CN110095457A - A kind of the measurement test paper and rapid assay methods of chlorine residue - Google Patents
A kind of the measurement test paper and rapid assay methods of chlorine residue Download PDFInfo
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- CN110095457A CN110095457A CN201910308679.3A CN201910308679A CN110095457A CN 110095457 A CN110095457 A CN 110095457A CN 201910308679 A CN201910308679 A CN 201910308679A CN 110095457 A CN110095457 A CN 110095457A
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- test paper
- chlorine residue
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- measurement test
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N2021/7756—Sensor type
- G01N2021/7759—Dipstick; Test strip
Abstract
The invention discloses the measurement test paper and rapid assay methods of a kind of chlorine residue.The measurement test paper of this chlorine residue is made by preparation method below: 1) color developing agent, catalyst, stabilizer and pH adjusting agent being dissolved in solvent, preparation obtains mixed liquor；2) filter paper is impregnated in mixed liquor, is taken out, it is dry, it cuts, is pasted on substrate.The present invention also provides a kind of rapid assay methods of chlorine residue, include the following steps: to immerse chlorine residual measurement test paper in sample to be tested, be taken out after 10 seconds~15 seconds, wait develop the color completely, test paper is subjected to color with standard color comparison card and is compared, the contents of residual chlorine in sample is measured.The chlorine residue detection method that the present invention provides a kind of color ranges is obvious, stability is good, specificity is good, easy to operate, economical and practical, this method response time is fast, about 15 seconds, the content of minimum detectable chlorine residue was 0.1mg/L, the monitoring of residual chlorine concentration suitable for disinfecting process.
Description
Technical field
The invention belongs to chemical analysis technology fields, and in particular to a kind of the measurement test paper and rapid assay methods of chlorine residue.
Background technique
The various industries for being related to water will usually carry out disinfection to water, common disinfectant have liquid chlorine, sodium hypochlorite, chloramines,
Chlorine dioxide, ozone, ultraviolet light etc..For Disinfection Effect and disinfection safety, chlorine dioxide and ozone are superior to liquid chlorine, but
For the chlorine-containing disinfectants such as liquid chlorine and sodium hypochlorite because low in cost, bactericidal effect is lasting, is at present at home still dosage maximum one
Class disinfectant is widely used in the disinfection of the water quality such as Drinking Water, industrial wastewater, sanitary sewage, swimming-pool water.Chlorine residue refers to water
Matter (including Cl of remaining free chlorine residual in water after chlorine-containing disinfectant sterilizes2、ClO-, HClO) and combined residual chlorine (monochloro amine,
Dichlormaine, three chloramines) general name.
The disinfection that must reach certain during water disinfection uses concentration, and guarantees that certain residual concentration can just make to kill
Bacterium function and effect are efficiently, persistently.But excessive concentration then will lead to the increase of production cost, or to site operation personnel's
Body damages.Therefore, it is very necessary for being monitored to disinfectant residual concentration in water after disinfecting process and disinfection.
The standard method of test of free chlorine residual has N, N- in GB5750.11-2006 " Drinking Water water examination method "
Diethyl p-phenylenediamine (abbreviation DPD) spectrophotometry and tetramethyl benzidine colorimetric method.Wherein DPD method is soluble in because of reagent
Water develops the color sensitive, and the range of linearity is wide and is generally used in the world.The colour developing principle of DPD method is: pH be 6.2~6.5 and
Under the conditions of screening agent is existing, free chlorine residual is directly with DPD reagent colour development, and the depth of color and the content of free chlorine residual are at just
Than；Under the catalytic action of potassium iodide, combined residual chlorine can also be with DPD reagent colour development, and free chlorine residual and combined residual chlorine are same
When measure, shade is directly proportional to the content of total residual chlorine.
The content of chlorine residue is influenced and very unstable by temperature, light intensity and various reducing agents in water, so, scene
Being measured by sampling just has authenticity.Operating process it is cumbersome or need the laboratory determination method of large-sized analytic instrument it is unfavorable on site
Quickly measurement.Therefore, the research and commercialization of chlorine residue field fast detection method will have biggish realistic meaning in water.
