Cloud point-dispersive liquid-liquid microextraction for preconcentration and separation of mercury in wastewater samples by methylsulfanyl thiophenol material

A efficient method based on ۴-methylsulfanyl thiophenol (MSTP, C۷H۸S۲) and ionic liquid ([BMIM][PF۶]) was used for mercury (Hg) separation and preconcentration from wastewater of petrochemical industries. The ۰.۰۱ mile molar of MSTP, ۸۰ mg of [BMIM][PF۶] was diluted with ۰.۲ mL of ethanol (Et ۹۸%). The mixture was injected to ۱۰ mL of wastewater samples, shacked by ultrasonic bath for ۵.۰ min and cloudy solution was achieved by ionic liquid micelles at pH=۷.۰. The mercury ions was complexed with MSTP and extracted on micelles (IL/Et) by cloud point dispersive liquidliquid microextraction (CP-DLLME) at ۵۰oC before determined by cold vapor atomic absorption spectrometry (CV-AAS). The favorite extraction for mercury with low LOD (۱۵ ng L-۱) and good linear rages (۰.۰۵- ۶.۲ μg L-۱) was achieved (RSD<۵%). The main parameters such as, pH, sample volumes, amount of MSTP, amount of IL and ultra-sonic time were optimized. The method validated by spiking samples and certified reference material (CRM, NIST) in water sample.

کلیدواژه ها:

Mercury ، Wastewaters ، Methylsulfanyl thiophenol ، Ionic liquid ، Cloud point dispersive liquidliquid microextraction