| http://www.w3.org/ns/prov#value | - This may be added asCaO or Ca(OH).sub.2 for example.With respect to compound 3Me(II)O.(R.sub.1,R.sub.2).sub.2O.sub.3(Me(II)(anion).sub.2.nH.sub.2O wherein R.sub.1 and R.sub.2 are Al, Fe or Cr, anion is NO.sub.2, NO.sub.3 or OH and n is 0 to 24 where Me(II) is a cation such as Ca, anion may bepartially substituted by other divalent cations or may be completely substituted by other divalent cations
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