The Experts below are selected from a list of 534 Experts worldwide ranked by ideXlab platform
Ram B Gupta - One of the best experts on this subject based on the ideXlab platform.
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Surfactant-Loaded Halloysite Clay Nanotube Dispersants for Crude Oil Spill Remediation
2015Co-Authors: Emmanuel Nyankson, Owoseni Olasehinde, Vijay T. John, Ram B GuptaAbstract:The toxicity of oil spill dispersants could be greatly reduced by using environmentally benign materials as surfactant-carrier. In this work, we report halloysite clay nanotubes (HNTs) loaded with different surfactants for crude oil spill remediation. The effectiveness of HNT loaded with the surfactants Tween 80, Dioctyl Sodium Sulfosuccinate (DOSS, D), Span 80 (S) and modified soybean lecithin phosphatidylinositol (Lecithin FPI, LFPI) in crude oil spill remediation was examined with the U.S. EPA’s baffled flask test. The release kinetics of the surfactants from the HNT were studied. Ternary diagrams (Span 80–DOSS–Tween 80, Lecithin FPI–DOSS–Tween 80 and Lecithin FPI–Tween 80–Span 80) for the dispersion effectiveness of the surfactant-loaded HNT were then generated. 99 vol % dispersion effectiveness was attained by HNT loaded with ternary food grade surfactants Span 80, Tween 80 and Lecithin FPI. An environmentally friendly oil spill dispersant was therefore formulated using naturally occurring HNT and FDA approved food grade surfactants
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comparison of the effectiveness of solid and solubilized Dioctyl Sodium Sulfosuccinate doss on oil dispersion using the baffled flask test for crude oil spill applications
Industrial & Engineering Chemistry Research, 2014Co-Authors: Emmanuel Nyankson, Courtney A Ober, Matthew J Decuir, Ram B GuptaAbstract:The accidental release of natural crude oil into our marine waters and its subsequent effect on the environment is one of the major problems that the environmental protection agencies and coast guards of most countries worldwide have to deal with. In this study, the effectiveness on oil dispersions of a composite particle made of paraffin wax and the surfactant Dioctyl Sodium Sulfosuccinate (DOSS) was compared to that of the same DOSS dissolved in a liquid solvent using the U.S. EPA’s baffled flask procedure. Solid dispersant composite particles were prepared by ultrasonically spray freezing paraffin wax and DOSS molten solution while varying the mass ratio. The amount of DOSS in the composite particle was determined by the methylene blue complexation procedure. Liquid delivery of DOSS was accomplished by dissolving the surfactant in propylene glycol (PG). The results from the study showed that the dispersion effectiveness of the DOSS–paraffin wax composite particles were dependent on particle size, the s...
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Comparison of the Effectiveness of Solid and Solubilized Dioctyl Sodium Sulfosuccinate (DOSS) on Oil Dispersion Using the Baffled Flask Test, for Crude Oil Spill Applications
2014Co-Authors: Emmanuel Nyankson, Matthew J Decuir, Courtney A. Ober, Ram B GuptaAbstract:The accidental release of natural crude oil into our marine waters and its subsequent effect on the environment is one of the major problems that the environmental protection agencies and coast guards of most countries worldwide have to deal with. In this study, the effectiveness on oil dispersions of a composite particle made of paraffin wax and the surfactant Dioctyl Sodium Sulfosuccinate (DOSS) was compared to that of the same DOSS dissolved in a liquid solvent using the U.S. EPA’s baffled flask procedure. Solid dispersant composite particles were prepared by ultrasonically spray freezing paraffin wax and DOSS molten solution while varying the mass ratio. The amount of DOSS in the composite particle was determined by the methylene blue complexation procedure. Liquid delivery of DOSS was accomplished by dissolving the surfactant in propylene glycol (PG). The results from the study showed that the dispersion effectiveness of the DOSS–paraffin wax composite particles were dependent on particle size, the solubility of the matrix material (paraffin wax) in the crude oil, and the DOSS-to-oil ratio (DOR, mg/g). This is because the paraffin wax would have to dissolve in the crude oil to release DOSS, which is then used for the dispersion of the crude oil. At 23 mg/g DOR, which was the maximum DOR used in the study, the dispersion effectiveness of the dispersant composite particles was 60 vol % and 62.6 vol % in the heavy Texas crude (TC) and the light crude (LC) oils, respectively. The dispersion effectiveness of the solubilized DOSS on TC was significantly higher than that of the dispersant composite particles; however, at DOR of 23 mg/g, the effectiveness of the dispersant composite particles on LC was just 1.8 vol % below that of the solubilized DOSS. There was a significant increase in the dispersion effectiveness when the mixing energy was increased from 150 to 200 rpm (rpm); nevertheless, the effectiveness was almost the same at 200 and 250 rpm. Dispersion effectiveness was analyzed at different salinity environments, that is, in brackish water (1.6 and 2.8 wt % salt concentration) and saline water (3.5 wt % salt concentration). The dispersant composite particles performed better at low salinities; however, the dispersion effectiveness almost leveled off at 2.8 and 3.5 wt % salt concentrations. The results of this study show the potential of dispersant composite particles to replace solubilized dispersants in oil spill remediation in the near future and, as a result, eliminate the environmental complications associated with the use of solvents in formulating traditional liquid dispersants
Emmanuel Nyankson - One of the best experts on this subject based on the ideXlab platform.
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Surfactant-Loaded Halloysite Clay Nanotube Dispersants for Crude Oil Spill Remediation
2015Co-Authors: Emmanuel Nyankson, Owoseni Olasehinde, Vijay T. John, Ram B GuptaAbstract:The toxicity of oil spill dispersants could be greatly reduced by using environmentally benign materials as surfactant-carrier. In this work, we report halloysite clay nanotubes (HNTs) loaded with different surfactants for crude oil spill remediation. The effectiveness of HNT loaded with the surfactants Tween 80, Dioctyl Sodium Sulfosuccinate (DOSS, D), Span 80 (S) and modified soybean lecithin phosphatidylinositol (Lecithin FPI, LFPI) in crude oil spill remediation was examined with the U.S. EPA’s baffled flask test. The release kinetics of the surfactants from the HNT were studied. Ternary diagrams (Span 80–DOSS–Tween 80, Lecithin FPI–DOSS–Tween 80 and Lecithin FPI–Tween 80–Span 80) for the dispersion effectiveness of the surfactant-loaded HNT were then generated. 99 vol % dispersion effectiveness was attained by HNT loaded with ternary food grade surfactants Span 80, Tween 80 and Lecithin FPI. An environmentally friendly oil spill dispersant was therefore formulated using naturally occurring HNT and FDA approved food grade surfactants
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comparison of the effectiveness of solid and solubilized Dioctyl Sodium Sulfosuccinate doss on oil dispersion using the baffled flask test for crude oil spill applications
Industrial & Engineering Chemistry Research, 2014Co-Authors: Emmanuel Nyankson, Courtney A Ober, Matthew J Decuir, Ram B GuptaAbstract:The accidental release of natural crude oil into our marine waters and its subsequent effect on the environment is one of the major problems that the environmental protection agencies and coast guards of most countries worldwide have to deal with. In this study, the effectiveness on oil dispersions of a composite particle made of paraffin wax and the surfactant Dioctyl Sodium Sulfosuccinate (DOSS) was compared to that of the same DOSS dissolved in a liquid solvent using the U.S. EPA’s baffled flask procedure. Solid dispersant composite particles were prepared by ultrasonically spray freezing paraffin wax and DOSS molten solution while varying the mass ratio. The amount of DOSS in the composite particle was determined by the methylene blue complexation procedure. Liquid delivery of DOSS was accomplished by dissolving the surfactant in propylene glycol (PG). The results from the study showed that the dispersion effectiveness of the DOSS–paraffin wax composite particles were dependent on particle size, the s...
