Influence of ionic surfactants on the flocculation and sorption of palladium and mercury in the aquatic environment.

摘要: The influence of sub-micellar concentrations an anionic surfactant (sodium dodecyl sulphate; SDS) and a cationic (hexadecyl trimethylammonium bromide; HDTMA) on the aquatic behaviour strongly complexing metals, Pd(II) Hg(II), has been investigated. In river water, flocculation organic complexes metal was suppressed by SDS but accentuated HDTMA, effects that are consistent with electrostatic hydrophobic interactions between ionic surfactants natural polyelectrolytes. sea enhanced both because shielding salting inorganic ions these interactions. Particle surface modification engendered sorbed influenced sorption Pd Hg to estuarine particles. Thus, hydrophobically bound enhances negative charge at particle favours specific metal, while specifically HDTMA solvency surface, favouring non-specific complexes. Given relatively short environmental half-life SDS, its impacts metals predicted be localised. However, greater stability suggests such including sorption, likely more pervasive.