ASTM C25 - 11

    Standard Test Methods for Chemical Analysis of Limestone, Quicklime, and Hydrated Lime

    Active Standard ASTM C25 | Developed by Subcommittee: C07.05

    Book of Standards Volume: 04.01


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    Significance and Use

    These test methods provide accurate and reliable analytical procedures to determine the chemical constituents of limestone, quicklime, and hydrated lime (See Note 1). The percentages of specific constituents which determine a material's quality or fitness for use are of significance depending upon the purpose or end use of the material. Results obtained may be used in relation to specification requirements.

    Because quicklime and hydrated lime quickly absorb water and carbon dioxide from the air, precision and bias are extremely dependent upon precautions taken during sample preparation and analysis to minimize excessive exposure to ambient conditions.

    Note 1—These test methods can be applied to other calcareous materials if provisions are made to compensate for known interferences.

    1. Scope

    1.1 These test methods cover the chemical analysis of high-calcium and dolomitic limestone, quicklime, and hydrated lime. These test methods are classified as either standard (preferred) or alternative (optional).

    1.2 The standard test methods are those that employ classical gravimetric or volumetric analytical procedures and are typically those required for referee analyses where chemical specification requirements are an essential part of contractual agreement between buyer and seller.

    1.3 Alternative or optional test methods are provided for those who wish to use procedures shorter or more convenient than the standard methods for the routine determinations of certain constituents. Optional test methods may sometimes be preferred to the standard test methods, but frequently the use of modern and expensive instrumentation is indicated which may not be accessible to everyone. Therefore, the use of these test methods must be left to the discretion of each laboratory.

    1.4 The analytical procedures appear in the following order:

    Section
    Aluminum Oxide 15
    Available Lime Index 28
    Calcium and Magnesium Oxide:
    Alternative EDTA Titration Method 31
    Calcium Carbonate Equivalent 33
    Calcium Oxide:
    Gravimetric Method 16
    Volumetric Method 17
    Carbon Dioxide by Standard Method 22
    Combined Oxides of Iron and Aluminum 12
    Ferrous Iron Appendix X5
    Free Calcium Oxide Appendix X6
    Free Moisture in Hydrated Lime 21
    Free Moisture in Limestone 20
    Free Silica 29
    Insoluble Matter Including Silicon Dioxide:
    Standard Method 8
    Optional Perchloric Acid Method 9
    Insoluble Matter Other Than Silicon Dioxide 11
    Loss on Ignition 19
    Magnesium Oxide 18
    Manganese:
    Bismuthate Method Appendix X4
    Periodate (Photometric) Method 27
    pH Determination of Alkaline Earth Solutions 34
    Phosphorus:
    Titrimetric Method Appendix X3
    Molybdovanadate Method 26
    Silicon Dioxide 10
    Strontium Oxide Appendix X2
    Sulfur Trioxide 23
    Total Carbon:
    Direct Combustion-Thermal Conductivity Cell Method32
    Total Carbon and Sulfur:
    Combustion/Infrared Detection Method 35
    Total Iron:
    Standard Method, Potassium Dichromate Titration 13
    Potassium Permanganate Titration Method Appendix X1
    Ortho-Phenanthroline, Photometric Method 14
    Total Sulfur:
    Sodium Carbonate Fusion 24
    Combustion-Iodate Titration Method 25
    Unhydrated Oxides 30

    1.5 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 and health practices and determine the applicability of regulatory limitations prior to use. For specific precautionary statements, see 9.3, 10.2.1, 18.4.3, 31.6.4.2, X2.3.1, and X5.4.1.1.


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

    ASTM Standards

    C50 Practice for Sampling, Sample Preparation, Packaging, and Marking of Lime and Limestone Products

    C51 Terminology Relating to Lime and Limestone (as used by the Industry)

    C911 Specification for Quicklime, Hydrated Lime, and Limestone for Selected Chemical and Industrial Uses

    D1193 Specification for Reagent Water

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

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

    E70 Test Method for pH of Aqueous Solutions With the Glass Electrode

    E173 Practice for Conducting Interlaboratory Studies of Methods for Chemical Analysis of Metals

    E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods

    E200 Practice for Preparation, Standardization, and Storage of Standard and Reagent Solutions for Chemical Analysis

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

    E832 Specification for Laboratory Filter Papers


    ICS Code

    ICS Number Code 91.100.10 (Cement. Gypsum. Lime. Mortar)

    UNSPSC Code

    UNSPSC Code 11111608(Limestone); 30111604(Hydrated lime)


    DOI: 10.1520/C0025-11

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