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ASTM C25 - 11

Standard testing methods for the chemical analysis of limestone, lime

quicklime and hydrated lime
Active C25 ASTM Standard | Developed by Subcommittee: C07.05
Volume Norms Book: 04.01

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MORE RULES C07.05 RELATED PRODUCTS STANDARD REFERENCES FIND LABORATORIES
Importance and Use
4.1 These testing methods provide accurate and reliable analytical procedures to determine the components
chemicals from limestone, quicklime, and hydrated lime (See Note 1). The percentages of the specific components that
the quality or suitability of the material for its use is important depending on the purpose or end use of the
material. The results obtained can be used in relation to the specification requirements.
4.2 Due to quick absorption of water and carbon dioxide from the air by quicklime and hydrated lime, the accuracy and the
bias is extremely dependent on the precautions taken during the preparation and analysis of the sample for
minimize excessive exposure to environmental conditions.
NOTE 1: These testing methods can be applied to other calcareous materials if arrangements are made to
compensate for known interferences.
1. Scope
1.1 These test methods cover the chemical analysis of high calcium content and dolomitic limestone, quicklime, and
hydrated lime. These testing methods are classified as standard (preferred) or alternative (optional).
1.2 Standard test methods are those that use classic gravimetric or volumetric analysis procedures.
and are typically those required for collegiate analyses where the chemical specification requirements are part of it
essential of the contractual agreement between the buyer and the seller.

1.3 Alternative or optional testing methods are provided for those who wish to use more procedures.
shorter or more convenient than the reference methods for the routine analysis of certain components. Methods
optional tests can sometimes be preferable to standard testing methods, but frequently the use of
modern and expensive instruments are indicated to be not accessible to everyone. Therefore, the use of these methods of
The trial should be left to the discretion of each laboratory.

1.4 The analysis procedures appear in the following order:

Section
Aluminum oxide 15
Available Lime Index 28
Calcium and magnesium oxide:
EDTA alternative titration method 31
Calcium carbonate equivalent 33
Calcium oxide:
Gravimetric method 16
Volumetric method 17
Carbon Dioxide by the 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 humidity in Limestone 20
Free silica 29
Insoluble materials including silicon dioxide:
Standard Method 8
Optional perchloric acid method 9
Insoluble ELEMENTS THAT DO NOT Silicon Dioxide 11
Loss by ignition 19
Magnesium oxide 18
Manganese:
Bismuth method Appendix X4
Photometric Method 27
Determination of pH alkaline Earth Solutions 34
Phosphorus
Volumetric method Appendix X3
Vanadomolybdic method 26
Silicon dioxide 10
Strontium oxide Appendix X2
Sulfur trioxide 23
Total Carbon:
 Cell conductivity method - direct thermal combustion 32
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
Non-hydrated Oxides 30
1.5 This standard does not intend to consider all safety issues, if any, associated with its use. It is
user responsibility of this standard to establish safety and health practices and determine the applicability of the
limitations regulatory before of his use. For the advice of prudence specific
ver 9.3 , 10.2.1 , 18.4.3 , 31.6.4.2 , X2. 3.1 , y X5.4.1.1 .

2. Reference documents (separate purchase)

ASTM Standards

C50 Methodology for sampling, sample preparation, packaging, and labeling of lime and limestone products
C51 Terminology related to lime and limestone (used by the industry)
C911 Specification for quicklime, hydrated lime, and limestone for Selected and Industrial Chemical Uses
D1193 Specification for Water Reagent
E29 Practices for the Use of Significant Digits in Test Data to Determine Conformance with Specifications
E50 Practices for equipment, reagents, and safety considerations for the chemical analysis of Metals, Minerals and
Related Materials
E70 Test method for pH of aqueous solutions using a glass electrode
E173 Practices for conducting interlaboratory studies of chemical analysis methods for metals
E177 Practices for the Use of Terms Precision and Bias in ASTM Testing Methods
E200 Practices for the Preparation, Standardization, and Storage of Standards and Reagent Solutions for Analysis
chemicals
E691 Practices for conducting a study among laboratories to determine the accuracy of a testing method
E832 Specifications for Laboratory Document Filtering
Keywords
Chemical Composition - - Chemical Analysis of Dolomitic Limestone - Gravimetry - High Calcium Limestone - Hydrated Lime - The
live cal
ICS Code
Code Number ICS 91.100.10 (Cement. Gypsum. Lime. Mortar)
UNSPSC Code
Código UNSPSC 11111608 (piedra caliza); 30111604 (cal hidratada)
Refer to this Standard
10.1520/C0025-11

ASTM International is a member of CrossRef.

Citation format
ASTM C25-11, Standard test methods for chemical analysis of limestone, quicklime, and hydrated lime, ASTM
International, West Conshohocken, PA, 2011, www.astm.org