ZA200203783B - Buffered phosporous containing solution. - Google Patents
Buffered phosporous containing solution. Download PDFInfo
- Publication number
- ZA200203783B ZA200203783B ZA200203783A ZA200203783A ZA200203783B ZA 200203783 B ZA200203783 B ZA 200203783B ZA 200203783 A ZA200203783 A ZA 200203783A ZA 200203783 A ZA200203783 A ZA 200203783A ZA 200203783 B ZA200203783 B ZA 200203783B
- Authority
- ZA
- South Africa
- Prior art keywords
- solution
- acid
- base
- phosphorous acid
- locus
- Prior art date
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- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 claims description 35
- 239000002585 base Substances 0.000 claims description 32
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 claims description 30
- 239000011574 phosphorus Substances 0.000 claims description 28
- 229910052698 phosphorus Inorganic materials 0.000 claims description 28
- -1 phosphorus compound Chemical class 0.000 claims description 25
- 150000003839 salts Chemical class 0.000 claims description 23
- 239000000872 buffer Substances 0.000 claims description 19
- 239000002253 acid Substances 0.000 claims description 18
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 12
- 150000001875 compounds Chemical class 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 239000003337 fertilizer Substances 0.000 claims description 7
- 230000000855 fungicidal effect Effects 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 150000002391 heterocyclic compounds Chemical class 0.000 claims description 6
- 150000007530 organic bases Chemical class 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 229910000288 alkali metal carbonate Inorganic materials 0.000 claims description 4
- 150000008041 alkali metal carbonates Chemical class 0.000 claims description 4
- 150000008044 alkali metal hydroxides Chemical class 0.000 claims description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 4
- 239000011707 mineral Substances 0.000 claims description 4
- 125000004433 nitrogen atom Chemical group N* 0.000 claims description 4
- ACVYVLVWPXVTIT-UHFFFAOYSA-N phosphinic acid Chemical compound O[PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-N 0.000 claims description 4
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 claims description 3
- 229910052783 alkali metal Inorganic materials 0.000 claims description 2
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 2
- 241000233866 Fungi Species 0.000 claims 2
- 239000007795 chemical reaction product Substances 0.000 claims 2
- 239000000243 solution Substances 0.000 description 52
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 21
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 18
- 241000196324 Embryophyta Species 0.000 description 15
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 9
- 229910000027 potassium carbonate Inorganic materials 0.000 description 9
- 239000008366 buffered solution Substances 0.000 description 8
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000007853 buffer solution Substances 0.000 description 5
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 5
- 239000000417 fungicide Substances 0.000 description 4
- 229910019142 PO4 Inorganic materials 0.000 description 3
- 239000012153 distilled water Substances 0.000 description 3
- 235000021317 phosphate Nutrition 0.000 description 3
- AQSJGOWTSHOLKH-UHFFFAOYSA-N phosphite(3-) Chemical class [O-]P([O-])[O-] AQSJGOWTSHOLKH-UHFFFAOYSA-N 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 2
- 125000005587 carbonate group Chemical group 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 1
- QEWLHSNMEXFSCI-UHFFFAOYSA-N Alloclamide hydrochloride Chemical compound Cl.CCN(CC)CCNC(=O)C1=CC=C(Cl)C=C1OCC=C QEWLHSNMEXFSCI-UHFFFAOYSA-N 0.000 description 1
- YASYEJJMZJALEJ-UHFFFAOYSA-N Citric acid monohydrate Chemical compound O.OC(=O)CC(O)(C(O)=O)CC(O)=O YASYEJJMZJALEJ-UHFFFAOYSA-N 0.000 description 1
- 241000207199 Citrus Species 0.000 description 1
- HMEKVHWROSNWPD-UHFFFAOYSA-N Erioglaucine A Chemical compound [NH4+].[NH4+].C=1C=C(C(=C2C=CC(C=C2)=[N+](CC)CC=2C=C(C=CC=2)S([O-])(=O)=O)C=2C(=CC=CC=2)S([O-])(=O)=O)C=CC=1N(CC)CC1=CC=CC(S([O-])(=O)=O)=C1 HMEKVHWROSNWPD-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 241000233654 Oomycetes Species 0.000 description 1
- 241000233678 Peronosporales Species 0.000 description 1
- 244000025272 Persea americana Species 0.000 description 1
- 241000233614 Phytophthora Species 0.000 description 1
- 241000233639 Pythium Species 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 235000012745 brilliant blue FCF Nutrition 0.000 description 1
- 239000004161 brilliant blue FCF Substances 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 235000020971 citrus fruits Nutrition 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000004323 potassium nitrate Substances 0.000 description 1
- 235000010333 potassium nitrate Nutrition 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000001117 sulphuric acid Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
Landscapes
- Agricultural Chemicals And Associated Chemicals (AREA)
Description
BUFFERED PHOSPHORUS CONTAINING SOLUTION
This invention relates to buffered phosphorus containing solutions, including such fertiliser solutions and including such fungicidal solutions.
