AU632982B2 - - Google Patents
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- Publication number
- AU632982B2 AU632982B2 AU2054092A AU2054092A AU632982B2 AU 632982 B2 AU632982 B2 AU 632982B2 AU 2054092 A AU2054092 A AU 2054092A AU 2054092 A AU2054092 A AU 2054092A AU 632982 B2 AU632982 B2 AU 632982B2
- Authority
- AU
- Australia
- Prior art keywords
- cod
- water
- sample
- applicant
- dichromate
- 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.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 description 14
- 230000001590 oxidative effect Effects 0.000 description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 238000010561 standard procedure Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002505 iron Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000013206 minimal dilution Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- YPNVIBVEFVRZPJ-UHFFFAOYSA-L silver sulfate Chemical compound [Ag+].[Ag+].[O-]S([O-])(=O)=O YPNVIBVEFVRZPJ-UHFFFAOYSA-L 0.000 description 1
- 229910000367 silver sulfate Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
- G01N33/1806—Biological oxygen demand [BOD] or chemical oxygen demand [COD]
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Analytical Chemistry (AREA)
- Molecular Biology (AREA)
- Biomedical Technology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Medicinal Chemistry (AREA)
- Physics & Mathematics (AREA)
- Emergency Medicine (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Description
i I-CI~-WII~IC~"" P/00/012 -l,,AUSTRA.LIA PATENTS l T ,I PETTY PATENT S I C4TO
(ORIGINAL)
NOTICE
1. The specification should describe the invention in full, and the best method of performing it known to the applicant.
2. The specification should be typed on as many sheets of good quality A4 International size paper as are necessary. Inserted inside this form.
3. The specification should include on a separate page a single claim defining the invention. If there is insufficient space on this form for the claim, use separate sheets of paper. The words The claim defining the invention is as follows should appear before the claim. After the claim the date and the name of the applicant in block letters should appear.
4. This form must be accompanied by a true and exact copy of the description, claim and drawings (if any), and an additional copy of the claim.
(see formal requirements in the Guide for Applicants for Patents) ooo eoi oeo 0 0 eoa o o o o -a o o oo o so 0 $0 0 4i TO BE COMPLETED BY APPLICANT IAME OF APPLICANT ADDRESS OF APPLICANT ACTUAL INVENTOR ADDRESS FOR SERVICE Mark Rozenberg I405/200 Pitt St. Waterloo, NSW Mark Rozenberg 1405/200 Pitt St. Waterloo, NSW, 2017.
Petty Patent Specification for the invention entitled: The fast method of water COD determination.
The following statement is a full description of this invention, including the best method of performing it known to me:- The chemical oxygen demand (COD) parameter is used as a measure of the oxygen equivalent of a susceptible to oxidation by a strong chemical oxidant organic matter content in a sample of water. The COD parameter correlate with the biological oxygen demand, quantity of organic carbon or organic matter in water and this test is useful for monitoring and control, of the water quality.
The .dichromate method of determination of COD is preferred because of superior oxidizing ability and applicability IO to a wide variety of samples and ease of manipulation.
According to the "Standard Methods for the examination of water and wastewater, I7th edition,I989" the procedure of the reaction carrying out includes the stage of the heating during not less then two hours with the oxidation mixture for both recommended the reflux and semimicrotube methods. In both methods the solution of dichromate in the diluted sulfuric acid is used as an oxidizing mixture.
When implementing these methods the sample of water inevitably dilutes the oxidizing mixture even more.
20 It is well known that the' oxidizing ability of dichromate increases with increasing of the concentration of sulfuric acid that used as a component of an oxidizing mixture.
The proposed invention is characterized by use of the dichromate solution in the concentrated (95-97%) sulfuric acid, by minimal dilution of the oxidizing mixture by relatively small water sample and by 50-30 times shortened heat time. In the proposed method the sample is mixed with the oxidi 7 ing mixture and passed by pressure or vacuum through the column packed with inert particulated material at the temperature 150-I70°C.
-I-
In a working example the column was made from glass, had dimensions of 400 mm length and 8 mm in diameter; the quartz packing (particles 0,25-0,5 mesh) was used; the oxidizing mixture was the solution IO-2-IO-M) of potassium dichromate in 95-97% sulfuric acid with silver sulfate as a catalyst; the volume of the sample was 0,25-0,5 ml; the oxidizing mixture volume was 5-10 ml; the reaction time was about 3-5 minutes. The final step of the COD determination after the reaction was carryed out accordingly to the mentioned above "Standard Methods.' -by titration with the divalent iron salt solution or spectrophotometrically.
oe The proposed method was used many times and the results turned out absolutely the same as obtained by the standard (reflux) method (see table).
COD, g0/1 N wastewater proposed standard sample method method I 150±10 140-10 2 340±30 210±30 S3 5300±500 5400±500 4 2750±250 2500±300 2300±200 2250±250 .6 3018 abs.
The invention gives the new effective and very fast and easily automatized method of the COD determination.
-2-
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU20540/92A AU632982B3 (en) | 1992-07-23 | The fast method of water COD determination |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU20540/92A AU632982B3 (en) | 1992-07-23 | The fast method of water COD determination |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| AU2054092A AU2054092A (en) | 1993-01-14 |
| AU632982B2 true AU632982B2 (en) | 1993-01-14 |
| AU632982B3 AU632982B3 (en) | 1993-01-14 |
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Also Published As
| Publication number | Publication date |
|---|---|
| AU2054092A (en) | 1993-01-14 |
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