Time-Dependent Interfacial Properties and DNAPL Mobility

Journal Article · Wed Mar 10 04:00:00 EST 1999 · Journal of Geophysical Research

OSTI ID:4979

Tuck, D M

Interfacial properties play a major role in governing where and how dense nonaqueous phase liquids (DNAPLs) move in the subsurface. Interfacial tension and contact angle measurements were obtained for a simple, single component DNAPL (tetrachloroethene, PCE), complex laboratory DNAPLs (PCE plus Sudan IV dye), and a field DNAPL from the Savannah River Site (SRS) M-Area DNAPL (PCE, trichloroethene [TCE], and maching oils). Interfacial properties for complex DNAPLs were time-dependent, a phenomenon not observed for PCE alone. Drainage capillary pressure-saturation curves are strongly influenced by interfacial properties. Therefore time-dependence will alter the nature of DNAPL migration and penetration. Results indicate that the time-dependence of PCE with relatively high Sudan IV dye concentrations is comparable to that of the field DNAPL. Previous DNAPL mobility experiments in which the DNAPL was dyed should be reviewed to determine whether time-dependent properties influenced the resutls. Dyes appear to make DNAPL more complex, and therefore a more realistic analog for field DNAPLs than single component DNAPLs.

• Research Organization: Savannah River Site
• Sponsoring Organization: DOE
• DOE Contract Number: AC09-96SR18500
• OSTI ID: 4979
• Report Number(s): WSRC-MS-99-00139
• Journal Information: Journal of Geophysical Research, Journal Name: Journal of Geophysical Research
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
Dyes
Interfaces
Mobility
Nonaqueous Solvents
Time Dependence