COMPOSICAO QUE COMPREENDENDE UM COMPOSTO DE ELEMENTOS TRACOS,PROCESSO PARA PROVE-LA E PROCESSO PARA FABRICA -LA

摘要

A composition for providing a substantially controlled level of dissolved trace element in water comprises a trace element compound in a relatively insoluble form. Preferably the composition comprises a relatively insoluble trace element compound and a binder which results in the composition having a different solubility product to that of the trace element alone. The binder may be plaster of paris.