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Full Description

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:

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
Bismuthate Method Appendix X4
Periodate (Photometric) Method 27
pH Determination of Alkaline Earth Solutions 34
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,, X2.3.1, and X5.4.1.1.


Document History

  1. ASTM C25-11


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

    • Most Recent
  2. ASTM C25-06

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

    • Historical Version
  3. ASTM C25-99

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

    • Historical Version