On-line measuring system and measuring method for concentration of nitrous acid and nitrous acid

A nitrous acid and nitrite technology, which is applied in the measurement of color/spectral characteristics and the preparation of samples for testing, etc., can solve the problems of high detection limit, inaccurate HONO concentration value, and unsatisfactory HONO measurement, and achieve convenient delivery effect

Pending Publication Date: 2017-08-18
INST OF CHEM CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the above methods face some limitations. On the one hand, there are many interfering gases, which may lead to inaccurate measured HONO con

Method used

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  • On-line measuring system and measuring method for concentration of nitrous acid and nitrous acid
  • On-line measuring system and measuring method for concentration of nitrous acid and nitrous acid
  • On-line measuring system and measuring method for concentration of nitrous acid and nitrous acid

Examples

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Effect test

Embodiment 1

[0067] A real-time online measurement system for nitrous acid and nitric acid concentration, such as figure 1 As shown, the system includes an external sampling unit, a liquid-phase chemical conversion unit and an optical absorption detection unit connected in sequence; the external sampling unit is used for nitrogen-containing compound sampling; the liquid-phase chemical conversion unit is used for The nitrogen-containing compound in the sampling unit is absorbed and converted into nitrite; the optical absorption detection unit is used to convert the nitrite from the liquid-phase chemical conversion unit into an ultraviolet-visible absorbing substance, and perform optical detection;

[0068] The external sampling unit includes a gas phase sampling unit and a liquid phase sampling unit; when performing gas phase nitrous acid and nitric acid concentration online detection, the third two-way valve and the fourth two-way valve are closed, and the first two-way valve is opened. va...

Embodiment 2

[0097] A real-time online measurement system for nitrous acid and nitric acid concentration, such as figure 1 As shown, the system includes an external sampling unit, a liquid-phase chemical conversion unit and an optical absorption detection unit connected in sequence; the external sampling unit is used for nitrogen-containing compound sampling; the liquid-phase chemical conversion unit is used for The nitrogen-containing compound in the sampling unit is absorbed and converted into nitrite; the optical absorption detection unit is used to convert the nitrite from the liquid-phase chemical conversion unit into an ultraviolet-visible absorbing substance, and perform optical detection;

[0098] The external sampling unit includes a gas phase sampling unit and a liquid phase sampling unit; when performing online detection of nitrite and nitrate concentrations in the liquid phase, open the third two-way valve and the fourth two-way valve, Close the first two-way valve and the seco...

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Abstract

The invention discloses an on-line measuring system and a measuring method for concentration of nitrous acid and nitrous acid. The system comprises an external sample feeding unit, a liquid phase chemical conversion unit and an optical absorption detection unit which are connected in sequence, wherein the external sample feeding unit is used for feeding a sample of a nitrogen-containing compound; the liquid phase chemical conversion unit is used for absorbing and converting the liquid phase chemical conversion unit from the external sample feeding unit into nitrite; and the optical absorption detection unit is used for converting the nitrite from the liquid phase chemical conversion unit into an ultraviolet-visible absorbent material, and used for implementing optical detection. By adopting the system, simultaneous measurement of the nitrous acid and the nitric acid can be achieved, and furthermore interference of other gaseous phase substances can be eliminated through parallel channels. By adopting the system, trace detection on the nitrous acid and the nitric acid in the atmosphere can be achieved, and trace detection on the nitrous acid and the nitric acid in water bodies is also achieved, the detection sensitivity is greater than 10pptv and 0.03mu g/L, the response time is less than 3-5 minutes, and the system can be applied to atmospheric environments, water body environment monitoring, experimental scientific research and the like.

Description

technical field [0001] The invention relates to the field of atmospheric environment detection and experimental scientific research, in particular to a real-time on-line measurement system and method for the concentration of nitrous acid and nitric acid. Background technique [0002] Nitrous acid (HONO) is a trace nitrogen-containing substance in the atmosphere, and it is also a typical secondary pollutant. Its concentration can be used as an indicator to directly reflect the degree of urban air pollution. nitric acid (HNO 3 ) is an important oxidation product of nitrogen oxides in the atmosphere, which can be generated by free radical reactions, and can also be produced by the hydrolysis of nitrogen pentoxide, which affects the global environment through dry and wet deposition while affecting the atmospheric nitrogen cycle. With the frequent occurrence of urban smog events, the research on gaseous nitrous acid and nitric acid has increasingly become a hot topic. However, d...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N1/28
CPCG01N1/28G01N21/31
Inventor 王炜罡彭超葛茂发陈炎
Owner INST OF CHEM CHINESE ACAD OF SCI
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