CN205643150U - COD short -term test appearance - Google Patents
COD short -term test appearance Download PDFInfo
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- CN205643150U CN205643150U CN201620380755.3U CN201620380755U CN205643150U CN 205643150 U CN205643150 U CN 205643150U CN 201620380755 U CN201620380755 U CN 201620380755U CN 205643150 U CN205643150 U CN 205643150U
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- monochromator
- cod
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Abstract
The utility model provides a COD short -term test appearance, including light source, monochromator group, chopper, absorption cell, detector, the recording system who sets gradually, monochromator group is including 2 monochromators, the light source is used for launching two bundle at least light and organizes for the monochromator. The utility model provides a COD short -term test appearance, the solution muddiness need not filtered, COD content is at 15~1000mgL (15~150mgL and 100~1000mgL), and it only needs a concentration to clear up test solution K2Cr2O7, and the COD detector is a range only, makes its operation more convenient, avoid muddy liquid filter with the unknown digestion solution concentration selection of COD content by mistake and reform, can save time and reagent.
Description
Technical field
This utility model relates to a kind of detector, particularly relates to a kind of COD fast detector.
Background technology
The mensuration of COD (chemical oxygen demand, COD) is divided into two
Step, the first step is clearing up of water sample, and second step is the mensuration of residual gravity Neutral potassium chromate.Second
The mensuration of step residual gravity Neutral potassium chromate has three kinds of methods, and first method is GB 11914-1989
Using Ferrous ammonium sulfate standard solution to return to drip, reagent dosage is big；Second method coulomb drips
Determine method；The third method is rapid-digestion spectrophotography HJ/T 399-2007.On the market
The most COD detectors design based on method three, according to COD content not
With being divided into high range and lower range, COD selects high range, choosing 100～1000mg/L
With c (1/6K2Cr2O7)=0.500mol/L, measures and measures at wavelength 600nm ± 20nm
Cr3+The increase of absorbance；COD selects lower range 15～150mg/L, selects c (1/6
K2Cr2O7)=0.120mol/L, measures total reduction of wavelength 440nm ± 20nm absorbance.
Existing COD detector mostly designs according to HJ/T 399-2007, and defect shows as COD
Content difference clears up reagent K2Cr2O7Concentration is different；COD detector selects gear " high range "
" lower range "；If sample solution is muddy or has precipitation, after needing centrifugal change clearly, use COD again
Detector measures.Owing to not knowing COD scope before measuring, select to clear up reagent K2Cr2O7Dense
It is the most right to spend, and also needs to reform.Due to instrument design, use easy not.
Fig. 1 is prior art COD detector structure chart, as it is shown in figure 1, when COD is dense
Spend 100～1000mg/L, c (1/6K2Cr2O7)=0.500mol/L (different manufacturers special
May be different by the concentration of reagent), select high range, K2 closes, and K1 is open-minded, and light source is sent out
The light gone out arrives monochromator 1 through K1, obtains the monochromatic light of wavelength 610nm ± 2nm, through inhaling
Reach detector 1 after receiving pond 1 absorption and detect K2Cr2O7Reduzate Cr3+The increase of absorbance
Measure COD；When COD concentration selects lower range 15～150mg/L, select c (1/6
K2Cr2O7)=0.120mol/L (concentration of the special agent of different manufacturers may be different), choosing
Selecting lower range, K1 closes, and K2 is open-minded, and the light that light source sends arrives monochromator 2 through K2,
Obtain the monochrome of wavelength 420nm ± 2nm, owing to using the detector of this light path design, belong to
In monochromatic light road, it is necessary to be that homogeneous system measures, if homogeneous system ie in solution muddiness is not necessary
Centrifugal liquid is measured after Li Xin；COD content is different, clears up use K2Cr2O7Concentration is different,
COD measures and selects range different, if selecting improper, evaluated error is the biggest.
If sample solution is muddy or has precipitation, centrifuge is needed to use light splitting light again after becoming clearly
Degree meter measures.Due to instrument design, use easy not.
Utility model content
The purpose of this utility model is to solve the defect that above-mentioned prior art exists, it is provided that
A kind of solution muddiness is not required to filter the fast detector that just can measure COD.
A kind of COD fast detector, including the light source set gradually, monochromator group, cuts
Light device, absorption cell, detector, record system；Described monochromator group includes 2 monochromes
Device；
Described light source is used for launching two-beam line to monochromator group；
Described monochromator group is for decomposing the list that two-beam line is required wavelength that light source is launched
Coloured light；
Described chopper is for by two monochromic beams of monochromator group with certain frequency alternately
Pass through absorption cell；
It is single through two bundles of chopper that described absorption cell clears up water sample alternately absorption for splendid attire
Coloured light；
Described detector is for measuring the digestion solution difference to two monochromic beam absorbances；
Described record system is for recording the testing result of detector.
Further, COD fast detector as above, described monochromator group includes
Monochromator 1 and monochromator 2, described monochromator 1 provides analyzes wavelength X1For 443nm ± 2
nm；Described monochromator 2 provides reference wavelength λ2For 552nm ± 2nm.
The COD fast detector that this utility model provides, solution muddiness is not required to filter；COD
Content at 15～1000mg/L (15～150mg/L and 100～1000mg/L),
Clear up test solution K2Cr2O7Only need a kind of concentration, a kind of range of COD detector so that it is
More convenient to operate, it is to avoid turbid solution filters and COD content the unknown digestion solution concentration choosing mistake
And reform, time and reagent can be saved.
