An effective pyrolytic method has been developed for the separation of micro and macro quantities of

Sorption of ethylhexadecyldimethyl ammonium (EHDDMA+), a large organic cation, and three neutral organic compounds (NOC's) on two low organic carbon aquifer materials was studied using a soil batch equilibration technique. EHDDMA+ competed effectively with metals for exchange sites and EHDDMA+ sorption was accompanied by an equimolar charge desorption of metals. NOC's sorption on the aquifer materials was low (K 0.22) which was consistent with the sorbent's low organic carbon content. However, EHDDMA+ sorption increased toluene sorption by two orders of magnitude. The enhanced toluene sorption was. due to the hydrophobic surface provided by the hydrocarbon moiety of sorbed EHDDMA+. 585

Synthesis and local structure of doped nanocrystalline zinc oxides

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