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Standard Test Method for Distribution Coefficients of Inorganic Species by the Batch Method
Automaticky přeložený název:
Standardní zkušební metoda pro distribučních koeficientů anorganických druhů metodou Batch
NORMA vydána dne 1.10.2010
Označení normy: ASTM C1733-10
Poznámka: NEPLATNÁ
Datum vydání normy: 1.10.2010
Kód zboží: NS-12336
Počet stran: 8
Přibližná hmotnost: 24 g (0.05 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
adsorption, attenuation, batch sorption, distribution coefficient, geochemical, ground water, ion exchange capacity, isotherm, liquid migration, short-term batch, ICS Number Code 13.080.99 (Other standards related to soil quality), 71.040.40 (Chemical analysis)
Significance and Use | ||||||||||||||||
The distribution coefficient,
Kd, is an experimentally
determined ratio quantifying the distribution of a chemical species
between a given fluid and geomedium sample under certain
conditions, including the attainment of constant aqueous
concentrations of the species of interest. The Kd concept is used in mass transport
modeling, for example, to assess the degree to which the movement
of a species will be delayed by interactions with the geomedium as
the solution migrates through the geosphere under a given set of
underground geochemical conditions (pH, temperature, ionic
strength, etc.). The retardation factor (Rf) is the ratio of the velocity of the
groundwater divided by the velocity of the contaminant, which can
be expressed as: |
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1. Scope | ||||||||||||||||
1.1 This test method covers the determination of distribution coefficients of chemical species to quantify uptake onto solid materials by a batch sorption technique. It is a laboratory method primarily intended to assess sorption of dissolved ionic species subject to migration through pores and interstices of site specific geomedia. It may also be applied to other materials such as manufactured adsorption media and construction materials. Application of the results to long-term field behavior is not addressed in this method. Distribution coefficients for radionuclides in selected geomedia are commonly determined for the purpose of assessing potential migratory behavior of contaminants in the subsurface of contaminated sites and waste disposal facilities. This test method is also applicable to studies for parametric studies of the variables and mechanisms which contribute to the measured distribution coefficient. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 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. |
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2. Referenced Documents | ||||||||||||||||
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