NUTRIENT COMPOSITION FOR BIOLOGICAL SYSTEMS

34223422A nutrient composition for biological systems such as humans animals plants and microorganisms which comprises at least one monometallic or mixed metallic phosphate of the (M1 M2 M3...Mx)(PO) ?a HO type where 0 = a = 9 where (M1 M2 M3... Mx) represent the one metal of the monometallic phosphate or the two or more metals of the mixed metallic phosphate and are selected from Na K Mg Ca Cr Mo W Mn Fe Co Ni Cu Zn and B with the proviso that at least one of the metals in the phosphate is selected from Mn Fe Co and Ni the at lest one phosphate being preparable or having been prepared by a) preparing an aqueous solution (I) comprising at least one or more than one of the metals Mn Fe Co and/or Ni as divalent cations by introducing oxidic metal(II) metal(III) and/or metal(IV) compounds or mixtures or compounds thereof having mixed oxidation states selected from hydroxides oxides oxide hydroxides oxide hydrates carbonates and hydroxide carbonates of at least one of the metals Mn Fe Co and/or Ni together with the elemental forms or alloys of at least one of the metals Mn Fe Co and/or Ni into an aqueous medium comprising phosphoric acid and reacting the oxidic metal compounds with the elemental forms or alloys of the metals (in a redox reaction) to give the divalent metal ions b) removing any solids present from the aqueous phosphoric acid solution (I) c) if the phosphate is a mixed metallic phosphate and in addition to the metals introduced into the solution in stage a) comprises further metals selected from (M1 M2 M3... Mx) at least one compound of at least one of the metals (M1 M2 M3... Mx) is additionally added to the aqueous solution (I) in the form of an aqueous solution or as a solid in the form of a salt the at least one compound preferably being selected from hydroxides oxides oxide hydroxides oxide hydrates carbonates hydroxide carbonates carboxylates sulfates chlorides or nitrates of the metals d) providing an initial charge solution (II) having a pH of 5 to 8 which has been prepared from an aqueous phosphoric acid solution by neutralization with an aqueous alkali metal hydroxide solution or has been prepared from an aqueous solution of one or more alkali metal phosphates metering the aqueous solution (I) into the initial charge solution (II) and simultaneously metering in a basic aqueous alkali metal hydroxide solution such that the pH of the resulting mixture is kept within the range from 5 to 8 preferably 6 to 7 the phosphate of the (M1 M2 M3...