AS NZS 8124.12:2017 pdf free

AS NZS 8124.12:2017 pdf free.Safety of toys
Only reagents of recognized analytical grade or equivalent shall be used. The concentration of the analyte or interfering substances in the reagents and water shall be negligible compared to the lowest concentration to be determined.”Trace metal” grade or equivalent reagents shall be used for the calibration standards used for the final instrumentation quantification stage.
Microwave sample preparation system equipped with a sample holder and high-pressure microwave digestion vessels (5.2.2, high pressure microwave digestion vessel).
NOTE 1 Some newer models of microwave digestion systems do not utilise high-pressure digestion vessels and these systems are considered as a suitable alternative provided they give an equivalent performance.
NOTE 2 There are many safety and operational recommendations specific to the model and manufacturer of the microwave equipment used in individual laboratories. The analyst is required to consult the specific equipment manual, manufacturer, and literature for proper and safe operation of the microwave equipment and vessels (see A.3, precautions relating to the use of microwave digestion).
Test portions shall be taken from accessible parts (see ISO 8124-1) of the laboratory sample in accordance with Clause 7 (preparation of test portions). When appropriate, the laboratory sample shall be subjected to relevant tests in accordance with ISO 8124-1, before the accessibility is considered. Identical materials in the laboratory sample can be combined and treated as a single test portion, but the use of additional laboratory samples is not permitted. If it is not possible to obtain at least 10 mg, no further testing shall be conducted and this shall be reported under Clause 11 c) (test report).
The compositing of dissimilar materials is not permitted, e.g. compositing textiles and paint coatings.When calculating the concentration of a target element in a material, it is assumed that all of that element found in the digested sample originated from any one of the composited materials. Using this assumption and the masses of the individual materials, the total concentration of the target element is calculated for each individual material in the composite test portion.AS NZS 8124.12 pdf free download.