CN105548053B - NCl in a kind of air3Detection device - Google Patents
NCl in a kind of air3Detection device Download PDFInfo
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- CN105548053B CN105548053B CN201610084787.3A CN201610084787A CN105548053B CN 105548053 B CN105548053 B CN 105548053B CN 201610084787 A CN201610084787 A CN 201610084787A CN 105548053 B CN105548053 B CN 105548053B
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- absorption bottle
- ncl
- room air
- air
- absorbance value
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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
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
Abstract
The invention discloses NCl in a kind of air3Detection device, described device includes vacuum pump, surge flask, spinner flowmeter, absorption bottle and portable spectrophotometer, and the absorption bottle absorbs room air to be detected using the absorption bottle using the pure water solution of excess KI as absorbing liquid；The absorption bottle is further made of 2 dnockout core gas samplers, is set to absorption bottle A and absorption bottle B, and the absorption bottle A is connected with absorption bottle B sequences；The portable spectrophotometer is used for after the absorption bottle absorbs room air, measures the absorbance value of the absorption bottle A and absorption bottle B respectively；The vacuum pump and spinner flowmeter are set to the end of the detection device, for manufacturing negative pressure in detection process so that room air to be detected can enter the absorption bottle.Above-mentioned apparatus can be to the NCl in room air3Site Detection is carried out, to grasp NCl in room air3Concentration value.
Description
Technical field
The present invention relates to NCl in air detection equipment technical field more particularly to a kind of air3Detection device.
Background technology
NCl3It is to be reacted institute with nitrogen compounds such as urea behind indoor public arena, such as indoor swimming pool chlorination
A kind of chlorine disinfection by-product generated, compared to its similar chlorine disinfection by-product --- NH2Cl、NHCl2For, NCl3Thorn
Sharp property is stronger, and volatility is stronger, and volatility is 286~966 times of rear the two；In addition in the indoor pool water of chlorination,
NCl3The shared ratio highest in chloramines class product, up to 70% or so, swimmer is easier to lead to during swimming exercise
Rapid breathing sucking respiratory tract and lung are crossed, to be damaged to body, or even suffers from obtaining asthma.
It is directed to NCl in the indoor swimming pool air of chlorination in the prior art3Totally two kinds of detection method, respectively be experiment
Room detection method and Site Detection method.Wherein, the principle of laboratory test is will to remove NCl first with polytetrafluoroethylene filter3
In addition include gaseous state chlorine, droplet (hydrosol), NH containing HClO2Cl、NHCl2Equal chlorine-bearing compounds removal, then utilizes
(the Na being impregnated with2CO3+As2O3) quartz fibre filter is by NCl3In Cl+It is reduced to Cl-, finally utilize ion chromatography analysis
Cl-, and then extrapolate NCl3Amount；The principle of Site Detection method is to extract indoor pool air (containing NCl with vacuum pump3) logical
Absorbing liquid is crossed, absorbing liquid is the KI and N of 15ml, N- diethyl p-phenylenediamine's solution, NCl3It can make under the catalytic action of KI
The aobvious pink of N, N- diethyl p-phenylenediamine, the shade and NCl in indoor swimming pool air3Mass concentration be positively correlated
Relationship, and then the smart mating small-sized spectrophotometer of blue swimming pool can be defended by Palintest (detection selects free chlorine 5mg/L)
It measures chlorine number of dissociating and is inferred to NCl in air3Mass concentration.
Above-mentioned NCl existing in the prior art3There is more problem in laboratory test and Site Detection method, such as test
Room detection method is complicated, and complex steps need high-end precision instrument；And the DPD1 analoids that Site Detection method is utilized are (main
Ingredient is N, N- diethyl p-phenylenediamines) belong to pure imported product, price costly, is unfavorable for the big rule of in-situ check and test method
Mould promotes and applies, while detecting NCl3DPD detection method graticules used in concentration are very difficult to draw, main reason is that DPD is molten
Liquid is unstable, is easy to aoxidize in air.
Invention content
The object of the present invention is to provide NCl in a kind of air3Detection device, which can be in room air
NCl3Site Detection is carried out, to grasp NCl in room air3Concentration value, such as find NCl3Concentration value is exceeded, then can take
Measure improves room air situation, ensures that personnel's is safe and healthy.
