CN109358053A - Dry method measures the steady test paper of increasing of ammonia and its preparation and detection method in air - Google Patents
Dry method measures the steady test paper of increasing of ammonia and its preparation and detection method in air Download PDFInfo
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- 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
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- G01N2021/7759—Dipstick; Test strip
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Abstract
The steady test paper of increasing of ammonia and its preparation and detection method, belong to environmental monitoring technology and industrial hygiene field in a kind of dry method measurement air.Dry method measures the steady test paper of increasing of ammonia in air, is that load has bromocresol purple-bromthymol blue mixed indicator and cationic surfactant test paper in base paper；In mass ratio, bromocresol purple: bromthymol blue: cationic surfactant=(0.1-0.55): (0.025-0.2): (X-X ')；According to different surfactants, X-X ' value is different.Preparation method includes preparing soak by reagent proportion, impregnates base paper, dry plastic packaging.Its detection method are as follows: ammonia is reacted with the mix reagent of test paper in detection zone air, becomes bluish violet by yellow, according to the relationship of the discoloration strip length and ammonia density of test paper, obtains the concentration of ammonia in detection zone air.In emergency monitoring when the detection method can be used for measuring workshop, ammonia density or NH_3 leakage in Workplace air.
Description
Technical field
The invention belongs to environmental monitorings and industrial hygiene technical field, in particular to the increasing of ammonia surely tries in dry method measurement air
Paper and its preparation and detection method.
Background technique
Ammonia is a kind of colourless and has intense irritation smell, and specific gravity is less than air, volatile gas.Ammonia is a kind of alkali
Property substance, it has corrosion and stimulation to the skin histology contacted；Excessively sucking ammonia can cause respiratory system to human body
Disease.Ammonia pollution refers in human activity process, when generating and utilizing ammonia, the pollution to environment.Promptly and accurately to measure atmosphere
The variation of middle ammonia content, quickly and effectively monitoring technology is very necessary.
Currently, the most commonly used is Wet techniques, first progress gas sample acquisition for the method for measuring ammonia in air, and e.g., solution
Absorption process；Packed column detention method, filtrate detention method are both rear to be required to elute the ammonia being enriched on packed column and filtrate with solution
Get off, then carry out subsequent measurements, such as uses spectrophotometry, electrode method.Above-mentioned wet process detection technique sensitivity, accuracy can reach
To good effect, but scene is needed to sample for a long time, analytical cycle is long or reagent toxicity is big, or operates cumbersome, Bu Nengji
The monitoring requirements of the large quantities of measuring points of situation and scene of Shi Fanying air pollution.
The real-time live monitoring Main Trends of The Development of air quality is dry technique, such as current technology maturation it is continuous automatic
Monitoring technology, have been used for monitoring air in sulfur dioxide, nitrogen oxides, carbon monoxide, ozone, pellet (PM10,
PM2.5) etc..
To realize the ammonia in fast-field evaluation air, method primarily now is gas detector method, and gas detector method is will to refer to
Show that agent loads on the inert carrier of certain particle size, is reloaded into elongated glass tube.In use, making air with certain speed
By glass tube, a kind of method of ammonia concentration is measured according to the shade of indicator discoloration in pipe or discoloration strip length,
The method category dry method detection technique, it is easy to operate, have become necessary configuration in emergency monitoring.But it is in the production process
There are filler dense uniform degree is different, and evaluated error is caused, and manufacturing process trouble.
Summary of the invention
It is an object of the present invention to provide the steady test paper of increasing of ammonia in a kind of dry method measurement air and its preparation and detection methods, this is dry
The steady test paper of increasing that method measures ammonia in air is a kind of cationic surfactant-mixed indicator test paper, is a kind of applied to sky
The drying measure test paper of ammonia in gas.The test paper is for when measuring, air to be diffused into from one end of the test paper of plastic packaging, in air
Ammonia is diffused on test paper and reacts, and becomes bluish violet by yellow, according to the quantitative relationship of the length of color and ammonia density, determines empty
Ammonia content in gas.The measuring method can be used for measuring emergency when workshop, ammonia density or NH_3 leakage in Workplace air
In monitoring.