Currently, quickly testing product form is other than sensor and reagent both at home and abroad, there are also test paper methods.Sensor and ampoule
The price of bottle is all more expensive, and is also required to cooperation and is used together.Common measurement reagent is also required to cooperation colorimetric bottle and colorimetric
Card is used together, and the domestic many package encapsulations of product are not very well, and reagent is apt to deteriorate.There are also one is directly use
Test paper method measurement, but domestic universal product stability is all very poor, the shelf-life is short, and measurement sensitivity is relatively low, is difficult to accord with
Close the requirement of on-site test.
In the prior art, CN1425917A discloses a kind of manufacturing method of chlorine residue test paper, and the sensitivity of this method can only
Reach 1mg/L, sensitivity is low, is not suitable for the fields such as swimming-pool water, drinking water, tap water.CN102937579A discloses one kind
Water quality free chlorine residual fast-field evaluation tablet, although this method test is sensitive, insufficient place be exactly operating procedure compared with
It is cumbersome, it needs to roll reagent with tool and makes it completely dissolved, dissolution is also required to certain time, when especially temperature is lower, sometimes
It waits dissolution time to need to reach 2 minutes or more, extends the testing time.This method measurement range is relatively narrow, only up to test
3mg/L needs dilution metering if high sample again if surveying concentration, and application range is subject to certain restrictions.Thus, current water
Matter chlorine residue detection method improves there is still a need for further.
Summary of the invention
In order to overcome the problems, such as that water quality chlorine residue field fast detection method exists in the prior art, an object of the present invention
It is to provide a kind of measurement test paper of chlorine residue, the second object of the present invention is to provide a kind of rapid assay methods of chlorine residue.
It is found by the present inventor's numerous studies, joined straight-chain alkyl sulfate, benzene sulfonic acid in chlorine residual measurement test paper
The anionic surfactants such as salt can play the role of electronics transfer as catalyst, improve the sensitivity of test, so that
0.1mg/L can also reached with test paper method measurement sensitivity；On the other hand, joined sodium molybdate, sodium tungstate, these contain filtering
The ionic compound of metal can make aniline or the derivative of phenol vulnerable to dioxygen oxidation, not extend and produce as stabilizer
The shelf-life of product.
In order to achieve the above purpose, the technical solution used in the present invention is:
The present invention provides a kind of measurement test paper of chlorine residue, it is made by preparation method below:
1) color developing agent, catalyst, stabilizer and pH adjusting agent are dissolved in solvent, preparation obtains mixed liquor；
2) filter paper is impregnated in mixed liquor, is taken out, it is dry, it cuts, is pasted on substrate, obtain the measurement examination of chlorine residue
Paper；
In the mixed liquor, the concentration of color developing agent is 1g/L~10g/L, and the concentration of catalyst is 3g/L~15g/L, is stablized
The concentration of agent is 0.5g/L~3g/L, and the concentration of pH adjusting agent is 10g/L~50g/L；Wherein, catalyst is living for anionic surface
Property agent；Stabilizer is the ionic compound containing filtering metal.
Preferably, in the measurement test paper of this chlorine residue, color developing agent in phenol derivatives, anil at least one
Kind；It is further preferred that color developing agent be selected from o-nitrophenol, para-aminophenol, p-nitrophenol, salicylic acid, 3,3', 5,5'-
At least one of tetramethyl benzidine, ortho-nitraniline, o-tolidine；Still further preferably, color developing agent is selected to right
Amino-phenol, nitrophenol, salicylic acid, 3,3', at least one of 5,5'- tetramethyl benzidine.
Preferably, in the measurement test paper of this chlorine residue, catalyst is selected from the straight-chain alkyl sulfate surface of carbon atom number >=8
At least one of activating agent, benzene sulfonate surfactant；It is further preferred that catalyst is selected from octyl sodium sulfonate, ten
At least one of dialkyl benzene sulfonic acids sodium, NaLS, sodium cetanesulfonate.
Preferably, in the measurement test paper of this chlorine residue, stabilizer in alkali metal molybdate, alkali tungstates extremely
Few one kind；It is further preferred that stabilizer is selected from least one of sodium molybdate, sodium tungstate.
Preferably, in the measurement test paper of this chlorine residue, pH adjusting agent is solid acid；It is further preferred that pH adjusting agent is selected
From at least one of sulfamic acid, malonic acid, ethylenediamine tetra-acetic acid, 2- nitrobenzoic acid.
