ASTM-E1195:2008 Edition

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E1195-01(2008) Standard Test Method for Determining a Sorption Constant (K_oc) for an Organic Chemical in Soil and Sediments

Published By	Publication Date	Number of Pages
ASTM	2008	9

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Categories: 13.080.10 - Chemical characteristics of soils, ASTM

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Description

ASTM E1195-01-Reapproved2008

Withdrawn Standard: Standard Test Method for Determining a Sorption Constant (K_oc) for an Organic Chemical in Soil and Sediments (Withdrawn 2013)

ASTM E1195

Scope

1.1 This test method describes a procedure for determining the partitioning of organic chemicals between water and soil or sediment. The goal is to obtain a single value which can be used to predict partitioning under a variety of environmental conditions from the measurement of sorption coefficients for specific solids.

1.2 Sorption represents the binding process of chemicals to surfaces of soils or sediments through chemical, or physical, or both interactions.

1.3 The sorption of nonpolar organic chemicals, and to some extent polar organic chemicals, is correlated with the organic carbon content of the sorbing solid. Charged inorganic and organic molecules may behave differently, and some other property, such as, cation exchange capacity, clay content, or total surface area of sorbing solids, may influence sorption. Hydrous metal oxides of iron and aluminum may significantly affect sorption in sediments. In order to provide a sorption coefficient that is useful for a wide range of soils and sediments, the coefficient is based on organic carbon content. This approach, however, will not apply to all chemicals or all soils and sediments. In cases where it does not apply, the investigator may need to seek other methods of relating sorption to the properties of the chemical, soil, or sediment.

1.4 It is possible that, in addition to organic carbon, sorption is correlated with the total surface area of sorbing solids. This may be particularly important with solids having organic carbon contents so low that sorption to inorganic surfaces is significant in comparison to sorption by organic material. In such a case, inclusion of the total surface area into the sorption calculation may be useful. For further information on this subject see Ref (1).

1.5 Equilibrium sorption coefficients are determined. It is recognized that equilibrium conditions do not always exist in environmental situations, but sorption equilibria values are necessary for making generalizations about environmental partitioning.

1.6 Studies are conducted preferably with an analytical or technical-grade chemical. Mixtures are used only if analytical methods allow measurement of individual components of interest in the mixture. Good laboratory procedures must be followed to ensure validity of the data.

1.7 This standard does not purport to address all of the safety problems, 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.

Keywords

equilibrium sorption coefficients; partitioning of organic chemicals; sorption constant (K_oc); Carbon; Centrifuge method; Chemicals (environmental analysis); Environmental organic compounds; Environmental site assessment (ESA)–soil/rock; Equilibrium adsorption coefficient (Koc); Organic chemicals; Sediment; Soil sampling; Solid phase materials–waste; Solubility; Sorption capacity/rate; Surface analysis–soil/rock/related materials; Waste materials/processing/analysis

ICS Code

ICS Number Code 13.080.10 (Chemical characteristics of soil)

DOI: 10.1520/E1195-01R08

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents
2	Terminology Summary of Test Method Significance and Use Apparatus Reagents and Materials
3	Sampling, Test Specimens, and Test Units Procedure
4	Selection of Water to Solids Ratios FIG. 1
5	Calculation FIG. 2
6	Precision and Bias Keywords
7	X1. RANKING SORPTION TENDENCIES X1.1 X2. SOIL MOBILITY X2.1 TABLE 1 TABLE X1.1
8	X3. SORPTION EFFECTS ON VOLATILIZATION X3.1 X4. MATHEMATICAL MODELS FOR CHEMICAL FATE ESTIMATES X4.1 REFERENCES TABLE X2.1

Additional information

Standard Title	E1195-01(2008) Standard Test Method for Determining a Sorption Constant (K<sub>oc</sub>) for an Organic Chemical in Soil and Sediments
Published Code	ASTM
Publication Date	2008
Pages Count	9
ICS Codes	13.080.10 - Chemical characteristics of soils