CN108956853A - A kind of method that dichromate titration measures COD in water - Google Patents
A kind of method that dichromate titration measures COD in water Download PDFInfo
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- CN108956853A CN108956853A CN201810774998.9A CN201810774998A CN108956853A CN 108956853 A CN108956853 A CN 108956853A CN 201810774998 A CN201810774998 A CN 201810774998A CN 108956853 A CN108956853 A CN 108956853A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/16—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using titration
Abstract
The present invention relates to water body detection fields, more particularly to the method for COD in a kind of dichromate titration measurement water.The method of COD, for measurement chemical oxygen demand of water body, while considering that enterprise practical needs and combine relevant national standard in a kind of dichromate titration measurement water provided by the invention, make the result of acquisition is accurate, process simply and less pollution.
Description
Technical field
The present invention relates to water body detection fields, more particularly to COD in a kind of dichromate titration measurement water
Method.
Background technique
COD COD is the amount for chemically measuring the reducing substances for needing to be oxidized in water sample.Waste water gives up
In water treatment plant's water outlet and contaminated water, the oxygen equivalent for the substance (generally organic matter) that can be aoxidized by strong oxidizer.In river
In stream pollution and the operational management of industrial wastewater Quality Research and waste water treatment plant, it is that one important and energy is very fast
The organic pollution parameter of measurement, is often indicated with symbol COD.Oxidant used in general measure COD is potassium permanganate
Or potassium bichromate, the numerical value obtained using different oxidants are also different, it is therefore desirable to indicate detection method.In order to uniformly have
There are certain monitoring standard in comparativity, each state.
Summary of the invention
It is an object of the invention to: each enterprise implement mode of method of COD is not quite similar in measurement water, needs
Want method a kind of accurate and that pollution is small.
The present invention specifically uses following technical scheme to achieve the goals above:
A kind of method that dichromate titration measures COD in water comprising following steps:
Step 1: potassium bichromate standard solution, 10g silver sulfate and the 1L excellent pure grade sulfuric acid that preparation concentration is 0.025mol/L
The l ferrous ammonium sulfate solution that silver sulfate-sulfuric acid solution made from solution and concentration are 0.05mol/L；
Step 2: taking a water sample, sulphur described in potassium bichromate standard solution described in 5ml and 15ml is successively added into water sample
Sour silver-sulfuric acid solution, shakes up to obtain to test sample；
Step 3: taking a distilled water, weight described in silver sulfate-sulfuric acid solution described in 5ml and 5ml is successively added into sample
Potassium chromate standard solution shakes up to obtain blank sample；
Step 4: carrying out heating resolution to test sample and the blank sample for described respectively；
Step 5: utilizing the l ferrous ammonium sulfate solution to which indicator is added in test sample and the blank sample to described respectively
It is titrated；
When titrating to terminal, record is described to instill the l ferrous ammonium sulfate solution volume V in test sample respectively1With it is described
The l ferrous ammonium sulfate solution volume V is instilled in blank sample0；
Step 6: utilizing formulaCalculate COD in the water sample
The mass concentration of ρ；V is the volume of a water sample, the extension rate that f is water sample in the formula；
Step 7: to which frerrous chloride and sulfuric acid solution are added in test sample described in after to titration.
Further, the volume range of a water sample is 5-50ml.
Further, the indicator is ferroin indicator；When described to test sample and the blank sample solution colour
By ecliptic longitude it is bluish-green to bronzing when, as terminal.
Further, described to further include several anti-bumping beades in test sample and the blank sample.
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:
The method of COD in a kind of dichromate titration measurement water provided by the invention, for measurement water body chemical
Oxygen demand, while considering that enterprise practical needs and combine relevant national standard, makes that the result obtained is accurate, process is simple and pollutes
It is smaller.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, to the technology in the embodiment of the present invention
Scheme is clearly and completely described, it is clear that and described embodiments are some of the embodiments of the present invention, rather than whole
Embodiment.
Embodiment 1
The present embodiment considers that enterprise practical needs and combine national standard for measurement chemical oxygen demand of water body, obtains
Obtain the method that result is accurate, process is simple and a kind of dichromate titration of less pollution measures COD in water.