The use of phosphorous acid and phosphites instead of phosphoric acid and phosphates as fertilisers and/or fungicides are known. Phosphorous acid and phosphites have the advantage over phosphates in that they are more readily absorbable by the foliage of plants such as citrus and avocado plants. Another advantage is that phosphites have fungicidal properties in addition to their fertilising properties.
Accordingly phosphite compositions in an unbuffered form have been marketed for foliage uptake and for applications to the soil. These compositions are sold as concentrated solutions that have to be diluted with water prior to application. It will be appreciated that the pH of the water used
: 0) 01/42169 PCT/ZA00/00178 during dilution will have an influence on the pH of the diluted solution. In some cases the quality of the water may be such that the pH of the diluted solution may be influenced to such an extent that it falls outside the range where the diluted solution is suitable to be taken up by foliage. The pH range, which is acceptable for the solution to be taken up by the plant foliage, differs from one plant type to another, but usually it is from a pH of about 5 to a pH of about 7.
US Patent 4,075,324 describes fungicidal compositions containing phosphorous acid, inorganic and organic salts thereof.
US Patent 5,514,200 describes a buffered fertiliser composition comprising an organic acid and salts thereof and a phosphorous containing acid and salts thereof, which upon dilution forms a substantially fully solubilised fertiliser having a foliage acceptable pH for phosphorous uptake. The patent accordingly teaches how to overcome the above disadvantage. The patent teaches that the fertiliser comprises a double or multiple buffer systems that stabilise the phosphorous species against oxidation to phosphate. It further claims that the properties of phosphite that make it desirable as a fertiliser are enhanced when formulated as a double or multiple buffer according to the invention. Furthermore it is claimed that increased solubility of the formulation is obtained and that greater uptake of phosphorous is achieved.
It is an object of the present invention to provide an alternative buffered phosphorus containing solution, especially to such solutions for application to plants.
According to the present invention there is provided a buffered phosphorus containing solution containing at least one phosphorus compound selected from the group consisting of phosphorous acid, hypophosphorous acid, polyphosphorous acid, polyhypophosphorous acid, and salts thereof; and a : buffer including an organic base in the form of a nitrogen containing compound and is conjugate acid.
It will be appreciated that since the phosphorus containing solution is in fact a solution the phosphorus compound will usually be dissolved therein.
Preferably the solution comprises an aqueous solution.
The solution may comprise a concentrated solution of the phosphorus compound. Preferably the solution has a concentration from 2 mol.dm” to 8 mol.dm? of the phosphorus compound. More preferably the concentration is from 4.5 mol.dm®to 7.5 mol.dm®. Most preferably the concentration is about 6.8 mol.dm™. ‘The phosphorus compound preferably comprises phosphorous acid and/or a salt thereof. Most preferably it comprises a salt of phosphorous acid. ] 10 Preferably it comprises an alkali metal salt or an alkaline earth metal salt of phosphorous acid. Most preferably it comprises a potassium salt of phosphorous acid.
The salt of the phosphorous acid may comprise a monosubstituted and/or disubstituted phosphorous acid. Preferably it comprises a mixture of mono- and disubstituted phosphorous acid. Preferably it comprises a mixture of
KH,PO, and K,HPO,. Preferably the monosubstituted phosphorous acid is present in a larger molar amount than the disubstituted phosphorous acid.
Preferably the molar ratio between the mono and disubstituted phosphorous acid is from 4:1 to 3:1. Preferably it is about 3.3:1.
