Overview
ISO 19976-1:2019 specifies a laboratory method for the determination of cadmium (Cd) mass fraction in copper, lead and zinc sulfide concentrates using flame atomic absorption spectrometry (FAAS / AAS). The standard defines sample preparation, reagents, apparatus, calibration and calculation procedures to produce reliable, comparable results. Applicable concentration ranges are:
- Copper sulfide concentrates: 0.01 % to 0.30 % Cd
- Lead sulfide concentrates: 0.01 % to 0.30 % Cd
- Zinc sulfide concentrates: 0.05 % to 0.30 % Cd
The document includes safety warnings for hazardous reagents (e.g., hydrofluoric and perchloric acids) and requires analytical-grade reagents and controlled laboratory glassware.
Key topics and technical requirements
- Principle: Dissolution of test portion in HCl and HNO3, silicon removal with HF, oxidation with HClO4, and Cd quantification by FAAS with background correction.
- Instrument conditions: FAAS with a cadmium hollow-cathode lamp and deuterium lamp for background correction; recommended flame air–acetylene, wavelength 228.8 nm, slit width 0.2 nm.
- Reagents & standards: Preparation of cadmium primary and working standards (1 mg/ml, 100 µg/ml, 10 µg/ml) and calibration solutions (0.0 to 1.0 µg Cd per ml).
- Sample handling: Laboratory and test sample preparation per ISO 12743 and ISO 9599; test portion ~0.50 g (with alternative pre-dried procedure in Annex A).
- Procedure: Duplicate determinations, blank tests, dissolution sequence, filtration for lead concentrates, volumetric dilution guides to fit calibration range.
- Quality: Requirements for repeatability, between-laboratory precision, trueness checks and reporting of results (including use of certified reference materials).
Applications and users
ISO 19976-1:2019 is intended for:
- Metallurgical laboratories and analytical chemists analyzing sulfide concentrates for cadmium content
- Mining companies, concentrate traders and smelters verifying product quality and compliance
- QA/QC teams monitoring impurity levels that affect metallurgical processing, environmental compliance and commercial grading
Practical benefits include standardized sample preparation and measurement procedures that support reproducible cadmium determinations, traceability through calibration standards, and consistent reporting across laboratories.
Related standards
Normative references cited in ISO 19976-1:2019 include:
- ISO 12743 - Sampling procedures for metal and moisture content
- ISO 9599 - Determination of hygroscopic moisture content (gravimetric)
- ISO Guide 35 - Reference materials guidance
- ISO 385, ISO 648, ISO 1042, ISO 4787 - Laboratory glassware and volumetric instrument standards
Keywords: ISO 19976-1:2019, cadmium determination, flame atomic absorption spectrometry, copper sulfide concentrates, lead sulfide concentrates, zinc sulfide concentrates, AAS calibration, sample preparation, metallurgical laboratory.