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Comparison of the Effectiveness of Solid and Solubilized Dioctyl Sodium Sulfosuccinate (DOSS) on Oil Dispersion Using the Baffled Flask Test, for Crude Oil Spill Applications
2014Co-Authors: Emmanuel Nyankson, Matthew J Decuir, Courtney A. Ober, Ram B GuptaAbstract:The accidental release of natural crude oil into our marine waters and its subsequent effect on the environment is one of the major problems that the environmental protection agencies and coast guards of most countries worldwide have to deal with. In this study, the effectiveness on oil dispersions of a composite particle made of paraffin wax and the surfactant Dioctyl Sodium Sulfosuccinate (DOSS) was compared to that of the same DOSS dissolved in a liquid solvent using the U.S. EPA’s baffled flask procedure. Solid dispersant composite particles were prepared by ultrasonically spray freezing paraffin wax and DOSS molten solution while varying the mass ratio. The amount of DOSS in the composite particle was determined by the methylene blue complexation procedure. Liquid delivery of DOSS was accomplished by dissolving the surfactant in propylene glycol (PG). The results from the study showed that the dispersion effectiveness of the DOSS–paraffin wax composite particles were dependent on particle size, the solubility of the matrix material (paraffin wax) in the crude oil, and the DOSS-to-oil ratio (DOR, mg/g). This is because the paraffin wax would have to dissolve in the crude oil to release DOSS, which is then used for the dispersion of the crude oil. At 23 mg/g DOR, which was the maximum DOR used in the study, the dispersion effectiveness of the dispersant composite particles was 60 vol % and 62.6 vol % in the heavy Texas crude (TC) and the light crude (LC) oils, respectively. The dispersion effectiveness of the solubilized DOSS on TC was significantly higher than that of the dispersant composite particles; however, at DOR of 23 mg/g, the effectiveness of the dispersant composite particles on LC was just 1.8 vol % below that of the solubilized DOSS. There was a significant increase in the dispersion effectiveness when the mixing energy was increased from 150 to 200 rpm (rpm); nevertheless, the effectiveness was almost the same at 200 and 250 rpm. Dispersion effectiveness was analyzed at different salinity environments, that is, in brackish water (1.6 and 2.8 wt % salt concentration) and saline water (3.5 wt % salt concentration). The dispersant composite particles performed better at low salinities; however, the dispersion effectiveness almost leveled off at 2.8 and 3.5 wt % salt concentrations. The results of this study show the potential of dispersant composite particles to replace solubilized dispersants in oil spill remediation in the near future and, as a result, eliminate the environmental complications associated with the use of solvents in formulating traditional liquid dispersants
G Mckinney - One of the best experts on this subject based on the ideXlab platform.
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three generation reproduction study with Dioctyl Sodium Sulfosuccinate in rats
Toxicological Sciences, 1990Co-Authors: K Mackenzie, Richard A Davis, S Henwood, G Foster, F Akin, Peter J Debaecke, G Sisson, G MckinneyAbstract:Abstract Groups of 30 male and 30 female rats (F0) were fed diets containing 0, 0.1, 0.5, or 1.0% Dioctyl Sodium Sulfosuccinate (DSS) for 10 and 2 weeks, respectively. The F0 animals were then mated to produce an F1 litter. Groups of 30 male and 30 female F1 animals were fed the same dose levels for at least 10 weeks postweaning, and the breeding program was repeated to produce F2 animals. F3 animals were produced from F2 animals by the same procedure. The study was terminated with the F3 weanlings. Test diets were fed continuously throughout the study. All F0, F1, and F2 adults and F3 weanlings (one/sex/litter) were necropsied and given a macroscopic examination. There were no effects on reproductive function for parental animals of either sex during any of the three generations in this study. At the highest dose level (1.0% DSS), body weights were lower than those of controls during the premating phase for males in all three generations and for F1 and F2 females. Body weights for F1 and F2 males and females in the 0.5% dose group were also low during the premating phase. Pup weights on Lactation Day 0 were significantly lower than those of controls only for the high-dose group during the third generation. However, lower pup weight gains in the mid- and high-dose groups resulted in significantly lower pup weights on Day 21 for all three generations. Perinatal pup survival across three generations ranged from 96 to 100% for the control and treated groups. Pup survival ranged from 95 to 100% for controls, from 98 to 100% for low- and mid-dose groups, and from 91 to 99% for the high-dose group. There were no treatment-related mortality and antemortem or macroscopic observations. In summary, DSS administered in the diet to three successive generations of rats at levels of 0.5 and 1.0% caused a reductions in body weights for parental males in all generations and for F1 and F2 females. Pup weights at the 0.5 and 1.0% dose levels were also lower than those of the control in all three generations. However, the reduced body weights did not interfere with development of normal reproductive performance. DSS at levels up to 1.0% had no effects on the reproductive function of either sex in any generation and produced no treatment-related antemortem or macroscopic observations.
