ASTM E1898-21 PDF
Standard Test Method for Determination of Silver in Copper Concentrates by Flame Atomic Absorption Spectrometry
Standard Test Method for Determination of Silver in Copper Concentrates by Flame Atomic Absorption Spectrometry
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 5
- Дата публикации:
- 1 октября 2021 г.
- Издание:
- E1898
- ICS:
- 71.040.50
SIGNIFICANCE AND USE 5.1 In the primary metallurgical processes used by the mineral processing industry for copper bearing ores, copper and silver associated with sulfide mineralization are concentrated by the process of flotation for recovery of the metals. 5.2 This test method is a comparative method and is intended to be a referee method for compliance with compositional specifications for metal content or to monitor processes. 5.3 It is assumed that all who use this method will be trained analysts capable of performing skillfully and safely. It is expected that work will be performed in a properly equipped laboratory and that proper waste disposal procedures will be followed. Appropriate quality control practices must be followed such as those described in Guide E882. SCOPE 1.1 This test method covers the determination of silver in the range of 13 μg/g to 500 μg/g by acid dissolution of the silver and measurement by atomic absorption spectrometry. Copper concentrates are internationally traded within the following content ranges: Element Unit Content Range Aluminum % 0.05 to 2.50 Antimony % 0.0001 to 4.50 Arsenic % 0.01 to 0.50 Barium % 0.003 to 0.10 Bismuth % 0.001 to 0.16 Cadmium % 0.0005 to 0.04 Calcium % 0.05 to 4.00 Carbon % 0.10 to 0.90 Chlorine % 0.001 to 0.006 Chromium % 0.0001 to 0.10 Cobalt % 0.0005 to 0.20 Copper % 10.0 to 44.0 Fluorine % 0.001 to 0.10 Gold μg/g 1.40 to 100.0 Iron % 12.0 to 30.0 Lead % 0.01 to 1.40 Magnesium % 0.02 to 2.00 Manganese % 0.009 to 0.10 Mercury μg/g 0.05 to 50.0 Molybdenum % 0.002 to 0.25 Nickel % 0.0001 to 0.08 Silicon % 0.40 to 20.0 Silver μg/g 18.0 to 8000 Sulfur % 10.0 to 36.0 Tin % 0.004 to 0.012 Zinc % 0.005 to 4.30 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Abstract
Overview
ASTM E1898-21, titled "Standard Test Method for Determination of Silver in Copper Concentrates by Flame Atomic Absorption Spectrometry," is an essential standard from ASTM International. It specifies a comparative analytical method for quantifying silver content in copper concentrates. The method is designed as a referee test for ensuring compliance with metal content specifications and for process monitoring in the mineral processing industry, particularly when copper-bearing ores are processed by flotation.
This standard covers the determination of silver in the concentration range of 13 μg/g to 500 μg/g through acid dissolution followed by measurement via atomic absorption spectrometry (AAS), with applications for internationally traded copper concentrates.
Key Topics
- Analytical Method (AAS): The standard outlines the use of flame atomic absorption spectrometry at the specific wavelength (328.1 nm) for the measurement of dissolved silver in copper concentrates.
- Sample Preparation: Procedures for acid dissolution (either HNO3 and HCl or HNO3 and HClO4 methods) are included to ensure complete silver extraction from samples.
- Calibration and Measurement: Detailed steps cover calibration curve creation using prepared silver standards, precise absorbance measurement, and result calculations.
- Quality Control: Emphasizes the importance of following proper laboratory practices, including quality controls as outlined in ASTM Guide E882.
- Precision and Bias: Interlaboratory studies are referenced, demonstrating reproducibility and bias information, confirming the method's reliability as a referee test.
- Safety Considerations: The standard assumes that users are trained analysts operating in compliant laboratories, following all required safety, health, and waste disposal procedures.
Applications
The ASTM E1898-21 method is widely applicable in:
- Mineral Processing and Metallurgical Industry: Used during primary metallurgical operations for evaluating silver and copper content in concentrated ores.
- Trade and Compliance Testing: Provides a referee method for verifying that copper concentrate shipments meet international trading specifications for silver content.
- Process Control: Monitors extraction and refining efficiency by checking silver levels in process streams and end products.
- Laboratory Analysis: Serves as a reliable method for laboratories tasked with certifying product composition, ensuring methodologies withstand regulatory or contractual scrutiny.
Copper concentrates are complex materials containing a broad range of elements, including silver, gold, lead, arsenic, zinc, and others. Accurate silver determination through flame atomic absorption spectrometry, as facilitated by ASTM E1898-21, is vital to both economic evaluation and technological control in copper mining and metallurgy.
Related Standards
ASTM E1898-21 references and aligns with several other key ASTM standards to ensure accuracy and safety in chemical analysis, including:
- ASTM D1193: Specification for Reagent Water
- ASTM E29: Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
- ASTM E50: Practices for Apparatus, Reagents, and Safety Considerations for Chemical Analysis of Metals, Ores, and Related Materials
- ASTM E135: Terminology Relating to Analytical Chemistry for Metals, Ores, and Related Materials
- ASTM E882: Guide for Accountability and Quality Control in the Chemical Analysis Laboratory
- ASTM E1601: Practice for Conducting Interlaboratory Study to Evaluate the Performance of an Analytical Method
Adhering to these related standards in conjunction with ASTM E1898-21 ensures reliable, repeatable, and internationally recognized silver content determinations in copper concentrates.
Keywords: ASTM E1898-21, silver determination, copper concentrates, atomic absorption spectrometry, flame AAS, metallurgical analysis, compositional specifications, mineral processing, standard test method.
Технические детали
- Технический комитет
- E01 - Analytical Chemistry for Metals, Ores, and Related Materials
- SKU
- ASTM E1898-21
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