BS EN 10136:2019 pdf download.Steels and cast irons – Determination of nickel content – Flame atomic absorption spectrometric method (FAAS).
2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN ISO 648, Laboratory glassware — Single-volume pipettes (ISO 648) EN ISO 1042, Laboratory glassware — One-mark volumetric flasks (ISO 1042) EN ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical composition (ISO 14284)
3 Terms and definitions No terms and definitions are listed in this document. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — IEC Electropedia: available at http://www.electropedia.org/ — ISO Online browsing platform: available at http://www.iso.org/obp
4 Principle Dissolution of a test portion in a mixture of appropriate acids and fuming with perchloric acid. Nebulisation of the test solution into an air/acetylene flame of an atomic absorption spectrometer. Spectrometric measurement of the atomic absorption of the 232,0 nm or 352,5 nm spectral line emitted by a nickel hollow-cathode lamp. NOTE Other suitable radiation sources can also be used, provided the criteria in 6.2.2 and 6.2.3 are still met.
5.6 Iron base solution, 40 g/l. Weigh, to the nearest 0,01 g, 10,00 g of pure iron (5.1) and transfer into a heat-resistant glassware of suitable size. Add 100 ml of the hydrochloric-nitric acids mixture (5.2), cover the glassware with a watch glass and heat gently until the iron is dissolved. Add 150 ml of the nitric-perchloric acids mixture (5.3) and heat until dense white fumes of perchloric acid appear. Continue heating for one minute and allow to cool. In order to get a better mastery of the acidity (volume of free perchloric acid) of the sample solutions and of the calibration solutions, perchloric fumes may be maintained until iron crystallizes. Add 100 ml of water and heat gently to dissolve the salts. Cool again and transfer the solution quantitatively into a 250 ml one-mark volumetric flask. Dilute to the mark with water and mix. 5.7 Iron base solution, 2 g/l. Transfer 10,0 ml of iron base solution (5.6) into a 200 ml one-mark volumetric flask. Dilute to the mark with water and mix.
6 Apparatus 6.1 Ordinary laboratory apparatus All volumetric glassware shall be class A, in accordance with EN ISO 648 or EN ISO 1042, as appropriate. 6.2 Atomic absorption spectrometer 6.2.1 General The spectrometer shall be equipped with a nickel hollow-cathode lamp or other suitable radiation source and supplied with air and acetylene sufficiently pure to give a steady clear fuel-lean flame, free from water and oil, and free from nickel. The atomic absorption spectrometer used will be satisfactory if, after optimization according to 8.3.4, the limit of detection and characteristic concentration are in reasonable agreement with the values given by the manufacturer and it meets the performance criteria given in 6.2.2 and 6.2.3.BS EN 10136 pdf download.