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Flow injection analysis-based online measurement method and system of atmospheric gaseous nitric acid

A measurement method and flow injection technology, applied in the measurement of color/spectral properties, etc., can solve the problems of poor detection limit, inapplicability, poor selectivity of wet chemical method, etc. of spectroscopic method, achieve low detection limit, easy operation, and improve absorption efficiency Effect

Pending Publication Date: 2017-05-31
PEKING UNIV
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Problems solved by technology

[0004] Existing measurement methods for gaseous nitric acid are mainly divided into optical methods and wet chemical methods. Spectroscopic methods generally have poor detection limits and are basically not suitable for cleaner areas; while existing wet chemical methods generally have poor selectivity

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  • Flow injection analysis-based online measurement method and system of atmospheric gaseous nitric acid
  • Flow injection analysis-based online measurement method and system of atmospheric gaseous nitric acid
  • Flow injection analysis-based online measurement method and system of atmospheric gaseous nitric acid

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Embodiment Construction

[0046] Below in conjunction with accompanying drawing, further describe the present invention through embodiment, but do not limit the scope of the present invention in any way.

[0047] The invention provides an online measurement method and device for atmospheric gaseous nitric acid based on flow injection analysis. Based on flow injection analysis, wet chemical method and spectroscopic method are used to measure the concentration of gaseous nitric acid in the atmosphere, which has low detection limit, high sensitivity, high The characteristics of time and space resolution, high stability, low interference and low cost. figure 1 is a structural diagram of the measuring device provided by the embodiment of the present invention, Figure 5 It is a flow chart of the steps of the atmospheric gaseous nitric acid on-line measurement method based on flow injection analysis of the present invention, and the present embodiment utilizes figure 1 The measuring device adopts the online...

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Abstract

The invention discloses flow injection analysis-based online measurement method and system of atmospheric gaseous nitric acid. On the basis of flow injection analysis, gaseous nitric acid is reduced into nitrous acid by adopting a wet chemistry method combined with a spectroscopic method on the basis of a cadmium column reduction principle; a national standard method for Griess-Saltzman colorimetric detection of nitrite is adopted; nitrite is continuously collected by using a griess reagent on the basis of a flow injection method and is transmitted through a peristaltic pump; colorimetric analysis is carried out on the collected gas sample by combining a long-path liquid-core optical fiber; a gaseous nitric acid signal in the atmosphere is deducted, so that the measurement of the concentration of the gaseous nitric acid in the atmosphere is achieved. The device at least comprises a sampling unit, a gas / liquid transmission unit and a detection unit. The flow injection analysis-based online measurement method and system have the characteristics of being low in detection limit, high in sensitivity, high in spatial and temporal resolution, high in stability, low in interference and low in cost.

Description

technical field [0001] The invention relates to air quality detection technology, in particular to an online measurement method and measurement device for atmospheric gaseous nitric acid based on flow injection analysis. Background technique [0002] Gaseous nitric acid plays an important role in atmospheric chemistry. Its existence involves many atmospheric chemical processes during the day and night. As the final storage of reactive nitrogen compounds, it can enable reactive nitrogen compounds to carry out long-distance transmission pollution; it can increase the concentration of cloud droplets. As a sink of OH radicals and a potential source of gaseous nitrous acid, it directly or indirectly has an important impact on the oxidation and self-purification capabilities of the atmosphere. Air pollution such as acid rain, photochemical smog, condensation of polar stratospheric clouds, and ozone depletion are all closely related to gaseous nitric acid. [0003] Since the first...

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Application Information

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IPC IPC(8): G01N21/31
CPCG01N21/31Y02A50/20
Inventor 陆克定刘禹含杨新平张远航
Owner PEKING UNIV
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