BS EN 71-3 pdf free download

BS EN 71-3-2019 pdf free download.Safety of toys Part 3: Migration of certain elements.
6 Reagents and apparatus
6.1 Reagents
All reagents, including water, used for analysis shall be of analytical grade or, if unavailable, technical grade reagents which have been determined to have acceptably low levels of impurity to allow the analysis to be performed.
6.1.1 Hydrochloric acid solution, c(HCI) = (0,07 ± 0,005) mcI/I.
6.1.2 Hydrochloric acid solution, c(HCI) = (0.14 ± 0.010) mol/l.
6.1.3 Hydrochloric acid solution, c(HCI) = approximately 1 mol/l.
6.1.4 Hydrochloric acid solution, c(HCI): approximately 2 mol/l.
6.1.5 Hydrochloric acid solution, c(HCI) = approximately 6 mol/l.
6.1.6 lsooctane, (C8H18), 99 %.
6.2 Apparatus
Standard laboratory equipment and the following shall be used,
6.2.1 Equipment for measuring pH, calibrated and sufficiently accurate for the purposes of this European Standard.
NOTE H.10 contains additional information on equipment for measuring pH.
6.2.2 Centrifuge, capable of centrifuging at high speed to separate the solids (see H.8).
6.2.3 A means to agitate the mixture, at a temperature of(37 ± 2) °C.
An orbital or linear shaker or shaking water bath capable of maintaining the migration solution in constant motion relative to the sample.
6.2.4 Plastic containers of gross volume, between 1,6 times and 5,0 times the volume of hydrochloric acid extract.
6.2.5 High retention filter-paper, ashless filter paper, particle retention in liquids 2,5 pm.
6.2.6 Membrane filters with pore sizes of 0,45 pm and 0,02 pm.
Syringe filters made with a cellulose acetate membrane are recommended for the 0,45 lim filter.
7 Sampling and sample preparation
7.1 Selection of test portions
A sample for testing shall consist of one toy in the form in which it will be marketed. Test portions shall be taken from toy materials of the single toy sample. Identical materials in the toy may be combined and treated as a single test portion but additional toy samples shall not be used to prepare larger test portions. Test portions are taken from each colour of each coy macerial. Test portions may be composed of more than one toy material or colour only when discrete specimens cannot be separated physically, e.g. dot printing, patterned textiles, multi-coloured printed surfaces etc. Such test portions shall be representative of the whole material.
NOTE This requirement does not preclude the preparation of test portions which represent the material and any base material upon which it is deposited.
Analysis of toy materials present in amounts less than 0,010 g is not required (see H.5).
The above does not preclude the testing of toy materials before they are used to manufacture a toy (raw materials). In these cases, the manufacturing process shall be assessed in order to ensure that it does not influence the migration of elements from the toy materials.
7.2 Sample preparation
7.2.1 General
Appropriate blank solutions shall be analysed so that appropriate corrections can be made when necessary (e.g. contamination of reagents and materials). If the blank result exceeds half of the lowest value the laboratory intends to report (laboratory’s reporting limit) at least two blank solutions shall be analysed and the analytical result shall be corrected by the average value of the blank solutions.
7.2.2 Sampling
Whenever possible obtain a test portion of not less than 0,100 g of each toy material of the laboratory sample using the appropriate sampling method specified in Table 3.BS EN 71-3 pdf download.