| http://www.w3.org/ns/prov#value | - The surfactant may for example be present at a concentration of at least about 0.002 M, at least about 0.005 M or at least about 0.01 M, e.g., about 0.002 to about 1 M, about 0.005 to about 0.7 M or about 0.01 to about 0.5 M. Expressed on a weight basis, the surfactant may for example be greater than about 0.2 wt. % of the solvating system, e.g., about 0.3% to about 30%, about 0.5% to about 25% or
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