Table 1. Description of Chemical Samples^a.

Chemical name	CAS number	Abbreviation	Supplier	Purity as supplied	Additional purification
Carbon dioxide	124-38-9		BOC	x = 99.995%	None
Water	7732-18-5		N/Ab	ρe = 25 MΩ cm	Degassed
Ethanolamine	141-43-5	MEA	Sigma-Aldrich	w = 99.0%	None
2-Oxazolidone	497-25-6	OZD	VWR Int.	w = 99.0%	None
N-(2-Hydroxyethyl) ethylenediamine	111-41-1	HEEDA	Sigma-Aldrich	w = 99.0%	None
1-(2-Hydroxyethyl)-2-imidazolidinone	3699-54-5	HEIA	Sigma-Aldrich	w = 75.0%c	Dehydration

^ax is mole fraction, w is mass fraction, and ρ_e denotes electrical resistivity at T = 298.15 K.

^bObtained from a Millipore Direct Q-UV water purification system.

^cPurity of dried HEIA is w ≈ 95%.