Preferably, in the measurement test paper of this chlorine residue, the pH value of mixed liquor is adjusted less than 2 in pH adjusting agent.
Preferably, the preparation step 1 in the measurement test paper of this chlorine residue) in, solvent is selected from methanol, ethyl alcohol, propyl alcohol, isopropyl
One of alcohol, acetone, water are a variety of；It is further preferred that solvent is selected from or mixtures thereof one of ethyl alcohol, water；Again into
One step is preferred, and solvent is selected from the mixture that second alcohol and water is formed with volume ratio 9:1.
Preferably, the preparation step 2 of the measurement test paper of this chlorine residue) in, filter paper is selected from chromatography filter paper, qualitative filter paper, determines
Measure the one of which in filter paper；It is further preferred that filter paper is chromatography filter paper.
Preferably, the preparation step 2 of the measurement test paper of this chlorine residue) in, the time of immersion is 5min~30min；Into one
Step is preferred, and the time of immersion is 10min.
Preferably, the preparation step 2 of the measurement test paper of this chlorine residue) in, it is dry to refer to that vacuum is dry at not higher than 50 DEG C
It is dry, drying forming.
Preferably, the preparation step 2 of the measurement test paper of this chlorine residue) in, it cuts and refers to filter paper is cut into 25mm2~
100mm2Fritter.
Preferably, the preparation step 2 of the measurement test paper of this chlorine residue) in, substrate is that can hold formula bottom plate；The shape of bottom plate is
Strip, preferred width are 5mm~10mm, and length is 50mm~120mm；Bottom plate is made of the plastic plate not absorbing water.
Preferably, the preparation step 2 of the measurement test paper of this chlorine residue) in, it is pasted onto and refers on substrate by the filter after cutting
Paper can hold one end of formula strip bottom plate with being adhesive in；It is further preferred that being specifically the fritter that filter paper is cut into 5mm × 6mm, use
Sticker is in one end of 5mm × 80mm strip bottom plate.
The present invention provides a kind of rapid assay methods of chlorine residue, include the following steps: above-mentioned chlorine residual measurement test paper
It immerses in sample to be tested, is taken out after 10 seconds~15 seconds, wait develop the color completely, test paper is subjected to color with standard color comparison card and is compared, is surveyed
Determine the contents of residual chlorine in sample.
Preferably, in the rapid assay methods of this chlorine residue, chlorine residual measurement test paper is immersed in sample to be tested, is taken after 15 seconds
Out.
Preferably, in the rapid assay methods of this chlorine residue, standard color comparison card the preparation method is as follows:
1) with pure water, compound concentration is 0.1mg/L, 0.5mg/L, 1mg/L, 3mg/L, 5mg/L, 7mg/L, 10mg/L respectively
Chlorine residue standard solution；
2) chlorine residual measurement test paper is immersed in each chlorine residue standard solution, is taken out after 10 seconds~15 seconds, wait develop the color completely, in Pan
Corresponding reference colour is found out on logical colour atla；
3) standard color comparison card is made according to the color value of each reference colour.
Preferably, in the preparation method step 2) of this standard color comparison card, chlorine residual measurement test paper is immersed into each chlorine residue standard
In solution, taken out after 15 seconds.
The beneficial effects of the present invention are:
The present invention provides a kind of color ranges, and chlorine residue obvious, that stability is good, specificity is good, easy to operate, economical and practical is examined
Survey method, this method response time is fast, and about 15 seconds, the content of minimum detectable chlorine residue was 0.1mg/L, is suitable for disinfecting process
The monitoring of middle residual chlorine concentration.
Specifically, compared with prior art, the present invention has the advantage that
1, stabilizer in test paper used in the method for the present invention is protected from light closed preservation at room temperature, and the shelf-life at least may be used
Reach 12 months.
2, the area of test paper of the present invention is small, and single test agent dosage only has more than one the percent of usual laboratory methods,
And test process is simple, is not necessarily to Other Instruments and accessory, can greatly save testing cost.
3, test paper holds formula bottom plate and can prevent pollution during taking by manpower, fool proof reliable.
