EP1025063A1 - Compositions comprising iron chelates - Google Patents
Compositions comprising iron chelatesInfo
- Publication number
- EP1025063A1 EP1025063A1 EP98940932A EP98940932A EP1025063A1 EP 1025063 A1 EP1025063 A1 EP 1025063A1 EP 98940932 A EP98940932 A EP 98940932A EP 98940932 A EP98940932 A EP 98940932A EP 1025063 A1 EP1025063 A1 EP 1025063A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- solution
- iron
- chelated
- water
- grams
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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.
Landscapes
- 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)
Abstract
A composition capable of providing a high concentration of soluble chelated iron which can be easily distributed to plants includes a high pH aqueous solution containing solubilized iron ions chelated by at least one ligand having a plurality of hydroxyl groups to produce a liquid iron chelate solution which can be mixed with water and which is stable over periods of time extending at least two days.
Description
COMPOSITIONS COMPRISING TRON CHFT ATFS Field of the Invention
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.
Background of the Invention The use of synthetic phenolic chelating agents for solubilizing iron is a well known practice in aqueous systems buffered to pH values higher than neutral. In the environments of hard water being buffered by carbonates or bicarbonates, a constant value of pH above 7.5 is maintained. For agricultural purposes, application of iron chelates to soils being buffered by carbonates causes fast removal of the iron ions from the chelating agent, thus rendering the iron ion prone to precipitation in the form of sparingly soluble ferric hydroxide (Chen and Barak, Iron nutrition of plants in calcareous soils, 1982, Advances in Agronomy, 35: 217-240). The commercial phenolic chelating agents EDDHA (ethylene diamine di- o- hydroxy phenylacetic acid) and EDDHMA (ethylene diamine di- o- hydroxy phenyl methyl acetic acid) effectively bind ferric ions up to pH values well above those occurring in soils and thus favoring the use of said phenolic chelating agents in agriculture in the most demanding conditions occurring in soils. However, the phenolic chelates suffer from two main shortcomings: (a) their high prices and (b) handling difficulty associated with the need to spend time and effort on solubilizing dry commercial preparation in the fertilizing tank.
To deliver liquid iron chelate to the consumer would be beneficial due to the fact that modern fertilizing schemes tend to prefer using ready made soluble mixes of liquid fertilizers to dispersion of granular forms of fertilizers in the fields or orchards. A product overcoming the shortcomings indicated above to an appreciable extent, would constitute an improvement in the delivery and consumption of iron chelates. However, saving the cost of drying in the manufacturing process requires that the extent that the remaining water, by raising the cost of transportation, should not compromise the above saving. Consequently, the solution should be as concentrated as possible in order to become more cost efficient.
Summary of the Invention
The present invention provides a means for the production of high concentrations of soluble chelated iron capable of being easily distributed to plants. By one of its aspects 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.
According to another aspect of the invention, there is provided 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.
Description of the Invention Sequestrene™, 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 Sequestrene™ 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 Sequestrene™ 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 Sequestrene™. 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
KOH were slowly dissolved in 50 ml water and the high pH mixture formed was stirred until completely clear and left to cool. Then 10 grams of Sequestrene™ were introduced into the solution, stirring thoroughly until the mixture became
clear. Only a minor light-brown residue remained on a Whatman no. 1 filter paper after filtering.
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 Sequestrene™ 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
KOH were slowly dissolved in 25 ml water and the high pH mixture formed was stirred until completely clear, then allowed to cool down. Consequently, 10 grams of Sequestrene™ were introduced into the solution, stirring throughly until the mixture became clear. In this case the dissolving action required a considerably longer time than in Example 3, without some of the chelate being dissolved.
However, no light-brown slurry was formed as in Example 4, indicating no disruption of the chelate.
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 Sequestrene™ 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.
Claims
aims 1. An aqueous solution characterized in having a high pH value, containing solubilized iron ions chelated by at least one ligand having 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 about 3 to 12.5, such that the new mixture formed with said water is stable over periods extending above at least two days.
2. A solution as in claim 1 having a pH value exceeding 12.
3. A solution as in claim 1 containing EDDHA.
4. A solution as in claim 1 containing EDDHMA.
5. A solution as in claim 1 containing polyhydroxy acid.
6. A solution as in claim 1 containing polyhydroxy alcohol.
7. A solution as in claim 1 containing at least a half percent in weight of iron, in chelated form.
8. 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 hydroxy groups, in a high pH environment, said solution characterized in providing a source of chelated iron stable over a large range of pH values.
9. A method as in claim 8 used for supplying stably chelated iron to aqueous environments having pH values ranging between 3 to 9.