NCl in a kind of air3Detection device, described device includes vacuum pump, surge flask, spinner flowmeter, absorption bottle
And portable spectrophotometer, wherein：
The absorption bottle absorbs interior to be detected using the absorption bottle using the pure water solution of excess KI as absorbing liquid
Air；
The absorption bottle is further made of 2 dnockout core gas samplers, is set to absorption bottle A and absorption bottle B, and
The absorption bottle A is connected with absorption bottle B sequences；
The portable spectrophotometer is used for after the absorption bottle absorbs room air, measures the absorption bottle respectively
The absorbance value of A and absorption bottle B；
Wherein, if the absorbance value of the absorption bottle A and absorption bottle B is respectively A and B, and the difference that C is the two, i.e. C=B-
A is waited for then after acquiring C further according to described in the linearly related equation acquisition between the free chlorine number measured in advance and absorbance value
Detect NCl in room air3Mass concentration；
The vacuum pump and spinner flowmeter are set to the end of the detection device, negative for being manufactured in detection process
Pressure so that room air to be detected can enter the absorption bottle.
The absorbing liquid is specifically dissolved in 15ml pure water by 1gKI and is formed.
When the absorption bottle is using the pure water solution of excess KI as when absorbing liquid, NCl3Strong oxidizing property by the oxygen in KI
Turn to I2, and I2With I-Complexing forms I3 -, displaing yellow, NCl in shade and room air3Mass concentration it is directly proportional,
The reaction equation being directed to includes：
2NCl3+6OH-—N2+3OCl-+3Cl-+3H2O
OCl-+2I-+H2O—Cl-+I2+2OH-
I2+I-—I3 -
And the portable spectrophotometer carries out the detection of absorbance value under 350nm wavelength.
The absorption bottle is using the pure water solution of the pure water solution of starch-KI replacement excess KI as absorbing liquid, at this time
NCl3Strong oxidizing property by the I in KI-It is oxidized to I2, I2Aobvious blue, shade and NCl in room air is complexed with starch3
Mass concentration it is directly proportional, the reaction equation being directed to includes：
2NCl3+6OH-—N2+3OCl-+3Cl-+3H2O
OCl-+2I-+H2O—Cl-+I2+2OH-
And the portable spectrophotometer carries out the detection of absorbance value under 570nm wavelength.
Linearly related equation between the free chlorine number measured in advance and absorbance value is specially：
Y=0.4092x-0.0039
In formula, x is the free chlorine number c of DPD-KI in-situ check and test methods；
Y is the absorbance value c of excess KI method absorbing liquids1。
The flow control of the spinner flowmeter is 1L/min.
The technical solution provided by aforementioned present invention is it is found that above-mentioned apparatus can be to the NCl in room air3Carry out scene
Detection, to grasp NCl in room air3Concentration value.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 provides NCl in air by the embodiment of the present invention3Structure of the detecting device schematic diagram；
Fig. 2 provides DPD-KI in-situ check and test methods free chlorine residual C values and excess KI Site Detections by the embodiment of the present invention
Absorbance value C of the method under 350nm wavelength1Between linear dependence curve synoptic diagram.
Specific implementation mode
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on this
The embodiment of invention, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, belongs to protection scope of the present invention.
The embodiment of the present invention is described in further detail below in conjunction with attached drawing, is implemented as shown in Figure 1 for the present invention
NCl in the provided air of example3Structure of the detecting device schematic diagram, described device mainly include vacuum pump 1, surge flask 2, rotor stream
Gauge 3, absorption bottle 4, at the same further include have portable spectrophotometer, wherein：
The absorption bottle 4 is absorbed to be detected using the pure water solution of excessive (1g) KI as absorbing liquid using the absorption bottle 4
Room air；
The absorption bottle 4 is further made of 2 dnockout core gas samplers, is set to absorption bottle A and absorption bottle B,
And the absorption bottle A is connected with absorption bottle B sequences；Here, the purpose of setting absorption bottle A is to verify NCl3It is whether complete
It is complete that absorption bottle B is made to be saturated and cross, to which NCl should be not present in absorption bottle A3。
The portable spectrophotometer is used for after the absorption bottle absorbs room air (such as 100L), is measured respectively
The absorbance value of the absorption bottle A and absorption bottle B；
Wherein, if the absorbance value of the absorption bottle A and absorption bottle B is respectively A and B, and the difference that C is the two, i.e. C=B-
A, then after acquiring C, between the free chlorine number further according to the DPD-KI methods measured in advance and the absorbance value of excess KI methods
Linearly related equation obtain NCl in the room air to be detected3Mass concentration；
Linearly related equation between the above-mentioned free chlorine number measured in advance and absorbance value is specially：
