Adsorptive displacement from activated carbon: recovery of 4,4'-dichlorobiphenyl
Adsorptive displacement, which has been proposed for determining multiple trace refractory adsorbates on activated carbon, was applied to 4,4'-dichlorobiphenyl (DCB) (a model compound for polychlorinated biphenyls). The adsorption of DCB was first determined in cyclohexane and in toluene (a weakly and a strongly displacing solvent) and then in each solvent with added (concentrated) naphthalene as a displacer; all loadings were in the milligram per gram range. Cyclohexane gave no detectable extraction, and toluene showed a significantly nonlinear isotherm. By contrast, linear isotherms were observed in both solvents with added naphthalene; this linearity makes it possible to analyze for trace DCB in these systems. The adsorptive displacement method was tested by shaking preloaded carbon samples (0.77-3.16mg/g) with naphthalene-toluene (100g/L), followed by determination of DCB in the equilibrium solution. The average deviation between known and determined loadings was +/-5%.
- Research Organization:
- Kent State Univ., OH
- OSTI ID:
- 7141924
- Journal Information:
- Environ. Sci. Technol.; (United States), Vol. 18:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
CHLORINATED AROMATIC HYDROCARBONS
QUANTITATIVE CHEMICAL ANALYSIS
SOLVENT EXTRACTION
ACTIVATED CARBON
ADSORPTION
ADSORPTION ISOTHERMS
CALCULATION METHODS
COMPARATIVE EVALUATIONS
SOLVENTS
TRACE AMOUNTS
ADSORBENTS
AROMATICS
CARBON
CHEMICAL ANALYSIS
ELEMENTS
EXTRACTION
HALOGENATED AROMATIC HYDROCARBONS
ISOTHERM
NONMETALS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
SEPARATION PROCESSES
SORPTION
400105* - Separation Procedures
500200 - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)