Long-term sorption of halogenated organic chemicals by aquifer material. 2. Intraparticle diffusion
- Duke Univ., Durham, NC (United States)
- Stanford Univ., CA (United States)
The rate of sorptive uptake of tetrachloroethene (PCE) and 1,2,4,5-tetrachlorobenzene (TeCB) was studied on sandy aquifer material from Borden, ON, by use of a batch methodology designed to accurately measure sorption over long equilibration periods. Measured rates of uptake were interpreted with an intraparticle diffusion model and diffusive rate constants were determined for different size fractions of the Borden solids as well as with pulverized material. In general, measured rates were quite slow in comparison with previously reported results in other systems. The rate constants for TeCB were consistently lower than for PCE, with inverse correlation between observed rate constants and equilibrium distribution coefficients, consistent with a concept of retarded intraparticle diffusion. Good model fits with the coarsest size fractions and dramatic increases in rate with particle pulverization suggest that sorption occurs throughout the grain volume and that particle radius may be the appropriate length scale for diffusion. Based on measured particle size and independent estimates of porosity and internal retardation, effective pore diffusion coefficients are estimated to be roughly 2-3 orders of magnitude lower than bulk aqueous diffusivities, consistent with the low porosity of the calcareous rock fragments studied and an additional 3- to 20-fold rate reduction due to constrictive effects of pore size. Interpretations of results assuming intraorganic matter diffusion are also presented and discussed. 57 refs.
- OSTI ID:
- 5456319
- Journal Information:
- Environmental Science and Technology; (United States), Journal Name: Environmental Science and Technology; (United States) Vol. 25:7; ISSN ESTHA; ISSN 0013-936X
- Country of Publication:
- United States
- Language:
- English
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Long-term sorption of halogenated organic chemicals by aquifer material. 1. Equilibrium
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Related Subjects
540220* -- Environment
Terrestrial-- Chemicals Monitoring & Transport-- (1990-)
540320 -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
ADSORPTION
AQUIFERS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CANADA
CARBON 14
CARBON ISOTOPES
CHLORINATED ALIPHATIC HYDROCARBONS
COMMINUTION
DATA
DATA ANALYSIS
DEVELOPED COUNTRIES
DIFFUSION
ENVIRONMENTAL TRANSPORT
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
FLOW MODELS
HALOGENATED ALIPHATIC HYDROCARBONS
INFORMATION
ISOTOPES
LABELLED COMPOUNDS
LIGHT NUCLEI
MASS TRANSFER
MATHEMATICAL MODELS
NORTH AMERICA
NUCLEI
NUMERICAL DATA
ONTARIO
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PARTICLE SIZE
POROSITY
RADIOISOTOPES
RESERVOIR ROCK
SAND
SIZE
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
YEARS LIVING RADIOISOTOPES