CN1052375A - A kind of COD measuring method without mercury - Google Patents
A kind of COD measuring method without mercury Download PDFInfo
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- CN1052375A CN1052375A CN 89109199 CN89109199A CN1052375A CN 1052375 A CN1052375 A CN 1052375A CN 89109199 CN89109199 CN 89109199 CN 89109199 A CN89109199 A CN 89109199A CN 1052375 A CN1052375 A CN 1052375A
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- chlorine
- mercury
- potassium dichromate
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Abstract
A kind of COD measuring method without mercury adopts quantitative measurement to be finished by the chlorine that potassium dichromate oxidation goes out, and does not add mercury salt, also need not to add a large amount of silver salt, this method promptly saves, easy, do not produce pollution again, and measure accurately, have economic benefit and environmental benefit concurrently.
Description
The present invention relates to a kind of chemistry in detecting, further is the mensuration to chemical oxygen demand (COD).
Measure at present chemical oxygen demand (COD) in the water sample and generally adopt potassium dichromate circumfluence method (measuring) with potassium dichromate oxidation organism required oxygen equivalent when the oxidation, and carry out catalysis as catalyzer with silver sulfate, because most of waste water is muriatic dense, potassium dichromate meeting chlorine monoxid ion, thereby, can produce and disturb the accuracy that influence is measured.In order to eliminate this interference, the general method that adopts is to add mercuric sulfate in water sample earlier, mercury ion and chlorion form a kind of light current from the mercuric chloride complex compound, when excessive mercury ion exists, chlorine ion concentration can be very low, so that potassium dichromate does not have oxidation to chlorion, (seeing " water and waste water standard test method " pp450 China Construction Industry Press publication of translations such as Song Ren unit).Because mercury salt is poisonous, and addition is very big, so the severe contamination water body, for this reason, the researcher is studying no mercury salt method always and is measuring chemical oxygen demand (COD) both at home and abroad.
People such as nineteen eighty-two Ballinger propose to add silver nitrate makes chloride form silver nitride precipitation, thereby eliminates the method for chloride ion interference.The same year, Llyd.A proposed to measure chemical oxygen demand (COD) with airtight flask, also was to add silver salt by heavy dose to suppress to disturb.People such as K.E.DE.CaSSereS in 1984 propose to suppress with the increasing silver sulfate dosage open pipe chemical oxygen demand (COD) determination method of chloride ion interference.More than these three kinds of methods all to consume the silver compound of mass expensive, and can not suppress the interference of chlorion fully, so generally do not adopted always.Domesticly do not see that as yet breakthrough report is arranged.
The purpose of this invention is to provide a kind of mercury salt that do not add, and can accurately measure the determination method of chemical oxygen demand (COD), and required device.
Chlorine that quantitative measurement gone out by the potassium dichromate chlorination finishes but solution of the present invention is based on.
At first in water sample, add a certain amount of silver sulfate, reduce chlorine ion concentration, and play catalytic action, add potassium dichromate again, oxidation of organic compounds and remaining chlorion are oxidized to chlorine with chlorion, use the chlorine gathering-device that chlorine is collected, measure the equivalents of chlorine.Be the used up potassium dichromate equivalents of chlorion, from the equivalents of used up potassium dichromate, deduct the equivalents of chlorine then, just can accurately record chemical oxygen demand (COD).
Below in conjunction with accompanying drawing the present invention is specifically described:
Accompanying drawing is a chlorine gathering-device synoptic diagram.
The present invention is finished by following steps.
1. add silver sulfate
Get 20 milliliters of waste water samples that mix (or an amount of wastewater dilution to 20 milliliter) in 250 milliliters of ground taper Backflow bottles, addend grain beaded glass or zeolite slowly add 30 milliliters of sulfuric acid-silver sulfate solutions, shake Backflow bottle gently, make solution even, place cold slightly.
2. add potassium dichromate
Accurately add 10 milliliters of 0.25N potassium dichromate standard solution.
3. chlorine reclaims
The gathering-device of chlorine is by recirculatory pipe 2, and emulsion tube 3 and two fritted glass disk bubblers 4 constitute, and wherein two fritted glass disk bubbler 4 serial connections respectively are equipped with 45 milliliters of left and right sides distilled water, and emulsion tube 3 is connected in series recirculatory pipe 2 and fritted glass disk bubbler 4.Recirculatory pipe 2 other ends are inserted in the aforesaid Backflow bottle 1, reflux 115 minutes to 2 hours, stop recirculation water, with water vapor the residual chlorine band of gas in Backflow bottle 1 and the recirculatory pipe 2 is gone into fritted glass disk bubbler 4, stop heating when hot slightly to first fritted glass disk bubbler 4, take off fritted glass disk bubbler 4 rapidly, measure the equivalents of chlorine (chlorine residue).
4. mensuration chemical oxygen demand (COD)
Measure residue potassium dichromate equivalents in the Backflow bottle 1 earlier, deduct residue potassium dichromate equivalents with the potassium dichromate equivalents that in Backflow bottle 1, adds, deduct the equivalents that the potassium dichromate oxidation chlorion is a chlorine (equivalents of chlorine in the fritted glass disk bubbler 4) again, be chemical oxygen demand (COD).
Adopt the present invention to measure chemical oxygen demand (COD), can remove the pollution of mercury from, also need not consume a large amount of silver salt, and measure accurately.
Claims (2)
1, a kind of COD measuring method without mercury, it is characterized in that: at first in water sample, add silver sulfate, add quantitative potassium dichromate again, use the chlorine gathering-device that chlorine is collected, measure the equivalents of chlorine, measure residue potassium dichromate equivalents in the water sample again.
2, determination method according to claim 1 is characterized in that: the chlorine gathering-device is by recirculatory pipe 2, and emulsion tube 3 and fritted glass disk bubbler 4 constitute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89109199 CN1052375A (en) | 1989-12-07 | 1989-12-07 | A kind of COD measuring method without mercury |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89109199 CN1052375A (en) | 1989-12-07 | 1989-12-07 | A kind of COD measuring method without mercury |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1052375A true CN1052375A (en) | 1991-06-19 |
Family
ID=4857902
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89109199 Pending CN1052375A (en) | 1989-12-07 | 1989-12-07 | A kind of COD measuring method without mercury |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1052375A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101446558B (en) * | 2008-12-23 | 2010-11-03 | 天津创业环保集团股份有限公司 | Digestion solution for monitoring chemical oxygen demand in sewage |
| CN101713739B (en) * | 2008-12-05 | 2012-07-04 | 江苏工业学院 | Reagent and method for determining chemical oxygen demand of high-chloride wastewater |
-
1989
- 1989-12-07 CN CN 89109199 patent/CN1052375A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101713739B (en) * | 2008-12-05 | 2012-07-04 | 江苏工业学院 | Reagent and method for determining chemical oxygen demand of high-chloride wastewater |
| CN101446558B (en) * | 2008-12-23 | 2010-11-03 | 天津创业环保集团股份有限公司 | Digestion solution for monitoring chemical oxygen demand in sewage |
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| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
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