USING TEMPERATURE-CONTROLLED IONIC LIQUID-LIQUID PHASE MICROEXTRACTION METHOD FOR EFFICIENT PRE.....

The measurement of chromium (VI) ions in water samples was proposed in this study using an efficient and easy pre-concentration process. The extractant solvent was a hydrophobic ionic liquid (1-octyl-3-methylimidazolium hexafluorophosphate, or [C8MIM] [PF6]). This ionic liquid (IL) was chosen over the others because of its strong hydrophobicity, which allows it to be completely separated from the aqueous phase. Without utilising an organic dispersing solvent, [C8MIM] [PF6] was dispersed in aqueous phase by just controlling the temperature at its optimum range. Chromium (VI) was first complexed with ammonium pyrrolidine dithiocarbamate (APDC) as a chelating agent, then a very small amount of [C8MIM] [PF6] was dispersed in water sample at optimum temperature, and the Cr (VI)-APDC complex was extracted into fine droplets of ionic liquid phase almost instantly. A high-resolution continuum-source flame atomic absorption spectrometer was used for the determination stage. Temperature, chelating agent volume, pH, ionic liquid amount, centrifugation time, and rate were all studied. The calibration graph was linear (R = 0.9975) in the range of 0.04 to 2.0 g mL under ideal conditions. The proposed method's limit of detection (3) was 0.01 g mL, and the relative standard deviation for seven replicated 1.0 g mL Cr (VI) tests was 1.03 percent.

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