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    ASTM E2941 - 21

    Standard Practices for Extraction of Elements from Ores and Related Metallurgical Materials by Acid Digestion

    Active Standard ASTM E2941 | Developed by Subcommittee: E01.02

    Book of Standards Volume: 03.05

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    Significance and Use

    4.1 These practices are primarily intended to test materials for compliance with compositional specifications and for monitoring. Partial extraction of ores and related metallurgical materials can provide information on the availability of elements to leaching, water quality changes, or other site conditions.

    4.2 It is assumed that the users of these practices will be trained analysts capable of performing common laboratory procedures 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 such as those described in Guide E882 shall be followed.

    1. Scope

    1.1 These practices cover the digestion of ores and related metallurgical materials, such as mine soil, waste rock and tailings, for subsequent determination of acid-extractable contents of certain elements by such solution analytical techniques as atomic absorption spectrometry (AAS), inductively coupled plasma atomic emission spectrometry (ICP-AES) (see Test Method D1976), and inductively coupled plasma mass spectrometry (ICP-MS) (see Test Method D5673).

    1.1.1 Contents of aluminum, antimony, arsenic, barium, beryllium, bismuth, boron, cadmium, calcium, chromium, cobalt, copper, gallium, iron, lead, lithium, magnesium, manganese, mercury, molybdenum, nickel, phosphorus, potassium, scandium, selenium, silver, sodium, strontium, thallium, tin, titanium, vanadium and zinc can be extracted from ores and related metallurgical materials for determination by analytical methods for elements in solution. Other elements may be determined from extracts produced using this practice.

    1.1.2 Actual element quantification in digested solutions can be accomplished by following the various test methods under other appropriate ASTM standards for element(s) of interest in solution.

    1.1.3 The detection limit and linear content range for each element is dependent on the atomic absorption, mass spectrometry or emission spectrometric technique employed and may be found in the manual accompanying the instrument used or ASTM standard method for analysis of the solutions. Consider the dilution factor in content calculations due to digestion and dilution of solid samples.

    1.1.4 The extent of extraction of elements from ores and related metallurgical materials by these practices is dependent upon the physical and mineralogical characteristics of the prepared sample and the digestion practice used.

    1.2 The digestion practices appear in the following order:



    Nitric Acid Microwave Digestion

    7 to 14

    Four-Acid Total Digestion

    15 to 21

    1.3 The values stated SI units are to be regarded as the standard. No other units of measurements are included in this standard.

    1.4 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. For specific hazard statements, see Sections 11 and 20.

    1.5 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.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    Federal Standard

    CFR Title 21, Part 1030, and Title 47, Part 18

    ASTM Standards

    D1193 Specification for Reagent Water

    D1976 Test Method for Elements in Water by Inductively-Coupled Plasma Atomic Emission Spectroscopy

    D5258 Practice for Acid-Extraction of Elements from Sediments Using Closed Vessel Microwave Heating

    D5673 Test Method for Elements in Water by Inductively Coupled PlasmaMass Spectrometry

    E50 Practices for Apparatus, Reagents, and Safety Considerations for Chemical Analysis of Metals, Ores, and Related Materials

    E135 Terminology Relating to Analytical Chemistry for Metals, Ores, and Related Materials

    E882 Guide for Accountability and Quality Control in the Chemical Analysis Laboratory

    ICS Code

    ICS Number Code 73.060.01 (Metalliferrous minerals and their concentrates in general)

    UNSPSC Code

    UNSPSC Code 11101600(Ores)

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/E2941-21

    Citation Format

    ASTM E2941-21, Standard Practices for Extraction of Elements from Ores and Related Metallurgical Materials by Acid Digestion, ASTM International, West Conshohocken, PA, 2021, www.astm.org

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