The salt of phosphorous acid may be prepared by reacting phosphorous acid with a suitable base. Preferably the base is added in such an amount to provide the solution at a pH suitable for foliar uptake. Usually this is at a pH from 5 about 5to about 7. Preferably the pH is from about 6 to 7. Most preferably the pH is about 6.5.
The salt may be prepared by first reacting phosphorous acid with a first base (such as potassium carbonate) and thereafter reacting it with another base (such as KOH). The first base may comprise a compound which does not include hydroxide, preferably it is a carbonate, and preferably it is an alkali metal carbonate. The other base may comprise a hydroxide containing compound, preferably an alkali metal hydroxide. The first base may be a weaker base than : the second base. It is believed that the addition of a salt such as potassium carbonate increases the solubility of the phosphorous acid salt. By using potassium carbonate to first react with phosphorous acid, a solubility of 550g/¢ phosphorous acid was obtained which is much higher than previous obtained concentrations.
The buffer may be prepared by mixing the organic base in the form of the nitrogen containing compound with an inorganic acid, preferably a mineral acid.
The nitrogen containing compound may comprise a heterocyclic compound containing at least one nitrogen atom as a ring member, preferably two nitrogen atoms as ring members. The ring may comprise from 5 to 6 members, but preferably it comprises 5 members. Preferably the heterocyclic compound is aromatic. In a most preferred embodiment of the invention the heterocyclic compound comprises imidazole. : 10
The mineral acid may comprise hydrochloric acid, sulphuric acid or nitric acid.
Preferably it comprises hydrochloric acid.
The buffer preferably buffers the solution at a pH suitable for foliar uptake.
Usually this is at a pH from about 5 to about 7. Preferably the pH is from about 6 to 7. Most preferably it is about 6.5.
The buffer comprising imidazole and its salt formed with hydrochloric acid is a very effective buffer and relatively small amounts of the buffer can be used.
The pH at which the solution is buffered can also be adjusted by adjusting the molar ratio of the imidazole and hydrochloric acid used to form the salt.
The organic base forming the buffer may be present at a concentration from 0,03 mol.dm™ to 0,07 mol.dm™ . Preferably from 0,045 mol.dm™ to 0,055 mol.dm?, and preferably about 0,05 mol.dm™.
A wetting agent may also be included in the phosphorus containing solution.
Additional plant nutrients, such as a source of nitrogen may also be added.
The nutrient may comprise urea, ammonium nitrate, potassium nitrate, magnesium nitrate, and calcium nitrate. It will be appreciated that the nitrogen containing base such as imidazole may also serve as a source of nitrogen.
The phosphorus containing solution may be for treating plants.
In one embodiment of the invention the phosphorus containing solution may be a fertiliser solution.
In another embodiment of the invention the phosphorus containing solution
Co WO 01/42169 PCT/ZA00/00178 may comprise a fungicide. Preferably it comprises a fungicide suitable for use against Oomycetes, preferably for use against Peronosporales, preferably for use against Phytophthora and Pythium species.
According to another aspect of the present invention there is provided a method of preparing a buffered phosphorus containing solution comprising the step of mixing together: - at least one phosphorus compound selected from the group consisting of phosphorous acid, hypophosphorous acid, polyphosphorous acid, polyhypophosphorous acid, and salts thereof; - water; and - an organic base in the form of a nitrogen containing compound and its conjugate acid to buffer the solution. 16 Preferably the phosphorus compound comprises a salt of phosphorous acid.
The salt of phosphorous acid may be prepared by reacting phosphorous acid with a suitable base. Preferably the base is added in such an amount to provide the solution at a pH suitable for foliar uptake. Usually this is at a pH from about 5 to about 7. Preferably the pH is from about 6 to 7. Most preferably the pH is about 6.5. The salt may be prepared by first reacting phosphorous
S : acid with a first base (such as potassium carbonate) and thereafter reacting it with another base (such as KOH). The first base may comprise a compound which does not include hydroxide, preferably it is a carbonate, and preferably it is an alkali metal carbonate. The other base may comprise a hydroxide containing compound, preferably an alkali metal hydroxide. The first base may be a weaker base than the second base. It is believed that the addition of a salt such as potassium carbonate increases the solubility of the phosphorous acid salt. The phosphorous acid may be reacted with the suitable base in the presence of water. : The invention also relates to the use of a phosphorus containing solution substantially as described hereinabove for treating plants or a locus especially a locus where plants are cultivated or to be cultivated. The solution may be used as a fungicide. Alternatively or additionally the solution may be used as afertiliser. The solution may be applied directly to the plants, for example by spraying the plants or by drenching their roots, but preferably by applying it to the foliage of the plants. The solution may also be injected into plant, preferably into the stems, of plants.