Richard A Davis - One of the best experts on this subject based on the ideXlab platform.
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the toxicity bioaccumulation metabolism and elimination of Dioctyl Sodium Sulfosuccinate dss in rainbow trout oncorhynchus mykiss
Water Research, 1991Co-Authors: Mark S Goodrich, Mark J Melancon, Richard A Davis, John J LechAbstract:Abstract The acute toxicity (LC 50 ) of Dioctyl Sodium Sulfosuccinate (DSS) was determined to be 28 mg/l in rainbow trout. A static non-replacement exposure of rainbow trout to 14 C-labeled DSS was used to measure the bioaccumulation and elimination of DSS within four separate body compartments: blood, bile, viscera and carcass. The trout were exposed for 72 h followed by a 72 h period for depuration. Tissue samples were analyzed at 2, 4, 12, 24, 48 and 72 h during both the exposure and depuration phases of the experiment. Using scintillation counting, DSS concentrations were measured in tissues and used to calculate uptake rate constants, bioconcentration factors, elimination rate constants and half-lives of DSS elimination for each body compartment. The greatest rate of appearance of DSS was in the bile of the trout, while the slowest uptake occurred within the carcass. Elimination of DSS from the carcass and viscera of the trout was found to follow second order kinetics and elimination from the blood and bile followed first order kinetics. The evaluation of [ 14 C]DSS metabolism was conducted using the HPLC analysis of biliary metabolites following an intraperitoneal injection. Two major peaks were found containing 14 C that were not associated with the parent DSS peak.
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three generation reproduction study with Dioctyl Sodium Sulfosuccinate in rats
Toxicological Sciences, 1990Co-Authors: K Mackenzie, Richard A Davis, S Henwood, G Foster, F Akin, Peter J Debaecke, G Sisson, G MckinneyAbstract:Abstract Groups of 30 male and 30 female rats (F0) were fed diets containing 0, 0.1, 0.5, or 1.0% Dioctyl Sodium Sulfosuccinate (DSS) for 10 and 2 weeks, respectively. The F0 animals were then mated to produce an F1 litter. Groups of 30 male and 30 female F1 animals were fed the same dose levels for at least 10 weeks postweaning, and the breeding program was repeated to produce F2 animals. F3 animals were produced from F2 animals by the same procedure. The study was terminated with the F3 weanlings. Test diets were fed continuously throughout the study. All F0, F1, and F2 adults and F3 weanlings (one/sex/litter) were necropsied and given a macroscopic examination. There were no effects on reproductive function for parental animals of either sex during any of the three generations in this study. At the highest dose level (1.0% DSS), body weights were lower than those of controls during the premating phase for males in all three generations and for F1 and F2 females. Body weights for F1 and F2 males and females in the 0.5% dose group were also low during the premating phase. Pup weights on Lactation Day 0 were significantly lower than those of controls only for the high-dose group during the third generation. However, lower pup weight gains in the mid- and high-dose groups resulted in significantly lower pup weights on Day 21 for all three generations. Perinatal pup survival across three generations ranged from 96 to 100% for the control and treated groups. Pup survival ranged from 95 to 100% for controls, from 98 to 100% for low- and mid-dose groups, and from 91 to 99% for the high-dose group. There were no treatment-related mortality and antemortem or macroscopic observations. In summary, DSS administered in the diet to three successive generations of rats at levels of 0.5 and 1.0% caused a reductions in body weights for parental males in all generations and for F1 and F2 females. Pup weights at the 0.5 and 1.0% dose levels were also lower than those of the control in all three generations. However, the reduced body weights did not interfere with development of normal reproductive performance. DSS at levels up to 1.0% had no effects on the reproductive function of either sex in any generation and produced no treatment-related antemortem or macroscopic observations.
