CN103472016A - Spectrophotometric detector for detecting methanal and ammonia in air - Google Patents
Spectrophotometric detector for detecting methanal and ammonia in air Download PDFInfo
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- CN103472016A CN103472016A CN2013104266993A CN201310426699A CN103472016A CN 103472016 A CN103472016 A CN 103472016A CN 2013104266993 A CN2013104266993 A CN 2013104266993A CN 201310426699 A CN201310426699 A CN 201310426699A CN 103472016 A CN103472016 A CN 103472016A
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Abstract
The invention discloses a spectrophotometric detector for detecting methanal and ammonia in air. The spectrophotometric detector comprises a bottle sleeve, a cylindrical spectrophotometric detecting bottle, a photosensitive sensor and a light emitting diode, wherein the bottle sleeve is composed of a base and a shading cap, and the cylindrical spectrophotometric detecting bottle is arranged in the bottle sleeve; the photosensitive sensor is arranged on the side wall of the base and positioned at one side of the spectrophotometric detecting bottle; the light emitting diode is used for emitting detecting light and gathering the detecting light onto the photosensitive sensor; shading rubberized fabrics are arranged on the light emitting diode and the photosensitive sensor; the light emitting diode is composed of a 412nm light emitting diode and a 630nm light emitting diode. The spectrophotometric detector integrates a phenol reagent method and a diacetone method for detecting methanal and a Nessler reagent method for detecting ammonia and can freely switch the methods as required in use, so that the detection efficiency is greatly improved, and the labor intensity of detection is reduced.
Description
Technical field
The invention belongs to environment harmful gas detection technique field, be specifically related to a kind of spectrophotometric detector for detection of formaldehyde in air and ammonia.
Background technology
All contain the objectionable impuritiess such as benzene, formaldehyde, chlorinated hydrocabon, ammonia in many ornament materials, first of wherein formaldehyde is pollution, understand the serious harm health.And ammonia pollution mainly concentrates in structure construction in the buildings of using containing the freeze-point depressant of ammonia, with serious pollution Ammonia in Air content can reach 0.5mg/m
3.
Existing Detection of Air Quality method is first with gas sampler, to gather gas, with the absorption bottle that absorption liquid is housed, objectionable impurities is absorbed in the absorption liquid of unit volume, add the colored indicator colour developing, then use the absorbance of its chromophoric solution of the long spectrophotometric instrumentation of standing wave of setting, machine calculates as calculated, obtains the amount that contains objectionable impurities in unit volume gas.
But existing spectrophotometric detector only has the wavelength of a setting, can only measure airborne a kind of harmful gas, when being carried out to complete detection, air quality need to ceaselessly change spectrophotometric detector, and operate very inconvenient and waste time and energy.
Summary of the invention
The objective of the invention is for above-mentioned defect, a kind of two setting wavelength that are provided with are provided, can be used in and detect two kinds of harmful gases---the spectrophotometric detector of formaldehyde and ammonia.
Above-mentioned purpose is achieved through the following technical solutions:
A kind of spectrophotometric detector for detection of formaldehyde in air and ammonia, comprise the bottle cover formed by base and sun-shading cap, be located at the spectrophotomelric assay bottle of bottle cover inside, and be located on base side wall and lay respectively at the light sensor of spectrophotomelric assay bottle both sides and converge in the light emitting diode on light sensor for sending to detect light and will detect light, described light emitting diode and light sensor are provided with the shading adhesive plaster, it is characterized in that: described light emitting diode is comprised of 412nm light emitting diode and 630nm light emitting diode.
Described 412nm light emitting diode and 630nm light emitting diode be lower the setting in the vertical direction, and the angle between 412nm light emitting diode and 630nm light emitting diode is the 10-30 degree.
Described 412nm light emitting diode and 630nm light emitting diode along continuous straight runs left and right arrange, and the angle between 412nm light emitting diode and 630nm light emitting diode is the 5-15 degree.
Described spectrophotomelric assay bottle is cylindrical.
The lower edge of described sun-shading cap is provided with turning slot, and the upper edge of described base is provided with the revolution seam matched with turning slot.
At present, method for determining formaldehyde in air mainly contains two kinds, and a kind of is the phenol reagent spectrophotometric method, and detecting wavelength is 630nm(GB/T18204 26-2000), a kind of is the diacetone spectrophotometric method, the detection wavelength is 412nm(GB/T15516-1995).Survey airborne ammonia nessler reagent spectrophotometric method, detecting wavelength is 420nm(GB/T18204 25-2000).By analyzing, when 412nm wavelength light transmission nessler reagent method is surveyed the ammonia chromophoric solution, more than 90% of absorption peak when its absorbance is 420nm wavelength light transmission nessler reagent method survey ammonia chromophoric solution, meet Measurement Resolution and accuracy requirement, therefore, ammonia and formaldehyde can share the light emitting diode detection of a 412nm wavelength.It is integrated that the present invention will survey the nessler reagent method of phenol reagent process, acetylacetone method and survey ammonia of formaldehyde, can freely switch as required during use, thereby significantly improve detection efficiency, reduce detection time and labour intensity.
The accompanying drawing explanation
Fig. 1 is the cross-sectional view of the embodiment of the present invention 1;
Fig. 2 is the cross-sectional view of the embodiment of the present invention 2;
Fig. 3 is that the B-B of the embodiment of the present invention 2 is to cross-sectional view.
In figure: 1-bottle cover (1a-base, 1b-sun-shading cap, 1c-revolution seam, 1d-turning slot), 2-spectrophotomelric assay bottle, 3-light emitting diode (3a-412nm light emitting diode, 3b-630nm light emitting diode), 4-light sensor, 5-shading adhesive plaster.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in detail.