4, detection range of the present invention is wide, is suitable for food and drink, scientific research, drinking water, swimming-pool water, aquaculture, environment prison
Survey the measurement of the residual chlorine concentrations such as waste water.
Detailed description of the invention
Fig. 1 is the view of standard color comparison card 1#.
Specific embodiment
The contents of the present invention are described in further detail below by way of specific embodiment.Original used in embodiment
Material unless otherwise specified, can be obtained from routine business approach.
Chlorine residual measurement test paper embodiment 1
It is prepared with 90% ethanol solution (volume ratio of second alcohol and water is 9:1) and contains 10.0g/L3,3,5,5 ,-tetramethyl connection
Aniline, 14.2g/L octyl sodium sulfonate, 0.65g/L sodium tungstate, 20g/L sulfamic acid mixing developing solution.Chromatography filter paper is complete
Complete immersion takes out filter paper, is dried in vacuo at 50 °C into above-mentioned mixed liquor 10 minutes.This filter paper is cut into 5 after drying
The fritter of × 6mm is made chlorine residue and is quickly measured test paper 1# with the bottom plate one end for being adhesive in 5 × 80mm strip.
Chlorine residual measurement test paper embodiment 2
P-nitrophenol containing 5.5g/L, 9.8g/L are prepared with 90% ethanol solution (volume ratio of second alcohol and water is 9:1)
NaLS, 1.1g/L sodium molybdate, 45.5g/L malonic acid mixing developing solution.Chromatography filter paper is completely soaked to above-mentioned
10 minutes in mixed liquor, filter paper is taken out, is dried in vacuo at 50 °C.This filter paper is cut into the fritter of 5 × 6mm after drying,
With the bottom plate one end for being adhesive in 5 × 80mm strip, that is, chlorine residue is made and quickly measures test paper 2#.
Chlorine residual measurement test paper embodiment 3
Para-aminophenol containing 6.5g/L, 4.4g/L are prepared with 90% ethanol solution (volume ratio of second alcohol and water is 9:1)
Sodium cetanesulfonate, 0.65g/L sodium tungstate, 1.2g/L sodium molybdate, 10.0g/L ethylenediamine tetra-acetic acid, 10g/L sulfamic acid
Mix developing solution.Chromatography filter paper is completely soaked into above-mentioned mixed liquor 10 minutes, filter paper is taken out, vacuum is dry at 50 °C
It is dry.This filter paper is cut into the fritter of 5 × 6mm after drying, with the bottom plate one end for being adhesive in 5 × 80mm strip, that is, it is fast that chlorine residue is made
Speed measurement test paper 3#.
Chlorine residual measurement test paper embodiment 4
Salicylic acid containing 7.8g/L, 6.9g/L 12 are prepared with 90% ethanol solution (volume ratio of second alcohol and water is 9:1)
Sodium alkyl benzene sulfonate, 1.1g/L sodium tungstate, 1.6g/L sodium molybdate, 12.5g/L2- nitrobenzoic acid, 12g/L sulfamic acid it is mixed
Close developing solution.Chromatography filter paper is completely soaked into above-mentioned mixed liquor 10 minutes, filter paper is taken out, vacuum is dry at 50 °C
It is dry.This filter paper is cut into the fritter of 5 × 6mm after drying, with the bottom plate one end for being adhesive in 5 × 80mm strip, that is, it is fast that chlorine residue is made
Speed measurement test paper 4#.
Standard color comparison card embodiment
Preparation quickly measures the matching used standard color comparison card 1# of test paper 1# with chlorine residue.
1) the chlorine residue acid standard solution for being 0.1mg/L with pure water compound concentration, prepared by chlorine residual measurement test paper embodiment 1
Test paper immerses in solution, takes out after 15 seconds, gets rid of extra solution, is found out in pantone according to the color that test paper is presented
The consistent reference colour of tone；
2) with step 1) the method, obtain respectively detectable concentration be 0.5mg/L, 1.0mg/L, 3.0mg/L, 5.0mg/L,
The reference colour that test paper is presented when the chlorine residue standard solution of 7.0mg/L, 10.0mg/L；
3) color value according to listed by obtained each Pan logical reference colour obtains standard color comparison card 1# using computer color-mixed and printing.