The invention also relates to a method of treating a plant or a locus comprising applying to the plant or locus a phosphorus containing solution substantially as described hereinabove.
The invention will now be further described by means of the following non- limiting examples:
Example 1
Preparation of Potassium Salt of Phosphorous Acid
Dry phosphorous acid (99% purity) in an amount of 563,89kg was mixed with dry potassium carbonate (99.5% purity) in an amount of 360kg. After mixing for about 15 minutes, 3338 of water was slowly added under stirring over a period of approximately 30 minutes. Potassium hydroxide (99% purity) in an amount of 200 kg was then added proportion-wise over a period of about 30 minutes.
Alternatively water in an amount of 330£ was placed in a container into which was added, with constant stirring, 110kg phosphorous acid (99% purity) followed by 70kg potassium carbonate (99.5% purity) followed by 40kg potassium hydroxide. This was repeated four times after which 123,89kg phosphorous acid was added followed by 80kg potassium carbonate followed by 40kg potassium hydroxide. According 563,89kg phosphorous acid, 360kg : potassium carbonate and 200kg potassium hydroxide was used.
A colorant in the form of Hexacol Acid Blue 9 in an amount of 10g was then dissolved in 20¢ of water and this solution was then added to the phosphorous acid solution. The colorant provides the solution with a light-blue colour to distinguish it from water.
Example 2
Preparation of Buffered Solution
Imidazole (99% purity) in an amount of 3,44kg was mixed with 30% aqueous hydrochloric acid (5,210 kg) and this mixture was added to the solution of example 1 to provide the buffered solution. The pH of the solution was 6.27 and the solution was stable.
Example 3
Comparison of Buffer Capacity between Imidazole Buffered Solution
According to the Invention and Citric Acid Buffered Solution
An amount of 100 ml of the imidazole buffered solution of example 2 was used. This buffer solution had a pH of 6,27 and a density of 1,4868g. cm”.
A citric acid buffered solution of phosphorous acid was prepared as set out in example 6 of US Patent 5,514,200. The following compounds in the amounts indicated were mixed together:
Phosphorous acid 34,987g
Citric acid (monohydrate) 10,168g
Potassium hydroxide 39,807g
Water added to total volume of 100ml.
The citric acid buffered solution had a pH of 5,71 and a density of 1,3749g.cm”.
The above two buffered solutions were then diluted as follows:
Solution (a) : 10ml of each undiluted buffer solution.
Solution (b) : 10ml of each buffer solution diluted with 10ml of distilled water (50% solution).
Solution (c) : 10ml of each buffer solution diluted with 40ml of distilled water (20% solution).
Solution (d) : 10ml of each buffer solution diluted with 90ml of distilled water (10% solution).
The diluted solutions were then titrated using a 1.0 M solution of sodium 6 hydroxide to determine their buffer capacities. Tables 1 and 2 provide the pH values obtained.
Table 1. pH of the solutions of Citric Buffer
MC of 1.0M NaOH
I I I I
I I
I I I
I a EC
I I I
IE cc HO
I SN
J cB ic
J a A
IE HO cl
I A I
EE EE
I
IE A
IE
J a I I
J Nc HI
FS I EN EN ll Nl
IE I
IE I
SS IC i Mall al
FY I Ml
SN Id Hall A
SY IC EN 0
IE El 0
IE Ec HY HO I
IE El Hc I
JE FN
HE EN A HO cl
IG I ch I
JE EN Bc
IE ca Wl
FS a
IE a FO Hcl
I 0 I A
I CH I
Ec EH A
IE 2 FN HO
FEL HO
I I
I I
IE cc
EE I A cc HH HO
Table 2. pH of the solutions of Imidazole Buffer
Mt of 1.0M NaOH
IE A
Claims (26)
1. A buffered phosphorus containing solution comprising at least one phosphorus compound selected from the group consisting of phosphorous acid, hypophosphorous acid, polyphosphorous acid, polyhypophosphorous acid, and salts thereof; and a buffer including an organic base in the form of a nitrogen containing compound and its conjugate acid.