Embodiment 1: as shown in Figure 1, a kind of spectrophotometric detector for detection of formaldehyde in air and ammonia, comprise the bottle cover 1 formed by base 1a and sun-shading cap 1b, be located at the cylindrical spectrophotomelric assay bottle 2 of bottle cover 1 inside, and be located on base 1a sidewall and lay respectively at the light sensor 4 of spectrophotomelric assay bottle 2 both sides and converge in the light emitting diode 3 on light sensor 4 for sending to detect light and will detect light, described light emitting diode 3 and light sensor 4 are provided with shading adhesive plaster 5.Described light emitting diode 3 is comprised of 412nm light emitting diode 3a and 630nm light emitting diode 3b, 412nm light emitting diode 3a and 630nm light emitting diode 3b be lower the setting in the vertical direction, angle between 412nm light emitting diode 3a and 630nm light emitting diode 3b is 15 degree, and the detection light that now 412nm light emitting diode 3a and 630nm light emitting diode 3b send respectively just in time converges on light sensor 4 through after spectrophotomelric assay bottle 2.For effective lucifuge, prevent that light from entering spectrophotomelric assay bottle 2 and testing result is exerted an influence, be provided with the turning slot 1d of annular on the lower edge of described sun-shading cap 1b, the upper edge of described base 1a is provided with the annular revolution seam 1c matched with turning slot 1d.
Embodiment 2: as shown in Figures 2 and 3, structure is identical with embodiment 1, difference is: described 412nm light emitting diode 3a and 630nm light emitting diode 3b along continuous straight runs left and right arrange, and the angle between 412nm light emitting diode 3a and 630nm light emitting diode 3b is 10 degree.Adopt this set, the detection light that 412nm light emitting diode 3a and 630nm light emitting diode 3b send more easily converges on light sensor 4, and difficulty of processing is less.
During use, first open sun-shading cap 1b, in spectrophotomelric assay bottle 2, add the absorption liquid that has absorbed harmful gas, add the colored indicator colour developing, open light emitting diode 3, if survey formaldehyde with phenol reagent process, open 630nm light emitting diode 3b; If survey formaldehyde with acetylacetone method, open 412nm light emitting diode 3a; If survey ammonia by the nessler reagent method, open 412nm light emitting diode 3a, survey the absorbance of chromophoric solution, machine calculates as calculated, and the amount that obtains containing objectionable impurities in unit volume gas is concentration.
Claims (5)
1. the spectrophotometric detector for detection of formaldehyde in air and ammonia, comprise the bottle cover (1) formed by base (1a) and sun-shading cap (1b), be located at the inner spectrophotomelric assay bottle (2) of bottle cover (1), and be located on base (1a) sidewall and lay respectively at the light sensor (4) of spectrophotomelric assay bottle (2) both sides and converge in the light emitting diode (3) on light sensor (4) for sending to detect light and will detect light, described light emitting diode (3) and light sensor (4) are provided with shading adhesive plaster (5), it is characterized in that: described light emitting diode (3) is comprised of 412nm light emitting diode (3a) and 630nm light emitting diode (3b).
2. the spectrophotometric detector for detection of formaldehyde in air and ammonia according to claim 1, it is characterized in that: described 412nm light emitting diode (3a) and 630nm light emitting diode (3b) be lower the setting in the vertical direction, and the angle between 412nm light emitting diode (3a) and 630nm light emitting diode (3b) is the 10-30 degree.
3. the spectrophotometric detector for detection of formaldehyde in air and ammonia according to claim 1, it is characterized in that: described 412nm light emitting diode (3a) and 630nm light emitting diode (3b) along continuous straight runs left and right arrange, and the angle between 412nm light emitting diode (3a) and 630nm light emitting diode (3b) is the 5-15 degree.
4. according to any one described spectrophotometric detector for detection of formaldehyde in air and ammonia of claim 1-3, it is characterized in that: described spectrophotomelric assay bottle (2) is for cylindrical.
5. according to any one described spectrophotometric detector for detection of formaldehyde in air and ammonia of claim 1-3, it is characterized in that: the lower edge of described sun-shading cap (1b) is provided with turning slot (1d), and the upper edge of described base (1a) is provided with the revolution seam (1c) matched with turning slot (1d).
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| CN2013104266993A CN103472016A (en) | 2013-09-17 | 2013-09-17 | Spectrophotometric detector for detecting methanal and ammonia in air |
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| CN2013104266993A CN103472016A (en) | 2013-09-17 | 2013-09-17 | Spectrophotometric detector for detecting methanal and ammonia in air |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949919A (en) * | 2014-03-31 | 2015-09-30 | 苏州科技学院 | Method for detecting and controlling concentration of sulfur trioxide gas |
| CN106053367A (en) * | 2016-07-04 | 2016-10-26 | 华南理工大学 | Method for improving stability and sensitivity in content detection of formaldehyde in cosmetics |
| CN108444999A (en) * | 2018-06-20 | 2018-08-24 | 青岛新纪元检测评价有限公司 | The method that Berthelot spectrophotometry measures ammonia-nitrogen content in air |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949919A (en) * | 2014-03-31 | 2015-09-30 | 苏州科技学院 | Method for detecting and controlling concentration of sulfur trioxide gas |
| CN106053367A (en) * | 2016-07-04 | 2016-10-26 | 华南理工大学 | Method for improving stability and sensitivity in content detection of formaldehyde in cosmetics |
| CN108444999A (en) * | 2018-06-20 | 2018-08-24 | 青岛新纪元检测评价有限公司 | The method that Berthelot spectrophotometry measures ammonia-nitrogen content in air |
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Application publication date: 20131225 |