cadmium migration of individual ceramic articles has been
taken in account:
Article 2.5
However, where a ceramic article does not exceed the above quantities by more than 50 %, that article shall nevertheless be
recognised as satisfying the requirements of this Directive if at least three other articles with the same shape, dimensions,
decoration and glaze are subjected to a test carried out under the conditions laid down in Annexes I and II and the average
quantities of lead and/or cadmium extracted from those articles do not exceed the limits set, with none of those articles
exceeding those limits by more than 50 %.
Nota bene. The Directive did not provide the procedure of the three consecutive attacks with
the simulant, as the number of the samples to be checked is very large and the volatility of
the acetic acid can create problems for the analysts.
4.
Method for the determination of migration of lead and cadmium
Test conditions such as 'simulant' liquid composition, test duration, lighting conditions,
surface determination, and contact between 'simulant' liquid and test article, are laid down in
Annex I of the Directive.
The determination of the specific migration of lead and/or cadmium is carried out by atomic
absorption spectrophotometry. Reagents, stock solutions, detection limits and other
measurement specifications are set out in Annex II of the Directive.
A CEN standard (=EN 1388, Parts 1 and 2)
established the details of the analytical procedure.