Y=0.4092x-0.0039
The free chlorine number c (mg/L) of x-DPD-KI in-situ check and test methods in formula；
The absorbance value c of y-excess KI method absorbing liquids1；
In this example, specifically using DPD-KI Site Detections method and excess KI Site Detections method multiple indoor spaces into
Row actual measurement post analysis obtains the linearly related equation between the free chlorine number of DPD-KI methods and the absorbance value of excess KI methods,
Specifically：
By the way that DPD-KI in-situ check and test methods device is in parallel with excess KI in-situ check and test method devices, and air entry is placed in
At the swimming pool edge above 30cm of the water surface, opens vacuum pump and allows two covering devices to be evacuated simultaneously, extract 50L, 100L respectively,
150L, 200L, 250L and 300L natatorium air measure the free chlorine number of DPD-KI in-situ check and test method absorbing liquids respectively
With absorbance value of the excessive KI in-situ check and test methods absorbing liquid under 350nm wavelength, at least carried out 3 times wherein being each evacuated volume
The correlativity of experiment, the free chlorine number of analysis DPD-KI detection methods and excess KI detection method absorbance values simultaneously establishes linear correlation side
Journey, free linearly related equation between chlorine number and absorbance value are specially：
Y=0.4092x-0.0039
The free chlorine number c (mg/L) of x-DPD-KI in-situ check and test methods in formula；
The absorbance value c of y-excess KI method absorbing liquids1；
The vacuum pump 1 and spinner flowmeter 3 are set to the end of the detection device, for being manufactured in detection process
Negative pressure so that room air to be detected can enter the absorption bottle, in the specific implementation, the flow control of the spinner flowmeter
It is made as 1L/min.
In this example, which can be specifically dissolved in 15ml pure water by 1gKI solids and be formed, when the absorption bottle
Using the pure water solution of excessive KI as when absorbing liquid：
NCl3Strong oxidizing property (Cl therein+For+1 valence) it can be by the I in KI-It is oxidized to I2, and I2With I-The aobvious Huang of complexing
Color, shade and NCl in room air3Mass concentration it is directly proportional, the reaction equation being directed to includes：
2NCl3+6OH-—N2+3OCl-+3Cl-+3H2O
OCl-+2I-+H2O—Cl-+I2+2OH-
I2+I-—I3 -
And the portable spectrophotometer carries out the detection of absorbance value under 350nm wavelength, and after acquiring C, then
NCl in the room air to be detected is obtained according to the above-mentioned linearly related equation measured in advance3Mass concentration.
In addition, the absorption bottle can also substitute the pure water solution of excess KI as suction using the pure water solution of starch-KI
Liquid is received, utilizes NCl at this time3Oxidisability can be by the I in KI-It is oxidized to I2, I2The characteristic for showing blue, face are complexed with starch
Color depth it is shallow with room air in NCl3Mass concentration it is directly proportional, the reaction equation being directed to includes：
2NCl3+6OH-—N2+3OCl-+3Cl-+3H2O
OCl-+2I-+H2O—Cl-+I2+2OH-
And the portable spectrophotometer carries out the detection of absorbance value under 570nm wavelength, further according to being obtained ahead of time
DPD-KI situ methods measure free chlorine number and starch-KI absorbing liquids are linear between absorbance value under 570nm wavelength
NCl in the room air to be detected is calculated in dependent equation3Mass concentration.
The course of work of above-mentioned detection device is described in detail with specific example below, by Chaoyang District, Beijing City
Certain natatorium is detected for a long time, and experiment the results are shown in Table 1：
1 Chaoyang District natatorium DPD-KI methods of table and excess KI method test results
Note：Data value in table 1 is the average value of 3 detections.
DPD-KI in-situ check and test methods free chlorine residual C values can be obtained according to the data of table 1 and excess KI in-situ check and test methods exist
Absorbance value C under 350nm wavelength1Between linearly related linearity curve it is as shown in Figure 2.
In conclusion the device that the embodiment of the present invention is provided can be to the NCl in room air3Site Detection is carried out,
To grasp NCl in room air3Concentration value (World Health Organization is by NCl3Limit value be set as 500ug/m3), such as find
NCl3Concentration value is exceeded, then can take measures to improve room air situation, ensure that personnel's is safe and healthy.Such as indoor trip
NCl in swimming pool air3Concentration over-standard such as can be changed to O by improving method for treating water by NaClO disinfections3- NaClO combinations disappear
Poison changes the measures such as water, the ventilation quantity for increasing natatorium by NCl3Control is in safety limit hereinafter, to ensure swimmer, especially
It is the health of children and pool attendant.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Any one skilled in the art is in the technical scope of present disclosure, the change or replacement that can be readily occurred in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Subject to enclosing.