Matthew J Decuir - One of the best experts on this subject based on the ideXlab platform.
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comparison of the effectiveness of solid and solubilized Dioctyl Sodium Sulfosuccinate doss on oil dispersion using the baffled flask test for crude oil spill applications
Industrial & Engineering Chemistry Research, 2014Co-Authors: Emmanuel Nyankson, Courtney A Ober, Matthew J Decuir, Ram B GuptaAbstract:The accidental release of natural crude oil into our marine waters and its subsequent effect on the environment is one of the major problems that the environmental protection agencies and coast guards of most countries worldwide have to deal with. In this study, the effectiveness on oil dispersions of a composite particle made of paraffin wax and the surfactant Dioctyl Sodium Sulfosuccinate (DOSS) was compared to that of the same DOSS dissolved in a liquid solvent using the U.S. EPA’s baffled flask procedure. Solid dispersant composite particles were prepared by ultrasonically spray freezing paraffin wax and DOSS molten solution while varying the mass ratio. The amount of DOSS in the composite particle was determined by the methylene blue complexation procedure. Liquid delivery of DOSS was accomplished by dissolving the surfactant in propylene glycol (PG). The results from the study showed that the dispersion effectiveness of the DOSS–paraffin wax composite particles were dependent on particle size, the s...
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Comparison of the Effectiveness of Solid and Solubilized Dioctyl Sodium Sulfosuccinate (DOSS) on Oil Dispersion Using the Baffled Flask Test, for Crude Oil Spill Applications
2014Co-Authors: Emmanuel Nyankson, Matthew J Decuir, Courtney A. Ober, Ram B GuptaAbstract:The accidental release of natural crude oil into our marine waters and its subsequent effect on the environment is one of the major problems that the environmental protection agencies and coast guards of most countries worldwide have to deal with. In this study, the effectiveness on oil dispersions of a composite particle made of paraffin wax and the surfactant Dioctyl Sodium Sulfosuccinate (DOSS) was compared to that of the same DOSS dissolved in a liquid solvent using the U.S. EPA’s baffled flask procedure. Solid dispersant composite particles were prepared by ultrasonically spray freezing paraffin wax and DOSS molten solution while varying the mass ratio. The amount of DOSS in the composite particle was determined by the methylene blue complexation procedure. Liquid delivery of DOSS was accomplished by dissolving the surfactant in propylene glycol (PG). The results from the study showed that the dispersion effectiveness of the DOSS–paraffin wax composite particles were dependent on particle size, the solubility of the matrix material (paraffin wax) in the crude oil, and the DOSS-to-oil ratio (DOR, mg/g). This is because the paraffin wax would have to dissolve in the crude oil to release DOSS, which is then used for the dispersion of the crude oil. At 23 mg/g DOR, which was the maximum DOR used in the study, the dispersion effectiveness of the dispersant composite particles was 60 vol % and 62.6 vol % in the heavy Texas crude (TC) and the light crude (LC) oils, respectively. The dispersion effectiveness of the solubilized DOSS on TC was significantly higher than that of the dispersant composite particles; however, at DOR of 23 mg/g, the effectiveness of the dispersant composite particles on LC was just 1.8 vol % below that of the solubilized DOSS. There was a significant increase in the dispersion effectiveness when the mixing energy was increased from 150 to 200 rpm (rpm); nevertheless, the effectiveness was almost the same at 200 and 250 rpm. Dispersion effectiveness was analyzed at different salinity environments, that is, in brackish water (1.6 and 2.8 wt % salt concentration) and saline water (3.5 wt % salt concentration). The dispersant composite particles performed better at low salinities; however, the dispersion effectiveness almost leveled off at 2.8 and 3.5 wt % salt concentrations. The results of this study show the potential of dispersant composite particles to replace solubilized dispersants in oil spill remediation in the near future and, as a result, eliminate the environmental complications associated with the use of solvents in formulating traditional liquid dispersants