ASTM D4373-21 PDF

1.1''This test method covers the determination of carbonate content of soils and soft rock which can be readily broken down by mechanical effort. It is a gasometric method that uses a simple portable apparatus. Results should be clearly stated as the calcite equivalent in percent because different carbonate species cover a wide range of percent calcite equivalent as shown below for a number of carbonates:

Species

Cation

Calcite
Equivalent, %

Magnesite

Mg

117.0

Dolomite

Ca, Mg

108.6

Calcite

Ca

100.0

Aragonite

Ca

100.0

Rhodocrosite

Mn

87.1

Siderite

Fe

86.4

Smithsonite

Zn

79.8

Witherite

Ba

50.7

Cerrusite

Pb

37.5

For example, a 100'''% dolomite would be expected to yield 108.6'''% calcite equivalent while 100'''% siderite would yield only 86.4'''% calcite equivalent. Calcite and aragonite reactions will typically complete within about 10 minutes. This method does not distinguish between the carbonate species and such determination must be made using quantitative chemical analysis methods such as atomic absorption.

1.2''Units'''The values stated in SI units are to be regarded as standard. The values given in parentheses are provided for information only and are not considered standard. Reporting of test results in units other than SI shall not be regarded as nonconformance with this standard

1.3''All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026.

1.3.1''The procedures used to specify how data are collected/recorded or calculated, in this standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained. The procedures used do not consider material variation, purpose for obtaining the data, special purpose studies, or any considerations for the user's objectives; and it is common practice to increase or reduce significant digits of reported data to be commensurate with these considerations. It is beyond the scope of this standard to consider significant digits used in analytical methods for engineering design.

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.

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.