Speciation of arsenic in wastewater samples based on pyributicarbamate /ionic liquids by dispersive liquid-liquid microextraction

Abstract

A simple and applied method based on O-3-Tert-butylphenyl N-(6-methoxy-2-pyridyl)-N-methylthiocarbamate (Pyributicarbamate; TBMPMTC) was used for arsenic speciation (AsIII and AsV) in urine and water samples by dispersive liquid-liquid microextraction (DLLME) procedure. The concentrations of arsenic in the liquid phase were determined by hydride generation atomic absorption spectrometry in the presence of flame accessory (HG-AAS). By procedure, a mixture of ionic liquid (0.1 g, [APMIM][PF6]@[HMIM][PF6]), acetone (0.2 mL) and pyributicarbamate was injected into wastewater sample containing arsenic (AsIII and AsV) ions, which were already extracted by pyributicarbamate at the optimized pH. The task-specific ionic liquid (TSIL) of 1-3-aminopropyl)-3-methyl-imidazoliumhexafluorophosphate [APMIM][PF6] was chemically synthesized and used for increasing of As(V) extraction in the liquid phase. As(III) was extracted based on the sulfur bond of pyributicarbamate at pH=5.3. As (V) can be extracted by amine group of TBMPMTC and [APMIM][PF6] at pH=3.0 (As(V) --- : NH2). The influence of parameters was studied.

Clay-Alginate Beads Loaded with Ionic Liquids: Potential Adsorbents for the Efficient Extraction of Oil from Produced Water

“…The literature shows that ILs and IL-based materials have a good potential for wastewater treatment and are being used for the removal of multiple pollutants from wastewater [ 34 , 35 , 36 , 37 , 38 , 39 ]. In this research, clay-alginate beads, loaded with ILs, were synthesized and successfully employed for the oil adsorption from PW, through the adsorption process.…”