Table 9. Surface Tensions σ of Aqueous Solutions Containing MEA (2), CO₂ (3), HEEDA (4), and OZD (5)^a.

					σ (mN/m)
x2	x3	x4	x5	α0	298.15 K	303.15	308.15	313.15 K	318.15 K	323.15 K	328.15 K
0.1072	0	0	8.98 × 10–3	0	64.125	63.428	62.667	62.455	61.673	61.098	60.275
0.1010	0.0584	0	8.46 × 10–3	0.578	74.585	74.160	73.630	73.060	72.540	71.678	71.185
0.0959	0	0.0189	0	0	64.180	63.596	62.880	61.430	60.468	59.325	57.485
0.0932	0.0278	0.0183	0	0.3	67.240	65.970	65.530	65.020	64.860	64.220	63.380
0.0907	0.0544	0.0178	0	0.6	69.822	69.180	68.665	68.020	67.560	66.900	66.080

^ax_i is the mole fraction of component i in aqueous solution, T is temperature, and α₀ is the measure of the CO₂ loading (see Table 3). Expanded uncertainties at 95% confidence are U(T) = 0.02 K, U(α₀) = 0.01, U(x₂) = U(x₃) = U(x₄) = 0.0002, and U(σ) = 1.2 mN/m.