Spectrophotometric detector for detecting methanal and ammonia in air

A spectrophotometric and detector technology, applied in the measurement of color/spectral characteristics, etc., can solve the problems of inconvenient operation, time-consuming and labor-intensive

Inactive Publication Date: 2013-12-25
武汉分析仪器厂
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the existing spectrophotometric detector has only one set wavelength and can only measure one harmful gas in the air. When performing a comprehens

Method used

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  • Spectrophotometric detector for detecting methanal and ammonia in air
  • Spectrophotometric detector for detecting methanal and ammonia in air
  • Spectrophotometric detector for detecting methanal and ammonia in air

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: as figure 1 Shown, a kind of spectrophotometric detector that is used to detect formaldehyde and ammonia in the air, comprises the bottle cover 1 that is made up of base 1a and light-shielding cap 1b, is located at the cylindrical spectrophotometric detection bottle 2 inside bottle cover 1, and design On the side wall of the base 1a and located on both sides of the spectrophotometric detection bottle 2, the photosensitive sensor 4 and the light-emitting diode 3 for emitting detection light and converging the detection light on the photosensitive sensor 4, the light-emitting diode 3 and A light-shielding adhesive tape 5 is arranged on the photosensitive sensor 4 . The light-emitting diode 3 is composed of a 412nm light-emitting diode 3a and a 630nm light-emitting diode 3b. The included angle between the LEDs 3b is 15 degrees. At this time, the detection light emitted by the 412nm LED 3a and the 630nm LED 3b respectively passes through the spectrophotometri...

Embodiment 2

[0019] Embodiment 2: as figure 2 and image 3 As shown, the structure is the same as that of Example 1, the difference is: the 412nm light-emitting diode 3a and the 630nm light-emitting diode 3b are arranged left and right along the horizontal direction, and the 412nm light-emitting diode 3a and the 630nm light-emitting diode 3b The angle between them is 10 degrees. With this arrangement, the detection light emitted by the 412nm light-emitting diode 3a and the 630nm light-emitting diode 3b is easier to converge on the photosensitive sensor 4, and the processing difficulty is less.

[0020] When in use, first open the light-shielding cap 1b, add the absorbing liquid that has absorbed the harmful gas in the spectrophotometric detection bottle 2, add a color indicator to develop the color, open the light-emitting diode 3, if the formaldehyde is measured by the phenol reagent method, then Open 630nm light-emitting diode 3b; If measure formaldehyde with acetylacetone method, the...

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PUM

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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 [0001] The invention belongs to the technical field of environmental harmful gas detection, and in particular relates to a spectrophotometric detector for detecting formaldehyde and ammonia in the air. Background technique [0002] Many decorative materials contain benzene, formaldehyde, chlorinated hydrocarbons, ammonia and other harmful substances, among which formaldehyde is the first pollution, which will seriously endanger human health. Ammonia pollution is mainly concentrated in buildings where ammonia-containing antifreeze is used in structural construction, and the ammonia content in severely polluted air can reach up to 0.5mg / m 3 . [0003] The existing air quality detection method is to first collect gas with a gas sampler, absorb harmful substances into the unit volume of absorption liquid with an absorption bottle filled with absorption liquid, add a color indicator to develop color, and then use a set constant The wavelength spectrophotometer m...

Claims

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Application Information

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IPC IPC(8): G01N21/31
Inventor 刘立明赵培宇王胜利
Owner 武汉分析仪器厂
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