ISO 19976-1:2019 Copper, lead and zinc sulfide concentrates – Determination of cadmium – Part 1: Flame atomic absorption spectrometric method

ISO 19976-1:2019 Copper, lead and zinc sulfide concentrates – Determination of cadmium – Part 1: Flame atomic absorption spectrometric method. This document specifies a flame atomic absorption spectrometric method for the determination of the mass fraction of cadmium in copper, lead and zinc sulfide concentrates as follows: a) for copper sulfide concentrates, the method is applicable to the determination of mass fractions of cadmium from 0,01 % to 0,30 %; b) for lead sulfide concentrates, the method is applicable to the determination of mass fractions of cadmium from 0,01 % to 0,30 %; c) for zinc sulfide concentrates, the method is applicable to the determination of mass fractions of cadmium from 0,05 % to 0,30 %. 2 Normative reference 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. ISO 385, Laboratory glassware — Burettes ISO 648, Laboratory glass ware — Single-volume pipettes ISO 1042, Laboratory glass ware — One-mark volumetric flasks ISO 4787, Laboratory glassware — Volumetric instruments — Methods for testing of capacity and for use ISO 9599, Copper, lead, zinc and nickel sulfide concentrates — Determination of hygroscopic moisture content of the analysis sample — Gravirnetric method ISO 12743, Copper, lead, zinc and nickel concentrates — Sampling procedures for determination of metal and moisture content ISO Guide 35, Reference materials — Guidance for characterization and assessment of homogeneity and stability 3 Terms and definitions No terms and definitions are listed in this document. ISO and IEC maintain term inological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso.org/obp 5.8 Cadmium, standard solution, 1 ml contains 1 mg of Cd. Weigh, to the nearest 0,1 rng, 1,000 0 g of cadmium metal (5.7) into a 250 ml beaker. Add 10 ml of water and 5 ml of nitric acid (5A). Cover and warm gently (if necessary) until the cadmium metal is dissolved. [feat to remove nitrogen oxides, then allow to cool and add about 50 ml of water. Transfer the solution to a 1 000 ml one-mark volumetric flask, add 40 ml of hydrochloric acid (5.2), fill up nearly to the mark with water, mix and cool to room temperature, then fill up...