| http://www.w3.org/ns/prov#value | - Suitable ions are also carboxylic RCO2??? and sulfonic RSO3??? acid anions, wherein R is an organic residue or hydrogen.The ion may also be a cation selected from the group comprising ammonium(+), lithium(+), sodium(+), potassium(+), rubidium(+), cesium(+), magnesium(2+), calcium(2+), strontium(2+), barium(2+), iron (2+/3+), cobalt(2+), nickel(2+), copper(2+), and zinc(2+), or a cation selected fr
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