ASTM C1733-2017a 采用分批处理法测定无机物种分布系数的标准试验方法标准

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标准号: ASTM C1733-2017a
发布日期: 2017年
实施日期
废止日期: 无
中国标准分类号: G10
国际标准分类号: 13.080.99 ; 71.040.40
发布单位: US-ASTM

适用范围

4.1x00a0;The distribution coefficient, K_d, is an experimentally determined ratio quantifying the distribution of a chemical species between a given fluid and solid material sample under certain conditions, including the attainment of constant aqueous concentrations of the species of interest. The K_d 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 local geomedium as the solution migrates through the geosphere under a given set of underground geochemical conditions (pH, temperature, ionic strength, etc.). The retardation factor (R_f) is the ratio of the velocity of the groundwater divided by the velocity of the contaminant, which can be expressed as:

Equation C1733-17A_3

where:
x03c1;_b	x00a0;x00a0;=x00a0;x00a0;	bulk density of the porous medium (mass/length³) and
x03b7;_e	x00a0;x00a0;=x00a0;x00a0;	effective porosity of the medium (unitless) expressed as a decimal.

4.2x00a0;Because of the sensitivity of K_d to site specific conditions and materials, the use of literature derived K_d values is strongly discouraged. For applications other than transport modeling, batch K_d measurements also may be used, for example, for parametric studies of the effects of changing chemical conditions and of mechanisms related to the interactions of fluids with solid material.

1.1x00a0;This test method covers the determination of distribution coefficients, K_d, 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, or other solid material. 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. K_d for radionuclides in selected geomedia or other solid materials are commonly determined for the purpose of assessing potential migratory behavior of contaminants in the subsurface of contaminated sites and out of a waste form and in the surface of waste disposal facilities. This test method is also applicable to studies for parametric studies of the variables and mechanisms which contribute to the measured

ASTM C1733-2017a采用分批处理法测定无机物种分布系数的标准试验方法

Standard Test Method for Distribution Coefficients of Inorganic Species by the Batch Method

ASTM C1733-2017a
采用分批处理法测定无机物种分布系数的标准试验方法