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The negative‐ion mode of electrospray ionization mass spectrometry (ESI‐MS) is intrinsically less sensitive than the positive‐ion mode. The detection and quantitation of anions can be performed in positive‐ion mode by forming specific ion‐pairs during the electrospray process. The paired‐ion electrospray ionization (PIESI) method uses specially synthesized multifunctional cations to form positively...
Ionic liquids (ILs) are composed entirely of ions and they possess fascinating properties, including low volatility, tunable viscosity and miscibility, and electrolytic conductivity, which make ILs unique and useful for many applications in chemical analysis. The dramatic increase in the number of publications on ILs is indicative of the tremendous interest in this field from analytical chemists....
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