Specifically, method includes the following steps:
Step 1: potassium bichromate standard solution, 10g silver sulfate and the 1L excellent pure grade sulfuric acid that preparation concentration is 0.025mol/L
The l ferrous ammonium sulfate solution that silver sulfate-sulfuric acid solution made from solution and concentration are 0.05mol/L；
Step 2: taking a water sample, 5ml potassium bichromate standard solution and 15ml silver sulfate-sulfuric acid are successively added into water sample
Solution shakes up to obtain to test sample；
Step 3: taking a distilled water, 5ml silver sulfate-sulfuric acid solution and 5ml potassium bichromate mark are successively added into sample
Quasi- solution shakes up to obtain blank sample；
It should be noted that in specific implementation, step 2 and step 3 sequencing can change, can also simultaneously into
Row.
Step 4: heating resolution will be carried out to test sample and blank sample respectively；
Digestion time is heated according to the volume of water sample, is controlled at 5-10 minutes.
Step 5: indicator is added in test sample and blank sample respectively, is titrated using l ferrous ammonium sulfate solution；
When titrating to terminal, recorded respectively to instill l ferrous ammonium sulfate solution volume V in test sample1It is instilled in blank sample
L ferrous ammonium sulfate solution volume V0；
Step 6: utilizing formulaCalculate COD ρ in water sample
Mass concentration.Wherein, V is the volume of a water sample, the extension rate that f is water sample in formula.
Step 7: to after titration to which frerrous chloride and sulfuric acid solution are added in test sample.It will be to have toxicity in test sample with this
Hexavalent chrome reduction be trivalent chromium, reduce the pollution that generates to environment of waste liquid.
Specifically, in the present embodiment, the volume range of a water sample is 5-50ml.
Preferably, indicator is ferroin indicator；When bluish-green to red by ecliptic longitude to test sample and blank sample solution colour
When brown, as terminal.Color is intuitive and can react with l ferrous ammonium sulfate solution stabilization.
It further include several anti-bumping glass in test sample and blank sample to guarantee the safety and stability of heating resolution reaction
Pearl.
The method of COD in a kind of dichromate titration measurement water provided in this embodiment, for measurement water body
Learn oxygen demand, while considering that enterprise practical needs and combine relevant national standard, make the result obtained is accurate, process simply and dirt
It contaminates smaller.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (4)
1. a kind of method of COD in dichromate titration measurement water, which comprises the following steps:
Step 1: potassium bichromate standard solution, 10g silver sulfate and the 1L excellent pure grade sulfuric acid solution that preparation concentration is 0.025mol/L
The l ferrous ammonium sulfate solution that silver sulfate-sulfuric acid solution obtained and concentration are 0.05mol/L；
Step 2: taking a water sample, silver sulfate-described in potassium bichromate standard solution described in 5ml and 15ml is successively added into water sample
Sulfuric acid solution shakes up to obtain to test sample；
Step 3: taking a distilled water, dichromic acid described in silver sulfate-sulfuric acid solution described in 5ml and 5ml is successively added into sample
Potassium standard solution shakes up to obtain blank sample；
Step 4: carrying out heating resolution to test sample and the blank sample for described respectively；
Step 5: respectively to described to which indicator is added in test sample and the blank sample, being carried out using the l ferrous ammonium sulfate solution
Titration；
When titrating to terminal, record is described to instill the l ferrous ammonium sulfate solution volume V in test sample respectively1With the blank
The l ferrous ammonium sulfate solution volume V is instilled in sample0；
Step 6: utilizing formulaCalculate COD ρ in the water sample
Mass concentration；V is the volume of a water sample, the extension rate that f is water sample in the formula；
Step 7: to which frerrous chloride and sulfuric acid solution are added in test sample described in after to titration.
2. the method for COD in a kind of dichromate titration measurement water according to claim 1, it is characterised in that: institute
The volume range for stating a water sample is 5-50ml.
3. the method for COD in a kind of dichromate titration measurement water according to claim 1, it is characterised in that: institute
Stating indicator is ferroin indicator；When described bluish-green to bronzing by ecliptic longitude to test sample and the blank sample solution colour
When, as terminal.
4. the method for COD in a kind of dichromate titration measurement water according to claim 1, it is characterised in that: institute
It states to further include several anti-bumping beades in test sample and the blank sample.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109752481A (en) * | 2019-03-07 | 2019-05-14 | 安徽创新检测技术有限公司 | A kind of water quality bichromate measuring method |
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Application publication date: 20181207 |