The steady test paper of increasing of ammonia, is that load has bromocresol purple-bromthymol blue in base paper in dry method measurement air of the invention
The test paper of mixed indicator and cationic surfactant；In mass ratio, bromocresol purple: bromthymol blue: cationic surface is living
Property agent=(0.1-0.55): (0.025-0.2): (X-X ')；
The cation surface activating is long chain alkyl dimethyl benzyl ammonium chloride, chain alkyl pyridinium bromide, long-chain
One or more of alkyl pyridinium chloride or the leptodactyline of chain alkyl；
Different, the value of X and X ' according to the type of cationic surfactant are as follows:
When cationic surfactant is long chain alkyl dimethyl benzyl ammonium chloride, X=0.001, X '=0.004；
When cationic surfactant is chain alkyl pyridinium bromide, X=0.003, X '=0.01；
When cationic surfactant is chain alkyl pyridinium chloride, X=0.004, X '=0.012；
When cationic surfactant is the leptodactyline of chain alkyl, X=0.004, X '=0.006.
The long chain alkyl dimethyl benzyl ammonium chloride, the preferably zephiran of C12-C18, more
Preferably tetradecyl chloride base dimethylbenzyl ammonium (Zeph)；
The chain alkyl pyridinium bromide, the preferably cetylpyridinium bromide of C12-C16, more preferably hexadecane bromide
Change pyridine (CPB)；
The chain alkyl pyridinium chloride, the alkyl pyridinium chloride of preferably C12-C16.
The leptodactyline of the chain alkyl, the preferably alkyl trimethyl ammonium bromide of C12-C18, more preferably ten
Six alkyl trimethyl ammonium bromides (CTMAB).
The base paper is one of chromatography filter paper item or quantitative filter paper article.
The steady test paper of increasing of ammonia in the dry method measurement air, specification is a length of 60~100mm, and width is 3~5mm.
The steady test paper of increasing of ammonia in the dry method measurement air, the concentration range of measurement ammonia is 3.0~35mg/m3, inspection
Rising limit is 2.0mg/m3。
The preparation method of the steady test paper of increasing of ammonia in dry method measurement air of the invention, comprising the following steps:
Step 1: preparing soak
Bromocresol purple is dissolved in ethyl alcohol, bromocresol purple ethanol solution is obtained；
Bromthymol blue is dissolved in ethyl alcohol, bromthymol blue ethanol solution is obtained；
After mixing by bromocresol purple ethanol solution and bromthymol blue ethanol solution, cation surface activating is added
Agent aqueous solution with ethyl alcohol constant volume, and is uniformly mixed, obtains soak；
Wherein, in every liter of soak, the content of the ingredient and each ingredient that contain are as follows: bromocresol purple 0.1-0.55g, bromine
Thymol blue is 0.025-0.2g, and cationic surfactant X-X ' g, surplus is the mixed liquor of second alcohol and water, and ethyl alcohol accounts for second
Total volume ratio >=90% of the mixed liquor of alcohol and water；
Step 2: impregnating
Base paper is placed in soak and is impregnated, the test strips after being impregnated；Wherein, soaking time is that base paper absorbs immersion
Until liquid reaches saturation；
Step 3: dry plastic packaging
After the test paper drying after immersion, in 120~150 DEG C of progress plastic packagings, the increasing for obtaining ammonia in dry method measurement air is steady
Test paper.
In the step 1, bromocresol purple, bromthymol blue can also be dissolved in ethyl alcohol, obtain bromocresol purple-bromine hundred
In phenol indigo plant ethanol solution；Aqueous solution of cationic surfactant active is added, with ethyl alcohol constant volume, and is uniformly mixed, obtains soak.
