Classifications

• • C—CHEMISTRY; METALLURGY
  • C05—FERTILISERS; MANUFACTURE THEREOF
  • C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
  • C05D9/00—Other inorganic fertilisers
  • C05D9/02—Other inorganic fertilisers containing trace elements
• • C—CHEMISTRY; METALLURGY
  • C05—FERTILISERS; MANUFACTURE THEREOF
  • C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
  • C05G5/00—Fertilisers characterised by their form
  • C05G5/20—Liquid fertilisers
  • C05G5/23—Solutions

Definitions

• the present invention is generally about solubilization of iron ions in aqueous systems.
• a specific implementation of the invention is in preparing solubilized chelated iron to crops in an easily manageable form.
• the commercial phenolic chelating agents EDDHA ethylene diamine di- o- hydroxy phenylacetic acid
• EDDHMA ethylene diamine di- o- hydroxy phenyl methyl acetic acid
• a product made according to the invention is an aqueous solution characterized in having a high pH value, containing solubilized iron ions chelated by at least one ligand comprising a plurality of hydroxyl groups, in such a manner that pouring said solution into water delivers into the water the chelated iron without the need for any effort other than the pouring action itself, said water being characterized in that its pH value may be between 3 to 12, such that the new mixture formed with said water is stable over periods extending above at least two days.
• a method for processing iron chelated with phenolic, ethylene diamine based ligands such that an aqueous solution is obtained comprising adding a ligand having a plurality of hydroxyl groups, in high pH environment, said solution characterized in providing a source of chelated iron stable over a wide range of pH values.
• SequestreneTM which is a ferric ion chelate with EDDHA by Ciba-Geigy, containing 6% chelated iron, was mainly used to demonstrate the method according to the invention.
• Example 1 Ten grams of SequestreneTM were mixed with 300 ml of tap water. The slurry was stirred thoroughly and after 30 minutes all the solubles were dissolved.
• Example 2 Ten grams of SequestreneTM were mixed with 70 ml water in a beaker. After stirring the slurry, a clear solution formed with some undissolved granules left on the bottom of the beaker. In a separate beaker, 8 grams of tartaric acid and 18 grams of KOH were mixed with 50 ml water. The mixture, having a high pH value, was stirred until settling and clearing. After cooling down the clear solution, it was poured with stirring into the beaker containing the SequestreneTM. Immediately a dark clear solution formed, with all granules dissolved except for slight light-brown residue remaining on a Whatman no. 1 filter paper after filtering. Example 3. Eight grams of tartaric acid (food grade) and 18 grams of
• Example 4 Eight grams of KOH were slowly dissolved in 50 ml water in a beaker. The solution cleared and was left to cool down. Ten grams of SequestreneTM were consequently introduced into the beaker and mixed thoroughly with the clear solution. The high pH solution became turbid with a light-brown slurry forming, which turned into a thick brown residue, indicating disruption of the chelate. The supernatant above the residue was very dark indicating the existence of chelated iron there. Example 5. Eight grams of tartaric acid (food grade) and 18 grams of
• Example 6 Eight grams of KOH and 10 grams of mannitol were slowly dissolved in 50 ml water in a beaker. The high pH solution cleared and was left to cool down. Ten grams of SequestreneTM were introduced into the solution and stirred thoroughly. A clear dark solution formed with only a slight light-brown residue left on the Whatman no. 1 filter paper after filtering.
• Example 7. To 500 ml solution of 0.5 Molar EDDHMA were added 75 grams of tartaric acid (food grade). While mixing, 130 grams KOH were added, forming a clear solution. After cooling, 0.5 Moles of FeC13.6H20 were added while stirring, forming a dark slurry. Upon further addition of 80 grams KOH a quick solubilization response was induced, producing a dark high pH solution, with no apparent disruption of the chelate. Further addition of 300 ml water kept the solution stable without the formation of residue.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Inorganic Chemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• Pest Control & Pesticides (AREA)
• Fertilizers (AREA)
• Agricultural Chemicals And Associated Chemicals (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

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Publications (2)

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Citations (6)

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• 1997
  • 1997-08-17 IL IL12156097A patent/IL121560A0/xx unknown
• 1998
  • 1998-08-17 AU AU89095/98A patent/AU8909598A/en not_active Abandoned
  • 1998-08-17 WO PCT/US1998/016994 patent/WO1999008982A1/en not_active Application Discontinuation
  • 1998-08-17 BR BR9811206-6A patent/BR9811206A/pt not_active Application Discontinuation
  • 1998-08-17 EP EP98940932A patent/EP1025063A4/de not_active Withdrawn

Patent Citations (6)

Non-Patent Citations (1)

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