Claims (6)
1. NCl in a kind of air3Detection device, which is characterized in that described device includes vacuum pump, surge flask, spinner
Meter, absorption bottle and portable spectrophotometer, wherein：
The absorption bottle absorbs Interior Space to be detected using the absorption bottle using the pure water solution of excess KI as absorbing liquid
Gas；
The absorption bottle is further made of 2 dnockout core gas samplers, is set to absorption bottle A and absorption bottle B, and described
Absorption bottle A is connected with absorption bottle B sequences, wherein room air to be detected enters back into after entering absorption bottle B by air inlet
Absorption bottle A；
The portable spectrophotometer be used for the absorption bottle absorb room air after, measure respectively the absorption bottle A and
The absorbance value of absorption bottle B；
Wherein, if the absorbance value of the absorption bottle A and absorption bottle B is respectively A and B, and the difference that C is the two, i.e. C=B-A, then
After acquiring C, obtained further according to the linearly related equation between the free chlorine number measured in advance and absorbance value described to be detected
NCl in room air3Mass concentration；
The vacuum pump and spinner flowmeter are set to the end of the detection device, for manufacturing negative pressure in detection process,
Room air to be detected is enable to enter the absorption bottle.
2. NCl in air according to claim 13Detection device, which is characterized in that
The absorbing liquid is specifically dissolved in 15ml pure water by 1gKI and is formed.
3. NCl in air according to claim 1 or claim 23Detection device, which is characterized in that
When the absorption bottle is using the pure water solution of excess KI as when absorbing liquid, NCl3Strong oxidizing property by KI I- aoxidize
For I2, and I2It is complexed to form I with I-3, displaing yellow, NCl in shade and room air3Mass concentration it is directly proportional,
Involved in reaction equation include：
2NCl3+6OH-—N2+3OCl-+3Cl-+3H2O
OCl-+2I-+H2O—Cl-+I2+2OH-
I2+I--I3 -
And the portable spectrophotometer carries out the detection of absorbance value under 350nm wavelength.
4. NCl in air according to claim 13Detection device, which is characterized in that the absorption bottle is using starch-KI
Pure water solution substitutes the pure water solution of excess KI as absorbing liquid, at this time NCl3Strong oxidizing property the I- in KI is oxidized to I2, I2
Aobvious blue, shade and NCl in room air is complexed with starch3Mass concentration it is directly proportional, the reaction side being directed to
Formula includes：
2NCl3+6OH-—N2+3OCl-+3Cl-+3H2O
OCl-+2I-+H2O—Cl-+I2+2OH-
And the portable spectrophotometer carries out the detection of absorbance value under 570nm wavelength.
5. NCl in air according to claim 13Detection device, which is characterized in that the free chlorine number measured in advance
Linearly related equation between absorbance value is specially：
Y=0.4092x-0.0039
In formula, x is the free chlorine number c of DPD-KI in-situ check and test methods；
Y is the absorbance value c of excess KI method absorbing liquids1。
6. NCl in air according to claim 13Detection device, which is characterized in that
The flow control of the spinner flowmeter is 1L/min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610084787.3A CN105548053B (en) | 2016-02-14 | 2016-02-14 | NCl in a kind of air3Detection device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610084787.3A CN105548053B (en) | 2016-02-14 | 2016-02-14 | NCl in a kind of air3Detection device |
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| CN105548053B true CN105548053B (en) | 2018-08-14 |
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| CN107831125A (en) * | 2017-12-08 | 2018-03-23 | 芬欧汇川(中国)有限公司 | System for detecting corrosive gas concentration in air |
| FR3094794B1 (en) | 2019-04-04 | 2021-07-16 | Institut National De Rech Et De Securite Inrs | Device and method for measuring trichloramine concentration |
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| SU1168852A1 (en) * | 1983-07-01 | 1985-07-23 | Предприятие П/Я В-2287 | Method of determining nitrogen trichloride |
| FR2969295B1 (en) * | 2010-12-16 | 2012-12-14 | Commissariat Energie Atomique | MULTIFUNCTIONAL DETECTOR OF GASEOUS COMPOUNDS AND APPLICATIONS THEREOF |
| CN104596995A (en) * | 2014-12-25 | 2015-05-06 | 北京农业智能装备技术研究中心 | Device and method for measuring chlorine elements in water in real time |
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