2. The solution of claim 1 which is a concentrated solution containing from 2 mol.dm to 8 mol.dm” of the phosphorus compound.
3. The solution of claim 1 wherein the phosphorus compound comprises phosphorous acid and/or a salt thereof.
4. The solution of claim 3 wherein the phosphorus compound comprises an alkali metal salt or an alkaline earth metal salt of phosphorous acid.
5. The solution of claim 4 wherein the phosphorus compound comprises a potassium salt of phosphorous acid.
6. The solution of claim 5 which comprises a mixture of KH,PO; and K,HPO,.
7. The solution of claim 4 wherein the salt is the reaction product of phosphorous acid with a first base and a another base, the first base comprising a compound which does not include hydroxide and the other base comprising a hydroxide containing compound.
8. The solution of claim 7 wherein the first base comprises an alkali metal carbonate and the other base comprises an alkali metal hydroxide.
9. The solution of any one of the preceding claims wherein the nitrogen : containing compound comprises a heterocyclic compound containing at least one nitrogen atom as a ring member.
10. The solution of claim 9 wherein the heterocyclic compound comprises a ring with five members of which two are nitrogen atoms.
11. The solution of claim 10 wherein the heterocyclic compound comprises imidazole.
12. ‘The solution of claim 11 wherein the buffer is the reaction product of imidazole and a mineral acid.
13. The solution of claim 12 wherein the mineral acid comprises hydrochloric acid.
14. The solution of claim 13 which buffers the solution at a pH from about 5 to about 7.
15. ‘The solution of claim 1 which is a fertiliser solution.
16. The solution of claim 1 which is a fungicidal solution.
17. A method of preparing a buffered phosphorus containing solution comprising the step of mixing together: - at least one phosphorus compound selected from the group consisting of phosphorous acid, hypophosphorous acid, polyphosphorous acid, polyhypophosphorous acid, and salts thereof;
- water; and - an organic base in the form of a nitrogen containing compound and its conjugate acid to buffer the solution.
18. The method of claim 17 wherein the phosphorus compound comprises a salt of phosphorous acid and the salt being prepared by first reacting the phosphorous acid with a first base and thereafter reacting it with another base.
19. The method of claim 18 wherein the first base comprises a compound which does not include hydroxide and the other base comprises a hydroxide containing compound.
20. The method of claim 19 wherein the first base comprises an alkali metal carbonate and the second base comprises an alkali metal hydroxide.
21. The use of a solution of any one of claims 1 to 16 for treating plants or a locus.
22. The use of a solution of any one of claims 1 to 14 for fertilising plants or
© ‘WO 01/42169 PCT/ZA00/00178 a locus.
23. The use of a solution of any one of claims 1 to 14 for treating plants or a locus against fungus.
24. A method of treating plants or a locus comprising applying a solution of any one of claims 1 to 14 to the plants or locus.
25. ‘The method of claim 24 wherein the plants or locus are treated to fertilise the plants or locus.
26. The method of claim 24 wherein the plants or locus are treated against ’ fungus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA200203783A ZA200203783B (en) | 1999-12-10 | 2002-05-13 | Buffered phosporous containing solution. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA997596 | 1999-12-10 | ||
| ZA200203783A ZA200203783B (en) | 1999-12-10 | 2002-05-13 | Buffered phosporous containing solution. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| ZA200203783B true ZA200203783B (en) | 2003-02-26 |
Family
ID=27760812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| ZA200203783A ZA200203783B (en) | 1999-12-10 | 2002-05-13 | Buffered phosporous containing solution. |
Country Status (1)
| Country | Link |
|---|---|
| ZA (1) | ZA200203783B (en) |
-
2002
- 2002-05-13 ZA ZA200203783A patent/ZA200203783B/en unknown
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