| http://www.w3.org/ns/prov#value | - n alkyl radical having from 1 to 4 carbon atoms, and other metal cations, the arylcarboxylic acid, arylsulfonic acid or arylphosphonic acid salts of which are soluble in water, ???N(R)4, wherein the radicals R, which may be identical or different, are each a hydrogen atom or an alkyl radical having from 1 to 4 carbon atoms, or ???OH; d is an integer ranging from 0 to 3; and the sum (a+b+c+d) is eq
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