In the step 1, the cationic surfactant is long chain alkyl dimethyl benzyl ammonium chloride, long alkane
One or more of base pyridinium bromide, chain alkyl pyridinium chloride or leptodactyline of chain alkyl.
In the step 1, the mass-volume concentration of the aqueous solution of cationic surfactant active is 0.5-5g/L.
In the step 1, the ethyl alcohol is the ethyl alcohol of percent by volume >=90%, preferably dehydrated alcohol or volume
The ethyl alcohol that percentage is 95%.
In the step 2, the soaking time is 10~30min.
In the step 2, the soaking temperature is 60~80 DEG C.
In the step 3, the drying is dried or is dried for room temperature.
In the step 3, the drying, specifically: the test paper after immersion is placed in constant temperature oven, 60~
100 DEG C of 5~30min of drying.
In the step 3, the plastic packaging carries out plastic packaging press mold using plastic packaging machine.
The steady test paper of increasing of ammonia in the described dry method measurement air, specification can be cut before plastic packaging after the drying,
It can be cut before immersion.
In the present invention, the water removes specified otherwise, refers both to no ammonium hydroxide.
The detection method of the steady test paper of increasing of ammonia in dry method measurement air of the invention, comprising the following steps:
(1) one end that dry method is measured to the steady test paper of increasing of ammonia in air is cut off, and detection zone, detection zone air are placed on
The reagent loaded on middle ammonia and the steady test paper of increasing of ammonia in dry method measurement air reacts, and test paper becomes bluish violet, reaction 15 by yellow
After~30min, the length that bluish violet changes along test strips is read, for the strip length that changes colour；
(2) is measured by discoloration strip length, detection zone can be obtained for the relationship of ammonia density according to the discoloration strip length of test paper
The concentration of ammonia in the air of domain.
The discoloration strip length of the test paper is to the relationship of ammonia density using one of following four expression way:
The first, according to the standard series concentration experiment of ammonia, obtain discoloration strip length and ammonia concentration in air it is linear
Regression equation；Discoloration strip length, which is acquired, by regression equation corresponds to ammonia density.
Second, according to the standard series concentration experiment of ammonia, obtained discoloration strip length is corresponding with ammonia concentration in air
Relationship, production discoloration strip length-ammonia density table acquire ammonia concentration in air according to discoloration strip length using interpolation method.
The third, according to the equation of linear regression of discoloration strip length and ammonia concentration in air, ammonia surveyors' staff obtained；Benefit
The ammonia density corresponding to tape measure discoloration strip length.
4th kind, according to the equation of linear regression of discoloration strip length and ammonia concentration in air, air directly is measured in dry method
Measuring scale is marked on the steady test paper of the increasing of middle ammonia；Ammonia concentration in air is directly read according to discoloration strip length.
The equation of linear regression or discoloration strip length-ammonia density table of the discoloration strip length and ammonia concentration in air, root
Lower experiment obtains accordingly:
(1) steady test paper one end of increasing of ammonia in n dry method measurement air is cut off, is placed in the air of same known ammonia density
In bottle, reaction 15min-30min is taken out, meanwhile, it is marked in the discoloration band intersection of test paper, measures discoloration strip length with lattice ruler,
It should ensure that the zero graduation line of the opening dative ruler of test paper is overlapped record data when measurement, take the average value of n test paper parallel laboratory test
Foundation as discoloration strip length；Wherein, n >=3；
(2) step (1) is repeated, the content of the ammonia known to detection difference in the air bottle of ammonia density obtains discoloration belt length
Degree with ammonia concentration in air relation with contents table, i.e., discoloration strip length-ammonia density table, and acquire discoloration strip length and ammonia in air it is dense
The equation of linear regression of degree.
