Abstract:

Measurements of effectiveness of model dispersants. Includes lab data and image data. Dataset supporting the publication "The role of dispersants’ dynamic interfacial tension in effective crude oil spill dispersion", Marine Pollution Bulletin 84 (2014) 155–163, http://dx.doi.org/10.1016/j.marpolbul.2014.05.018 The dispersion effectiveness of dispersants containing Tween 80, Span 80, and dioctyl sodium sulfosuccinate (DOSS) was characterized using a modified Swirling Flask test, and was correlated with both initial and dynamic interfacial tension produced by those dispersants at an oil–water interface. Compositional trends in effectiveness were shown to be governed by: (1) initial oil–water interfacial tension observed upon dispersant–oil–saltwater contact; (2) rate of increase (or decrease) from the initial interfacial tension as DOSS was rapidly lost to the aqueous phase; and (3) gradually slowing kinetics of dispersant adsorption to the oil–water interface as Span 80 concentration was increased, which ultimately diminished dispersion effectiveness considerably even as dynamic interfacial tension remained less than 10−3 mN/m. It is proposed that this third phenomenon results not only from the hydrophobicity of Span 80, but also from the dependence of mixed Tween–Span–DOSS reverse micelles’ stability in crude oil on dispersant composition.

Suggested Citation:

Alon McCormick, David Riehm. 2014. Dataset for: The role of dispersants’ dynamic interfacial tension in effective crude oil spill dispersion.. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N7B56GQQ

Publications:

Riehm, D. A., & McCormick, A. V. (2014). The role of dispersants’ dynamic interfacial tension in effective crude oil spill dispersion. Marine Pollution Bulletin, 84(1-2), 155–163. doi:10.1016/j.marpolbul.2014.05.018

Purpose:

The aim of this work is to elucidate the relative influences of initial interfacial tension and of dynamic changes in interfacial tension on the dispersion effectiveness of mixtures of sorbitan monooleate (Span 80), (PEO)20 sorbitan monooleate (Tween 80), and dioctyl sodium sulfosuccinate (DOSS).

Data Parameters and Units:

Effectiveness Data Notes.txt Effectiveness Data xlsx files-- (filenames list the %weights and then names of the dispersant composition): Test Setup, Wavelength, Sample Absorbance, 100% Calibrated Absorbance, Effectiveness. Tensiometry Data Notes.txt Tensiometry Data xlsx files-- Date (MM-DD-YY), Time (minutes), Mag. (x or ratio height of image/height of object), Speed (RPM), Apparent Diameter (marks), Actual Diameter (mm), Interfacial Tension (dynes/cm^2), Average Observed Interfacial Tension IFT (dynes/cm^2), Standard Deviation of Observed Interfacial Tension IFT (dynes/cm^2), Droplet volume (mu-L) is calculated at the bottom of the spreadsheet. Tensiometry Video Notes.txt Tensiometry Videos mp3 files--(filenames give the Tensiometry Data Date (MM-DD-YY), list the %weights and then names of the dispersant composition, and give the original VHS tape Time e.g., 6m 15s means 6 minutes 15 seconds). The digitized mp3 files did not drop frames and have equivalent recording length as the original VHS recordings. Data Summary.xlsx-- Summary Figures 3 and 6, Calibration Curve, Volume Comparison Figure 5 left, Rate of Interfacial Tension IFT Decline Figure 5 right. Locations of Data found in Figures.txt--key for finding the data that produced the journal article figures.

Individual Files: