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US 6,638,539 B2Granted
Trace elements
AssigneeWarburton Technology Limited
InventorsRobert Naylor Laurie, Lambertus Petrus Vosloos
Life of this patent
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Abstract
A method of preparing a trace element solution includes the steps of providing at least one EDTA-complex, providing a sodium selenite solution, and combining the EDTA-complex(es) and the sodium selenite solution to form a trace element solution. An EDTA complex is prepared by using disodium EDTA or EDTA acid, selenium, and any other suitable mineral.
Claims7
A method of preparing a trace element solution, said method consisting essentially of the steps of:
- (a) preparing a single solution comprising more than one EDTA-complex as a sodium salt in a single continuous process by suspending either disodium EDTA in water or suspending EDTA acid in water with sodium hydroxide, and adding a metal compound selected from the group consisting of metal oxides, metal hydroxides and metal carbonates to the EDTA solution to form the EDTA-complex;
- and
- (b) adding sodium selenite to the solution of EDTA-complexes to form the trace element solution in which the molar ratio of selenium in the form of sodium selenite to the metal compounds to the EDTA complexes varies between 1:4.8:4.8 and 1:19:19.
Dependencies are inferred from the claim text.