10. A method as in claim 8 used for supplying stably chelated iron to aqueous environments having pH values ranging between about 5 to 12.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IL12156097 | 1997-08-17 | ||
| IL12156097A IL121560A0 (en) | 1997-08-17 | 1997-08-17 | Compositions comprising iron chelates and their production |
| PCT/US1998/016994 WO1999008982A1 (en) | 1997-08-17 | 1998-08-17 | Compositions comprising iron chelates |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1025063A1 true EP1025063A1 (en) | 2000-08-09 |
| EP1025063A4 EP1025063A4 (en) | 2001-05-16 |
Family
ID=11070512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98940932A Withdrawn EP1025063A4 (en) | 1997-08-17 | 1998-08-17 | Compositions comprising iron chelates |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1025063A4 (en) |
| AU (1) | AU8909598A (en) |
| BR (1) | BR9811206A (en) |
| IL (1) | IL121560A0 (en) |
| WO (1) | WO1999008982A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005026080A1 (en) * | 2003-09-12 | 2005-03-24 | Norman Klaunzer | Fe(iii)-complexes for use as micronutrients for fertilizers |
| GB2411896A (en) * | 2004-03-11 | 2005-09-14 | Yoram Tsivion | Plant feed solutions comprising nutritive metals |
| CN115124097B (en) * | 2022-07-08 | 2024-05-03 | 陕西新泓水艺环境科技有限公司 | Balanced water inlet control method, device, water inlet device, system and medium |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2943100A (en) * | 1956-01-23 | 1960-06-28 | Pfanstiehl Lab Inc | Chelation composition and method of making the same |
| DE2138068A1 (en) * | 1970-08-27 | 1972-03-16 | Deutsche Itt Industries Gmbh, 7800 Freiburg | Foliar spray to combat chlorosis in evergreen fruit trees |
| US4265653A (en) * | 1979-07-05 | 1981-05-05 | Pfizer Inc. | Manganese micronutrient solutions |
| EP0187423A2 (en) * | 1985-01-09 | 1986-07-16 | Belgium Marketing Services N.V. | Dry leaf-fertilizing components |
| EP0658529A1 (en) * | 1993-12-15 | 1995-06-21 | Benyamin, Aharon | Plant nutrient metal-bearing compositions |
| GB2291641A (en) * | 1994-07-26 | 1996-01-31 | Lambson Ltd | Fertiliser composition |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2936316A (en) * | 1955-02-25 | 1960-05-10 | Chicopee Mfg Corp | Chelated metal compounds |
| US3958972A (en) * | 1974-07-05 | 1976-05-25 | Monsanto Company | Chelates of 1,2-diaminocyclohexane tetrakis (methylene phosphonic acid) useful for supplying nutrient metals to plants growing in calcareous soil |
| GB8807197D0 (en) * | 1988-03-25 | 1988-04-27 | Phosyn Group Ltd | Iron chelate composition |
| IL95241A (en) * | 1990-07-31 | 1991-06-30 | Yoram Zivion | Fertilizer compositions for administering ionic metal microelements to plant roots |
-
1997
- 1997-08-17 IL IL12156097A patent/IL121560A0/en unknown
-
1998
- 1998-08-17 EP EP98940932A patent/EP1025063A4/en not_active Withdrawn
- 1998-08-17 AU AU89095/98A patent/AU8909598A/en not_active Abandoned
- 1998-08-17 BR BR9811206-6A patent/BR9811206A/en not_active Application Discontinuation
- 1998-08-17 WO PCT/US1998/016994 patent/WO1999008982A1/en not_active Application Discontinuation
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2943100A (en) * | 1956-01-23 | 1960-06-28 | Pfanstiehl Lab Inc | Chelation composition and method of making the same |
| DE2138068A1 (en) * | 1970-08-27 | 1972-03-16 | Deutsche Itt Industries Gmbh, 7800 Freiburg | Foliar spray to combat chlorosis in evergreen fruit trees |
| US4265653A (en) * | 1979-07-05 | 1981-05-05 | Pfizer Inc. | Manganese micronutrient solutions |
| EP0187423A2 (en) * | 1985-01-09 | 1986-07-16 | Belgium Marketing Services N.V. | Dry leaf-fertilizing components |
| EP0658529A1 (en) * | 1993-12-15 | 1995-06-21 | Benyamin, Aharon | Plant nutrient metal-bearing compositions |
| GB2291641A (en) * | 1994-07-26 | 1996-01-31 | Lambson Ltd | Fertiliser composition |
Non-Patent Citations (1)
| Title |
|---|
| See also references of WO9908982A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1025063A4 (en) | 2001-05-16 |
| IL121560A0 (en) | 1998-02-08 |
| AU8909598A (en) | 1999-03-08 |
| BR9811206A (en) | 2002-09-24 |
| WO1999008982A1 (en) | 1999-02-25 |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| 18D | Application deemed to be withdrawn |
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