Accompanying drawing explanation
Fig. 1 is prior art COD detector structure chart；
Fig. 2 is this utility model COD fast detector structure chart.
Detailed description of the invention
For making the purpose of this utility model, technical scheme and advantage clearer, below this
Technical scheme in utility model is clearly and completely described, it is clear that described
Embodiment is a part of embodiment of this utility model rather than whole embodiments.Based on
Embodiment in this utility model, those of ordinary skill in the art are not making creativeness
The every other embodiment obtained under work premise, broadly falls into this utility model protection
Scope.
As in figure 2 it is shown, the COD fast detector that this utility model provides, including successively
The light source of setting, monochromator group, chopper, absorption cell, detector, record system；
Described monochromator group includes at least 2 monochromators；
Described light source is used for launching two-beam line to monochromator group；
Described monochromator group is for decomposing the list that two-beam line is required wavelength that light source is launched
Coloured light；
Described chopper is for by two monochromic beams of monochromator group with certain frequency alternately
Pass through absorption cell；
It is single through two bundles of chopper that described absorption cell clears up water sample alternately absorption for splendid attire
Coloured light；
Described detector is for measuring the digestion solution difference to two monochromic beam absorbances；
Described record system is for recording the testing result of detector.
Described monochromator group includes monochromator 1 and monochromator 2, and described monochromator 1 provides and divides
Analysis wavelength X1For 443nm ± 2nm；Described monochromator 2 provides reference wavelength λ2For
552nm±2nm。
Operation principle:
The present invention uses double-wavelengh technique, index path to see Fig. 2.The light that light source emits divides
Becoming two bundles, respectively through monochromator 1 and monochromator 2, monochromator 1 provides analyzes light beam wavelength
For λ1443nm ± 2nm, monochromator 2 provides reference beam wavelength to be λ 2 552nm ± 2
nm.By chopper, make analysis light beam and reference beam with certain frequency alternately through suction
Receiving pond, detector display test solution is to analyzing wavelength X 1 and the absorbance difference of reference wavelength λ 2
ΔA。
The advantage of the method maximum is the interference that the scattering occurred because of coexisting substances in sample causes
Can be eliminated, therefore sample muddiness or precipitation etc. cause scattering of light automatically to eliminate,
Need not filter；The impact brought because of the fluctuation of the intensity of light source can also be eliminated；Sample solution and
Reference solution is with a, can eliminate because absorption cell does not mates, reference solution is molten with sample
The error that the composition difference etc. of liquid causes.
It is last it is noted that above example is only in order to illustrate the technical solution of the utility model,
It is not intended to limit；Although this utility model being described in detail with reference to previous embodiment,
It will be understood by those within the art that: it still can be to described in foregoing embodiments
Technical scheme modify, or wherein portion of techniques feature is carried out equivalent；And this
A little amendments or replacement, do not make the essence of appropriate technical solution depart from this utility model and respectively implement
The spirit and scope of example technical scheme.
Claims (2)
1. a COD fast detector, it is characterised in that include light source, the monochrome set gradually
Device group, chopper, absorption cell, detector, record system；Described monochromator group includes 2 monochromes
Device；
Described light source is used for launching two-beam line to monochromator group；
Described monochromator group is for decomposing the monochromatic light that two-beam line is required wavelength that light source is launched；
Described chopper for by two monochromic beams of monochromator group with certain frequency alternately through suction
Receive pond；
Described absorption cell clears up water sample alternately absorption through two monochromic beams of chopper for containing；
Described detector is for measuring the digestion solution difference to two monochromic beam absorbances；
Described record system is for recording the testing result of detector.
COD fast detector the most according to claim 1, it is characterised in that described monochrome
Device group includes monochromator 1 and monochromator 2, and described monochromator 1 provides analyzes wavelength X1For 443nm ± 2
nm；Described monochromator 2 provides reference wavelength λ2For 552nm ± 2nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620380755.3U CN205643150U (en) | 2016-04-28 | 2016-04-28 | COD short -term test appearance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620380755.3U CN205643150U (en) | 2016-04-28 | 2016-04-28 | COD short -term test appearance |
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| Publication Number | Publication Date |
|---|---|
| CN205643150U true CN205643150U (en) | 2016-10-12 |
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| CN201620380755.3U Active CN205643150U (en) | 2016-04-28 | 2016-04-28 | COD short -term test appearance |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106248472A (en) * | 2016-10-13 | 2016-12-21 | 乐山师范学院 | A kind of COD clears up the method that instrument measures the soil organism |
| CN109406426A (en) * | 2018-11-22 | 2019-03-01 | 北京城市排水集团有限责任公司 | Total phosphorus reagent in a kind of quickly measurement sewage, and its preparation method and application |
| CN113884451A (en) * | 2021-09-27 | 2022-01-04 | 乐山师范学院 | Method for measuring chemical oxygen demand in high-chlorine water |
-
2016
- 2016-04-28 CN CN201620380755.3U patent/CN205643150U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106248472A (en) * | 2016-10-13 | 2016-12-21 | 乐山师范学院 | A kind of COD clears up the method that instrument measures the soil organism |
| CN109406426A (en) * | 2018-11-22 | 2019-03-01 | 北京城市排水集团有限责任公司 | Total phosphorus reagent in a kind of quickly measurement sewage, and its preparation method and application |
| CN113884451A (en) * | 2021-09-27 | 2022-01-04 | 乐山师范学院 | Method for measuring chemical oxygen demand in high-chlorine water |
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