EN 71-3-2019 pdf download.Safety of toys – Part 3 : Migration of certain elements.
8.3.1.2 pH control after migration (see H.10)
After completing migration the pH shall be checked in order to ensure that the correct pH has been maintained throughout the migration procedure. If it is possible to demonstrate that there is no variation of the pH for certain materials (e.g. plastic) it is not necessary to control the pH for that material after migration.
Migration solutions with a pH less than 1,10 or greater than 1.30 which have been adjusted according to 8.2.2 (pH adjustment — no buffering effect by toy material) shall be discarded and a new test portion shall be analysed using the migration procedure for toy materials with high buffering capacity (see 8.2.3, pH adjustment — buffering effect by toy material).
For migration solutions with a pH less than 1.10 or greater than 1.30 which have been adjusted according to 8.2.3 (pH adjustment — buffering effect by toy material) the pH measured after migration shall be indicated in the test report.
It is sufficient to carry out the pH control check for one solution from each material type within a batch. If the p11 measured is less than 1,10 or more than 1,30 the remaining solutions in the batch for test portions of that type shall also be checked.
8.3.2 Filtration (see H.8)
8.3.2.1 General
Without delay separate the solid matter from the solution by filtration through a membrane filter with a pore size of 0,45 Itm (see 6.2.6). In case filtration is very slow, centnlugation (see H.8) may be used to remove particles before filtration.
For special concerns regarding high copper results see 8.3.2.2 (samples exceeding the copper limit value).
8.3.2.2 Samples exceeding the copper limit value
In some rare cases high copper results can be obtained due to minute particles of copper containing insoluble matter (normally indicated by e.g. a Tyndall beam or a blue or green coloured filtrate). When the migration limits for copper are exceeded repeat the migration and filtration steps using a membrane filter (see 6.2.6) with a pore size of 0,02 tIm. It is recommended to centrifuge the migration mixture (see H.8) and filter it with a 0,45 tm filter before the final filtration with a 0,02 tim filter in order to remove insoluble copper containing particles.
9 Stabilization and analysis of migration solutions
9.1 General
The methods specified in 9.2 to 9.4 each require a certain volume of the prepared migration solution (see
8.3, migration procedure). Approximately 4 ml are required for the analysis for general elements, at least
2 ml for Chromium (Vt) analysis and approximately 5 ml for organic Tin analysis.
Whilst it is acceptable to dilute migration solutions in order to provide sufficient volumes for the analyses, care should be taken to do this accurately and without compromising the laboratory’s limit of detection and other analytical quality parameters.
9.2 General elements
If the migration solutions (see 8.3, migration procedure) are to be retained for more than 24 h prior to analysis, they shall be stabilized by the addition of a suitable amount of hydrochloric acid such that the concentration IICI of the stored solution is approximately 1 mol/l.
Analyse the migration solution according to Annex E.
Alternative methods of analysis or modifications to the methods of this European Standard are acceptable only if they are capable of achieving at least the accuracy and precision of the methods specified in Annex E. The sensitivity of any alternative methods or modifications shall be adequate and they shall have been validated to show that the results achieved are equivalent to those of the methods in this document. In particular, the limits of quantification (LOQ) shall not be greater than 50 % of the respective limit values specified in Table 2.
NOTE Experience has shown that the detection using ICPOES is suitable for category III toy materials.
9.3 Chromium (VI)
Neutralize the migration solution (see 8.3, migration procedure) according to F.4 without delay. After neutralization the solution is stable for at least 4 h.EN 71-3-2019 pdf download.