Effects of oil dispersant on solubilization, sorption and desorption of polycyclic aromatic hydrocarbons in sediment-seawater systems

被引：40
作者：
Zhao, Xiao [1 ]
Gong, Yanyan [1 ]
O'Reilly, S. E. [2 ]
Zhao, Dongye [1 ]
机构：
[1] Auburn Univ, Dept Civil Engn, Environm Engn Program, Auburn, AL 36849 USA
[2] Bur Ocean Energy Management, GOM Reg, Off Environm, New Orleans, LA 70123 USA
来源：
MARINE POLLUTION BULLETIN | 2015年 / 92卷 / 1-2期
关键词：
Oil; Oil spill; Dispersant; Polycyclic aromatic hydrocarbon; Sediment; Sorption; PETROLEUM-HYDROCARBONS; MIXED MICELLES; WATER; SURFACTANTS; FATE; PHENANTHRENE; TEMPERATURE; NAPHTHALENE; ECOSYSTEM; KINETICS;
D O I：
10.1016/j.marpolbul.2014.12.042
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
This work investigated effects of a prototype oil dispersant on solubilization, sorption and desorption of three model PAHs in sediment-seawater systems. Increasing dispersant dosage linearly enhanced solubility for all PAHs. Conversely, the dispersant enhanced the sediment uptake of the PAHs, and induced significant desorption hysteresis. Such contrasting effects (adsolubilization vs. solubilization) of dispersant were found dependent of the dispersant concentration and PAH hydrophobicity. The dual-mode models adequately simulated the sorption kinetics and isotherms, and quantified dispersant-enhanced PAH uptake. Sorption of naphthalene and 1-methylnaphthalene by sediment positively correlated with uptake of the dispersant, while sorption of pyrene dropped sharply when the dispersant exceeded its critical micelle concentration (CMC). The deepwater conditions diminished the dispersant effects on solubilization, but enhanced uptake of the PAHs, albeit sorption of the dispersant was lowered. The information may aid in understanding roles of dispersants on distribution, fate and transport of petroleum PAHs in marine systems. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：160 / 169
页数：10
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