The steady test paper of increasing of ammonia and its preparation and detection method in dry method measurement air of the invention, it has the advantage that:
1, in dry method measurement air of the invention ammonia the steady test paper of increasing, make the mensuration mode of ammonia become it is simpler, intuitive and
Effectively.Since the discoloration for having used mixed indicator to react ammonia is sharper, the sensitivity of reaction is improved；Cation is added
Steady test paper of the test paper than being added without cationic surfactant of increasing of ammonia, sensitivity in the dry method measurement air of surfactant
Improve 5-10%.The steady test paper precision of increasing of ammonia is more preferable in the dry method measurement air of production, for 25mg/m3Ammonia density, 5 surveys
The fixed coefficient of variation is respectively less than 1%.Illustrate that the precision of test paper measurement ammonia of the present invention is fine.
2, dry method measures the steady test paper of increasing of ammonia in air, and the concentration range of measurement ammonia is 3.0~35mg/m3, detection limit
For 2.0mg/m3。
3, to provide a kind of manufacture craft simple for the steady test paper of increasing of ammonia in dry method measurement air of the invention, sensitivity compared with
Height, the good dry method of precision measure the new technology of ammonia in air.Realize the measurement to simple on-site.
4, dry method of the invention measures the steady test paper of increasing of ammonia in air, is with chromatography filter paper or quantitative filter paper load bromine cresols
Purple-bromthymol blue mixed indicator and cationic surfactant, and drying plastic packaging is made.In bromocresol purple-bromine hundred
Phenol indigo plant ethyl alcohol mixed indicator, which has, reduces pH color change interval, the sharp feature of reaction discoloration.Cationic surfactant is in water
Positively charged surface-active ion is formed in solution, is generally used for industrial circulating water non oxidizing bactericide, and aquatic products is supported
It grows and uses disinfectant, softening agent for fibres, antistatic agent has different degrees of solubilising to the variable color system of organic dyestuff, and enhanced sensitivity increases
Surely, speedup increases all multiactions such as contrast, so also there is application in spectrophotometric method.In test paper middle-jiao yang, function of the spleen and stomach of the present invention
The effects of ionic surface active agent plays enhanced sensitivity, increases surely, increases contrast.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the steady test paper of increasing that a kind of dry method of the invention measures ammonia in air.
Specific embodiment
Below with reference to embodiment, the present invention is described in further detail.
Embodiment 1
A kind of dry method measures the steady test paper of increasing of ammonia in air, is that load has bromocresol purple-bromthymol blue in chromatography filter paper
The test paper of mixed indicator and tetradecyl chloride base dimethylbenzyl ammonium (Zeph)；In mass ratio, bromocresol purple: bromthymol blue:
Tetradecyl chloride base dimethylbenzyl ammonium (Zeph)=0.2:0.05:0.002.
A kind of dry method measures the preparation method for increasing steady test paper of ammonia in air, comprising the following steps:
Step 1: preparing soak
Bromocresol purple is dissolved in ethyl alcohol, bromocresol purple ethanol solution is obtained；
Bromthymol blue is dissolved in ethyl alcohol, bromthymol blue ethanol solution is obtained；
After mixing by bromocresol purple ethanol solution and bromthymol blue ethanol solution, tetradecyl chloride base two is added
Dimethyl benzyl ammonium (Zeph) aqueous solution with ethyl alcohol constant volume, and is uniformly mixed, obtains soak；
Wherein, in every liter of soak, the content of the ingredient and each ingredient that contain are as follows: bromocresol purple 0.2g, in bromine hundred
Phenol indigo plant is 0.05g, and tetradecyl chloride base dimethylbenzyl ammonium (Zeph) is 0.002g, and surplus is the mixed liquor of second alcohol and water, ethyl alcohol
The total volume ratio for accounting for the mixed liquor of second alcohol and water is 90%；
Step 2: impregnating
Chromatography filter paper is placed in soak and is impregnated, the test strips after being impregnated；Wherein, soaking time 20min, leaching
Steeping temperature is 70 DEG C.
Step 3: dry plastic packaging
Test paper after immersion is placed in constant temperature oven, after 80 DEG C of drying 20min are dry, is cut to a length of 80mm, it is wide
The steady test paper of increasing of ammonia in dry method measurement air is obtained using plastic packaging machine in 130 DEG C of progress plastic packagings for 4mm.
