AS/NZS 8124.12:2017 pdf free.Safety of toys Part 12: Determination of total concentration of certain elements in toys (ISO 8124-5:2015, MOD).
5 Reagents and apparatus
5.1 Reagents
Only reagents of recognized analytical grade or equivalent shall he 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.
5.1.1 Nitric acid, concentrated, 1,40 g/ml, 65 % (v/i’), “analytical” grade.
5.1.2 Nitric acid, 10 % (v/v): Add 100 ml concentrated nitric acid (5jj) to 500 ml water (5.1.4). Dilute to 1 000 ml with water (5.1.4).
5.1.3 Hydrochloric acid, concentrated, 119 g/ml, 37 % (v/i’), “analytical” grade.
5.1.4 Water, of at least grade 3 purity, in accordance with ISO 3696.
5.1.5 Hydrogen peroxide, 30 % (v/v).
NOTE Hydrogen peroxide which is not stabilized must be stored at cold (4 °C or less) temperatures.
5.1.6 Methylene chloride, “analytical” grade.
5.1.7 Acetone/ethanol solution, 1:1 mixture of absolute ethanol and acetone (“analytical’ grades).
5.2 Apparatus
All glassware shall he soaked in 10 % (v/v) nitric acid (5.1.2) for at least 2 h and then rinsed in delonised water before use.
5.2.1 Microwave digestion system
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).
5.2.2 High pressure microwave digestion vessel
Closed-top vessel specifically designed for microwave digestion, of suitable capacity. It is recommended to use a vessel capable of withstanding a temperature ofat least 225°C and an internal pressure ofat least 3 000 kPa. The liner of the vessel shall be PTFE (polytetrafluoroethylene)/TFM [tris-(a-trifluoromethyl3, 3-difluorovinyl)-1,3,5-enzenetricarboxylate, or PTFE/PFA (perfluoroalkoxyethylene) or another chemically inert material. Vessels shall also be equipped with a safety relief valve or disc that will prevent vessel rupture or ejection of the vessel cap.AS/NZS 8124.12 pdf download.