Ion chromatography for monitoring [NTf₂]⁻ anion contaminants in pure and saline water

Abstract

An optimized ion chromatography method for quantifying highly polarizable [NTf2]− anions in high salinity wastewater is presented.

Linking the Thermal and Electronic Properties of Functional Dicationic Salts with Their Molecular Structures

“…Anion chromatography (AC) measurements were undertaken on a Thermofisher ICS5000+ with a Dionex IonPac AS20 (2 × 250 mm) analytical column and AG20 (2 × 50 mm) guard column, with a step gradient initially composed of 95% 18.2 MΩ cm –1 water and 5% 100 mM NaOH (to elute Br – ), followed by 20% HPLC-grade acetonitrile (99.9%), 75% water, and 5% 100 mM NaOH (to elute other ions). A flow of 0.25 mL min –1 was used, with an AERS500e 2 mm electrochemical suppressor (effective eluent strength was 5 mM OH – ), and analytes were detected via conductivity at 35 °C. , …”

“…A flow of 0.25 mL min −1 was used, with an AERS500e 2 mm electrochemical suppressor (effective eluent strength was 5 mM OH − ), and analytes were detected via conductivity at 35 °C. 36,37 XPS was measured on a Kratos Axis Ultra spectrometer with a monochromated Al Kα source of 1486.6 eV, a concentric hemispherical analyzer (CHA), hybrid magnetic/electrostatic optics, and a multichannel plate and delay line detector (DLD). The incident angle was 30°, and the collection angle was 0°to the surface normal.…”

Purification of Ionic Liquid Solvents in a Self-Optimizing, Continuous Microfluidic Process via Extraction of Metal Ions and Phase Separation

“…Although BMIM-NTf 2 is often thought of as a water-immiscible, hydrophobic solvent, it can dissolve considerable water content . In addition, wastewater even “perfectly” separated by the membrane can still carry a trace amount of dissolved IL. , We conducted thermogravimetric analysis (TGA) to determine the amount of IL in the wastewater, and 0.69 wt % (6900 ppm) of BMIM-NTf 2 was detected.…”

“…49 In addition, wastewater even "perfectly" separated by the membrane can still carry a trace amount of dissolved IL. 49,50 We conducted thermogravimetric analysis (TGA) to determine the amount of IL in the wastewater, and 0.69 wt % (6900 ppm) of BMIM-NTf 2 was detected.…”

A perspective on task-specific ionic liquids for the separation of rare earth elements

“…However, it should be noted that even hydrophobic ILs such as those with the commonly used bis(triuoromethanesulfonyl) imide ([NTf 2 ] − ) anion have partial solubilities in water, and therefore, portions of them can be lost to the aqueous phases during extractions. IL process design rarely deals with waste streams containing dissolved [NTf 2 ] − in water, 17 which can cause ecotoxicological issues due to the low biodegradability of the anion. 18,19 To help avoid this loss, the ILs can be made more hydrophobic by using cations with long alkyl chains.…”