In standard color comparison card 1#, concentration 0.1mg/L, 0.5mg/L, 1mg/L, 3mg/L, 5mg/L, 7mg/L, 10mg/L's
The corresponding pantone color number of chlorine residue standard solution be respectively 7436CP, 7437CP, 7438CP, 7439CP, 686C, 474C,
1215C.The visible attached drawing 1 of the view of standard color comparison card 1#.
The preparation method of similar above-mentioned standard color comparison card, is prepared matching used with Test paper 2#~4# respectively
Standard color comparison card 2#~4#.
Test case 1
Chlorine residue is quickly measured to test paper 1#~4# to be placed in sealing bag, is placed in 37 DEG C of baking ovens, is tried every observation in 30 days
Paper appearance carries out test paper stability test and color developing effect test.
Color developing effect test method are as follows: be respectively configured 0.1mg/L, 0.5mg/L, 1.0mg/L, 3.0mg/L, 5.0mg/L,
The chlorine residue standard solution of 7.0mg/L, 10.0mg/L, test paper 1#, 2#, 3#, 4# are inserted into respectively in above-mentioned standard solution, after 15 seconds
Take out, get rid of solution extra on test paper, observe color developing effect after developing the color completely, and respectively with matched standard color comparison card pair
According to obtaining chlorine residue data.With the increase of contents of residual chlorine, the color that test paper is shown first by white gradually purpling, then turns yellow.Inspection
Result is surveyed as shown in table 1~4.
1 chlorine residue of table quickly measures the stability of test paper 1#
| Test index | After placing 30d | After placing 60d | After placing 90d |
| Appearance | White | White | White |
| Color range | Obviously | Obviously | Obviously |
| Color speed | Colour developing in about 15 seconds is complete | Colour developing in about 15 seconds is complete | Colour developing in about 16 seconds is complete |
2 chlorine residue of table quickly measures the stability of test paper 2#
| Test index | After placing 30d | After placing 60d | After placing 90d |
| Appearance | White | White | White |
| Color range | Obviously | Obviously | Obviously |
| Color speed | Colour developing in about 15 seconds is complete | Colour developing in about 15 seconds is complete | Colour developing in about 16 seconds is complete |
3 chlorine residue of table quickly measures the stability of test paper 3#
| Test index | After placing 30d | After placing 60d | After placing 90d |
| Appearance | White | White | White |
| Color range | Obviously | Obviously | Obviously |
| Color speed | Colour developing in about 16 seconds is complete | Colour developing in about 16 seconds is complete | Colour developing in about 17 seconds is complete |
4 chlorine residue of table quickly measures the stability of test paper 4#
| Test index | After placing 30d | After placing 60d | After placing 90d |
| Appearance | White | White | White |
| Color range | Obviously | Obviously | Obviously |
| Color speed | Colour developing in about 17 seconds is complete | Colour developing in about 18 seconds is complete | Colour developing in about 19 seconds is complete |
Test result showed the response time that chlorine residue is detected with test paper of the present invention less than 20 seconds, and color can after developing the color completely
Stablize 30 minutes.
By table 1~4 it is found that the chlorine residue in Examples 1 to 4 quickly measures after test paper places 90 days in 37 DEG C of baking ovens, remove
Color speed is slightly slack-off outer, other do not influence.By this shelf-life Acceleration study it is found that used in the method for the present invention
The room temperature shelf-life of test paper at least can reach 1 year.
Test case 2
The water sample containing chlorine residue is carried out using test paper 1# prepared by embodiment 1 test and oppose with the result of colorimeter
Than.When tone after sample colour developing is consistent with standard color range, directly taking color range instruction concentration is measured value, if at shade
Between two color ranges, then taking the intermediate concentration of two color ranges instruction concentration is measured value.Colorimeter method is former with the colour developing of DPD method
Reason, measures specific value on colorimeter after colour developing, finally carry out mark-on verifying.
Actual sample test result is as shown in table 5.In table 5: sample 1 is Guangzhou somewhere tap water；Sample 2 is certain cell
Swimming pool swimming-pool water；The chlorine residue thimerosal that sample 3 is prepared when being certain Soft Drinks Plant's sterilizing equipment decontaminating apparatus；Sample 4 is Guangzhou Grade A hospital
Waste discharge.