A kind of dry method measures the detection method for increasing steady test paper of ammonia in air, comprising the following steps:
(1) one end that dry method is measured to the steady test paper of increasing of ammonia in air is cut off, and detection zone, detection zone air are placed on
The reagent loaded on middle ammonia and the steady test paper of increasing of ammonia in dry method measurement air reacts, and test paper becomes bluish violet by yellow, after reaction,
The length that bluish violet changes along test strips is read, for the strip length that changes colour；
(2) according to the discoloration strip length of test paper to the relationship of ammonia density, wherein according to experiment, obtained discoloration strip length
With the equation of linear regression of ammonia concentration in air；Measuring scale directly is marked on the steady test paper of increasing of ammonia in dry method measurement air, is done
The structural schematic diagram of the steady test paper of increasing of ammonia is shown in Fig. 1 in method measurement air, directly reads ammonia concentration in air according to discoloration strip length.
The equation of linear regression of the discoloration strip length and ammonia concentration in air, obtains according to following experiment:
(1) steady test paper one end of increasing of ammonia in 5 dry method measurement air is cut off, is placed in the air of same known ammonia density
In bottle, reaction 20min is taken out, meanwhile, it is marked in the discoloration band intersection of test paper, discoloration strip length is measured with lattice ruler, when measurement
It should ensure that the zero graduation line of the opening dative ruler of test paper is overlapped record data, take the average value of 5 test paper parallel laboratory tests as change
The foundation discoloration strip length of colour band length；
(2) step (1) is repeated, the content of the ammonia known to detection difference in the air bottle of ammonia density obtains discoloration belt length
The equation of linear regression of degree and ammonia concentration in air content:
The equation of linear regression are as follows: Y=0.605x+0.05, in formula, x is ammonia density, unit mg/m3；Y is discoloration
The discoloration strip length of test paper, unit mm；Related coefficient is 0.991；
The ammonia density range of linearity that dry method measures the measurement of the steady test paper of increasing of ammonia in air is 3.0~35mg/m3.For dense
Spend 25mg/m3Ammonia measures 5 times, RSD 0.52%.
Embodiment 2
A kind of dry method measures the steady test paper of increasing of ammonia in air, is that load has bromocresol purple-bromthymol blue in chromatography filter paper
The test paper of mixed indicator and brocide (CPB)；In mass ratio, bromocresol purple: bromthymol blue: bromination 16
Alkyl pyridine (CPB)=0.55:0.15:0.01.
A kind of dry method measures the preparation method for increasing steady test paper of ammonia in air, comprising the following steps:
Step 1: preparing soak
Bromocresol purple is dissolved in ethyl alcohol, bromocresol purple ethanol solution is obtained；
Bromthymol blue is dissolved in ethyl alcohol, bromthymol blue ethanol solution is obtained；
After mixing by bromocresol purple ethanol solution and bromthymol blue ethanol solution, adding concentration is 0.1/L's
Brocide (CPB) aqueous solution with ethyl alcohol constant volume, and is uniformly mixed, obtains soak；
Wherein, in every liter of soak, the content of the ingredient and each ingredient that contain are as follows: bromocresol purple 0.55g, in bromine hundred
Phenol indigo plant be 0.15g, brocide (CPB) be 0.01g, surplus be second alcohol and water mixed liquor, ethyl alcohol account for ethyl alcohol and
The total volume ratio of the mixed liquor of water is 95%；
Step 2: impregnating
Chromatography filter paper is placed in soak and is impregnated, the test strips after being impregnated；Wherein, soaking time 10min, leaching
Steeping temperature is 80 DEG C.
Step 3: dry plastic packaging
Test paper after immersion is placed in constant temperature oven, after 90 DEG C of drying 15min are dry, is cut to a length of 60mm, it is wide
The steady test paper of increasing of ammonia in dry method measurement air is obtained using plastic packaging machine in 140 DEG C of progress plastic packagings for 3mm.
