prov:value
| - M is a member selected from the group consisting of metal ions of Group I, ll, III, \IV-A and VIII of the Periodic Table, and more preferably a member selected from the group consisting of monovalent metal ions Na+, K, Li+, Cs+, Ag+, Hg+ and 01+; divalent metal ions Be, Mg, Ca, Sr, Ba, Cu+ Cd, Hg, Sn+ Pb+ Pe Co Ni and Zn; trivalent metal ions Al+ Se+ Pe and Y. A complete list of metal ions for use
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