Solubilization of 4-(2-Pyridylazo)resorcinol in hydrophobic–hydrophilic ionic liquids and extraction of heavy metal ions from aqueous solutions

Hydrophobic–hydrophilic ionic liquids for the extraction and determination of metal ions with water-soluble reagents

“…The ionic liquids were synthesized by Dr V. Baulin (Institute of Physiologically Active Compounds RAS, Chernogolovka) by methods based on procedures developed previously. 6,32 2.2. Instruments Spectrophotometric measurements were carried out using a U-2900 UV-vis recording spectrophotometer (Hitachi, Japan) with 1 cm glass cells.…”

“…The equilibrium content of water is 13.2 wt% (ref. 32) and 4.83 wt% (ref. 6) for TOALS and TOMAS, respectively; on a molar basis c w is 0.86 and 0.59, respectively.…”

“…Recently, we have described alkylammonium ionic liquids with non-uorinated anions, trioctylmethylammonium salicylate, TOMAS 6,30 and tetraoctylammonium N-lauroyl sarcosinate, TOALS. 31,32 They contain a very high amount of water, thus resembling non-aqueous phases of ABSs. Yet, these ILs are waterimmiscible in the absence of any salting-out agent.…”