A kind of dry method measures the detection method for increasing steady test paper of ammonia in air, comprising the following steps:
(1) one end that dry method is measured to the steady test paper of increasing of ammonia in air is cut off, and detection zone, detection zone air are placed on
The reagent loaded on middle ammonia and the steady test paper of increasing of ammonia in dry method measurement air reacts, and test paper becomes bluish violet by yellow, after reaction,
The length that bluish violet changes along test strips is read, for the strip length that changes colour；
(2) according to the discoloration strip length of test paper to the relationship of ammonia density, wherein according to experiment, obtained discoloration strip length
With the equation of linear regression of ammonia concentration in air；Discoloration strip length, which is acquired, by regression equation corresponds to ammonia density.
The equation of linear regression of the discoloration strip length and ammonia concentration in air, obtains according to following experiment:
(1) steady test paper one end of increasing of ammonia in 5 dry method measurement air is cut off, is placed in the air of same known ammonia density
In bottle, reaction 20min is taken out, meanwhile, it is marked in the discoloration band intersection of test paper, discoloration strip length is measured with lattice ruler, when measurement
It should ensure that the zero graduation line of the opening dative ruler of test paper is overlapped record data, take the average value of 5 test paper parallel laboratory tests as change
Colour band length；
(2) step (1) is repeated, the content of the ammonia known to detection difference in the air bottle of ammonia density obtains discoloration belt length
The equation of linear regression of degree and ammonia concentration in air content:
The equation of linear regression are as follows:
Y=0.618x-0.06, in formula, x is ammonia density, unit mg/m3；Y is the discoloration strip length of discoloration test paper, unit
For mm；Related coefficient is 0.988；
The ammonia density range of linearity that the present embodiment dry method measures the measurement of the steady test paper of increasing of ammonia in air is 3.0~35mg/
m3.For concentration 25mg/m3Ammonia measures 5 times, RSD 0.59%.
Embodiment 3
A kind of dry method measures the steady test paper of increasing of ammonia in air, with embodiment 1, the difference is that, cation surface activating
Agent is the leptodactyline of chain alkyl, long-chain C12-C18Alkyl trimethyl ammonium bromide, the present embodiment is CTMAB, every
Rise content 0.004-0.006g.
The preparation method of the steady test paper of increasing of ammonia in a kind of dry method measurement air, with embodiment 1, the difference is that, sun from
Sub- surfactant is CTMAB.
A kind of dry method measures the detection method for increasing steady test paper of ammonia in air: with embodiment 1, the difference is that, according to
Equation of linear regression makes ammonia surveyors' staff,.The equation of linear regression of obtained discoloration strip length and ammonia concentration in air are as follows: Y
=0.592x+0.11, in formula, x is ammonia density, unit mg/m3；Y is the discoloration strip length of discoloration test paper, unit mm；It is related
Coefficient is 0.998；In the dry method measurement air of the present embodiment the ammonia density range of linearity of the increasing steady test paper measurement of ammonia be 3.0~
35mg/m3.For concentration 25mg/m3Ammonia measures 5 times, RSD 0.61%.
In the detection process, test paper is to 2.0mg/m3Ammonia have bluish violet appearance, but change colour strip length should not accurately survey
It is fixed, it is possible to which that the minimum detectability for determining test paper is 2.0mg/m3。
Claims (10)
1. the steady test paper of increasing of ammonia in a kind of dry method measurement air, which is characterized in that the dry method measures the steady test paper of increasing of ammonia in air
It is that load has bromocresol purple-bromthymol blue mixed indicator and cationic surfactant test paper in base paper；In mass ratio,
Bromocresol purple: bromthymol blue: cationic surfactant=(0.1-0.55): (0.025-0.2): (X-X ')；
The cation surface activating is long chain alkyl dimethyl benzyl ammonium chloride, chain alkyl pyridinium bromide, chain alkyl
One or more of pyridinium chloride or the leptodactyline of chain alkyl；
Different, the value of X and X ' according to the type of cationic surfactant are as follows:
When cationic surfactant is long chain alkyl dimethyl benzyl ammonium chloride, X=0.001, X '=0.004；
When cationic surfactant is chain alkyl pyridinium bromide, X=0.003, X '=0.01；
When cationic surfactant is chain alkyl pyridinium chloride, X=0.004, X '=0.012；
When cationic surfactant is the leptodactyline of chain alkyl, X=0.004, X '=0.006.
