| http://www.w3.org/ns/prov#value | - Said salt is adjusted by addition of an acid, in particular acetic acid, to the required pH. In a preferred embodiment of the crystallization method, the buffer concentration (total acetate) in said aqueous crystallization mixture is 0 to about 0.5 M, or about 0.02 to about 0.5 M, as for example about 0.05 to about 0.3 M, or about 0.15 to about 0.2 M.
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