The test of 5 actual sample of table and the comparative experiments with other methods
By above-mentioned test result it is found that the method for the present invention is used to be not necessarily to using the measurement of residual chlorine concentration, the detection method
Other instruments and accessory, it is easy to operate, detection sensitivity is high, as a result reliably, practical value with higher.It is particularly suitable for
The detection of residual chlorine concentration in disinfecting process.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (10)
1. a kind of measurement test paper of chlorine residue, it is characterised in that: be made by preparation method below:
1) color developing agent, catalyst, stabilizer and pH adjusting agent are dissolved in solvent, preparation obtains mixed liquor；
2) filter paper is impregnated in mixed liquor, is taken out, it is dry, it cuts, is pasted on substrate, obtain the measurement test paper of chlorine residue；Institute
It states in mixed liquor, the concentration of color developing agent is 1g/L~10g/L, and the concentration of catalyst is 3g/L~15g/L, and the concentration of stabilizer is
0.5g/L~3g/L, the concentration of pH adjusting agent are 10g/L~50g/L；Wherein, catalyst is anionic surfactant；Stablize
Agent is the ionic compound containing filtering metal.
2. a kind of measurement test paper of chlorine residue according to claim 1, it is characterised in that: the color developing agent is selected from phenol derivative
At least one of object, anil.
3. a kind of measurement test paper of chlorine residue according to claim 1, it is characterised in that: the catalyst is selected from carbon atom number
At least one of >=8 straight-chain alkyl sulfate surfactant, benzene sulfonate surfactant.
4. a kind of measurement test paper of chlorine residue according to claim 1, it is characterised in that: the stabilizer is selected from alkali metal molybdenum
At least one of hydrochlorate, alkali tungstates.
5. a kind of measurement test paper of chlorine residue according to claim 1, it is characterised in that: the pH adjusting agent is solid acid.
6. a kind of measurement test paper of chlorine residue according to claim 1, it is characterised in that: the preparation step of the measurement test paper
1) in, solvent is selected from one of methanol, ethyl alcohol, propyl alcohol, isopropanol, acetone, water or a variety of.
7. a kind of measurement test paper of chlorine residue according to claim 1, it is characterised in that: the preparation step of the measurement test paper
2) in, the time of immersion is 5min~30min.
8. a kind of measurement test paper of chlorine residue according to claim 1, it is characterised in that: the preparation step of the measurement test paper
2) in, substrate is that can hold formula bottom plate.
9. a kind of rapid assay methods of chlorine residue, characterized by the following steps: will be described in any one of claim 1~8
Chlorine residual measurement test paper immerse sample to be tested in, taken out after 10 seconds~15 seconds, wait develop the color completely, test paper and standard colorimetric are sticked into
Row color compares, and measures the contents of residual chlorine in sample.
10. a kind of rapid assay methods of chlorine residue according to claim 9, it is characterised in that: the system of the standard color comparison card
Preparation Method is as follows:
1) with pure water, compound concentration is more than 0.1mg/L, 0.5mg/L, 1mg/L, 3mg/L, 5mg/L, 7mg/L, 10mg/L respectively
Chlorine standard solution；
2) chlorine residual measurement test paper is immersed in each chlorine residue standard solution, is taken out after 10 seconds~15 seconds, wait develop the color completely, in Pan Tongse
Corresponding reference colour is found out on card；
3) standard color comparison card is made according to the color value of each reference colour.
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| CN113791066A (en) * | 2021-09-16 | 2021-12-14 | 上海三爱思试剂有限公司 | Test paper for measuring chlorine dioxide content and preparation method thereof |
| CN114414560A (en) * | 2021-12-30 | 2022-04-29 | 广东环凯生物技术有限公司 | Test paper for measuring total chlorine, preparation method thereof and method for rapidly measuring total chlorine |
| CN114460070A (en) * | 2021-12-31 | 2022-05-10 | 桂林优利特医疗电子有限公司 | Preparation method and application of test paper for detecting residual chlorine and total chlorine in water |
| CN117538318A (en) * | 2024-01-10 | 2024-02-09 | 山东利尔康医疗科技股份有限公司 | Residual peracetic acid test card and preparation method thereof |
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