2. the steady test paper of increasing of ammonia in dry method measurement air as described in claim 1, which is characterized in that the chain alkyl two
Methylbenzyl ammonium chloride is the zephiran of C12-C18；
The chain alkyl pyridinium bromide is the cetylpyridinium bromide of C12-C16；
The chain alkyl pyridinium chloride is the alkyl pyridinium chloride of C12-C16；
The leptodactyline of the chain alkyl is the alkyl trimethyl ammonium bromide of C12-C18.
3. the steady test paper of increasing of ammonia in dry method measurement air as described in claim 1, which is characterized in that the base paper is chromatography
One of filter paper item or quantitative filter paper article；
The steady test paper of increasing of ammonia in the dry method measurement air, specification is a length of 60~100mm, and width is 3~5mm.
4. the steady test paper of increasing of ammonia in dry method measurement air as described in claim 1, which is characterized in that the dry method measures empty
The steady test paper of the increasing of ammonia in gas, the concentration range of measurement ammonia are 3.0~35mg/m3, detect and be limited to 2.0mg/m3。
5. dry method described in claim 1-4 any one measures the preparation method of the steady test paper of increasing of ammonia in air, feature exists
In, comprising the following steps:
Step 1: preparing soak
Bromocresol purple is dissolved in ethyl alcohol, bromocresol purple ethanol solution is obtained；
Bromthymol blue is dissolved in ethyl alcohol, bromthymol blue ethanol solution is obtained；
After mixing by bromocresol purple ethanol solution and bromthymol blue ethanol solution, cationic surfactant water is added
Solution with ethyl alcohol constant volume, and is uniformly mixed, obtains soak；
Wherein, in every liter of soak, the content of the ingredient and each ingredient that contain are as follows: bromocresol purple 0.1-0.55g, in bromine hundred
Phenol indigo plant be 0.025-0.2g, cationic surfactant X-X ' g, surplus be second alcohol and water mixed liquor, ethyl alcohol account for ethyl alcohol and
Total volume ratio >=90% of the mixed liquor of water；
Step 2: impregnating
Base paper is placed in soak and is impregnated, the test strips after being impregnated；Wherein, soaking time is that base paper absorption soak reaches
Until saturation；
Step 3: dry plastic packaging
After the test paper drying after immersion, in 120~150 DEG C of progress plastic packagings, the steady test paper of increasing of ammonia in dry method measurement air is obtained.
6. the preparation method of the steady test paper of increasing of ammonia in dry method measurement air as claimed in claim 5, which is characterized in that described
In step 1, by bromocresol purple, bromthymol blue is dissolved in ethyl alcohol, obtains bromocresol purple-bromthymol blue ethanol solution；Again plus
Enter aqueous solution of cationic surfactant active, with ethyl alcohol constant volume, and is uniformly mixed, obtains soak.
7. the preparation method of the steady test paper of increasing of ammonia in dry method measurement air as claimed in claim 5, which is characterized in that described
In step 2, soaking time is 10~30min, and soaking temperature is 60~80 DEG C.
8. the preparation method of the steady test paper of increasing of ammonia in dry method measurement air as claimed in claim 5, which is characterized in that described
In step 3, the drying is dried or is dried for room temperature；
The drying, specifically: the test paper after immersion is placed in constant temperature oven, in 60~100 DEG C of 5~30min of drying；
The plastic packaging carries out plastic packaging press mold using plastic packaging machine；
The steady test paper of increasing of ammonia, specification are cut before plastic packaging after the drying in the dry method measurement air, or before immersion
It cuts.
9. dry method described in claim 1-4 any one measures the detection method of the steady test paper of increasing of ammonia in air, feature exists
In, comprising the following steps:
(1) one end that dry method is measured to the steady test paper of increasing of ammonia in air is cut off, and detection zone, ammonia in detection zone air are placed on
React with the reagent loaded on the steady test paper of increasing of ammonia in dry method measurement air, test paper becomes bluish violet by yellow, react 15~
After 30min, the length that bluish violet changes along test strips is read, for the strip length that changes colour；
(2) discoloration strip length is measured to the relationship of ammonia density according to the discoloration strip length of test paper, detection zone sky can be obtained
The concentration of ammonia in gas；
The discoloration strip length of the test paper is to the relationship of ammonia density using one of following four expression way:
The first, is according to the standard series concentration experiment of ammonia, the linear regression of obtained discoloration strip length and ammonia concentration in air
Equation；Discoloration strip length, which is acquired, by regression equation corresponds to ammonia density；
Second, according to the standard series concentration experiment of ammonia, the corresponding relationship of obtained discoloration strip length and ammonia concentration in air,
Production discoloration strip length-ammonia density table acquires ammonia concentration in air according to discoloration strip length using interpolation method；
The third, according to the equation of linear regression of discoloration strip length and ammonia concentration in air, ammonia surveyors' staff obtained；Utilize mark
Ammonia density corresponding to ruler measurement discoloration strip length；
4th kind, according to the equation of linear regression of discoloration strip length and ammonia concentration in air, the ammonia directly in dry method measurement air
The steady test paper of increasing on mark measuring scale；Ammonia concentration in air is directly read according to discoloration strip length.
10. the detection method of the steady test paper of increasing of ammonia in dry method measurement air as claimed in claim 9, which is characterized in that described
Discoloration strip length and ammonia concentration in air equation of linear regression or discoloration strip length-ammonia density table, tested according to following
It arrives:
(1) steady test paper one end of increasing of ammonia in n dry method measurement air is cut off, is placed in the air bottle of same known ammonia density,
15min-30min is reacted to take out, meanwhile, it is marked in the discoloration band intersection of test paper, discoloration strip length is measured with lattice ruler, when measurement
It should ensure that the zero graduation line of the opening dative ruler of test paper is overlapped record data, take the average value of n test paper parallel laboratory test as change
The foundation of colour band length；Wherein, n >=3；
(2) repeat step (1), detection difference known to ammonia density air bottle in ammonia content, obtain discoloration strip length with
Ammonia concentration in air relation with contents table, i.e. discoloration strip length-ammonia density table, and acquire discoloration strip length and ammonia concentration in air
Equation of linear regression.
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| CN108776132A (en) * | 2018-04-18 | 2018-11-09 | 沈阳理工大学 | The simple test paper of ammonia and its preparation and assay method in a kind of measurement air |
| CN108802022A (en) * | 2018-04-18 | 2018-11-13 | 沈阳理工大学 | The simple measuring test paper of ammonia and its preparation and assay method in a kind of air |
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| CN108776132A (en) * | 2018-04-18 | 2018-11-09 | 沈阳理工大学 | The simple test paper of ammonia and its preparation and assay method in a kind of measurement air |
| CN108802022A (en) * | 2018-04-18 | 2018-11-13 | 沈阳理工大学 | The simple measuring test paper of ammonia and its preparation and assay method in a kind of air |
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| CN116893170A (en) * | 2023-09-11 | 2023-10-17 | 泉州翔龙石化有限公司 | Method and device for rapidly detecting cation degree in polyacrylamide |
| CN116893170B (en) * | 2023-09-11 | 2023-11-24 | 泉州翔龙石化有限公司 | Method and device for rapidly detecting cation degree in polyacrylamide |
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