Size exclusion chromatography-combined nitrogen detector and application method

A technology of size exclusion chromatography and detector, which is applied in the field of water quality analysis and detection, can solve the problems of large error, complicated test steps, and low sensitivity, and achieve the effects of reducing attenuation, stable and effective oxidation effect, and low cost

Active Publication Date: 2018-08-17
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The analysis and detection method of dissolved organic nitrogen in the prior art has problems such as low sensitivity, large error and complicated test steps. The present invention aims to provide a nitrogen detector with high sensitivity and good accuracy combined with size exclusion chromatography and its application method

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  • Size exclusion chromatography-combined nitrogen detector and application method
  • Size exclusion chromatography-combined nitrogen detector and application method
  • Size exclusion chromatography-combined nitrogen detector and application method

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Embodiment 1

[0045] This embodiment provides a size exclusion chromatography coupled nitrogen detector, such as figure 1 As shown, the detector includes an oxidation system 1, a nitrate detection system 2, a power supply system 3, and a signal processing and control system 4; the sample to be detected is first separated by size exclusion chromatography and then enters the oxidation system 1 for oxidation treatment. After the nitrogen in the sample is converted into nitrate, it is detected by the nitrate detection system 2; the power supply system 3 provides power for the detector; the signal processing and control system 4 is used for the signal processing and processing of the oxidation system 1 and the nitrate detection system 2 control.

[0046] The basic principle of the detector of the present invention is to use the oxidation system 1 to convert the nitrogen contained in various compounds after separation by size exclusion chromatography into NO 3 - , according to NO 3 - Quantita...

Embodiment 2

[0052] This embodiment is basically the same as Embodiment 1, the difference is:

[0053] The described nitrate detection system 2 is an ultraviolet detector, comprising a flow cell module 201 and an ultraviolet absorption optical detection module 202; its working principle is to adopt continuous light sources such as deuterium lamps or UV-LED lamps to emit ultraviolet light of a specific wavelength, and detect volumetric emission. The ultraviolet absorbance of the mobile phase of resistance chromatography in the wavelength range of 215-230nm and the optical path flow cell of 10-40mm, and the NO concentration according to the corresponding wavelength 3 - The molar absorptivity or unit mass absorptivity of NO 3 - Quantify.

[0054] The nitrate detection system 2 is the outlet of the flow path, wherein the flow cell module 201 is based on the NO 3 - The molar absorptivity or unit mass absorptivity at a specific ultraviolet wavelength is quantitatively detected and an optica...

Embodiment 3

[0060] This embodiment is basically the same as Embodiment 1, the difference is:

[0061] The ultraviolet light intensity monitoring module 103 uses gallium aluminum nitride-based deep ultraviolet photodiodes to monitor the light intensity of the ultraviolet oxidation module 101 in real time, which only responds to ultraviolet rays in the UVC band.

[0062] Described power supply system 3 comprises ultraviolet lamp special power supply 301 and AC-DC power conversion module 302; Described ultraviolet lamp special power supply 301 supplies power for ultraviolet oxidation module 101, and described AC-DC power conversion module 302 is nitrate ( NO 3 - ) The detection system 2, the signal processing and control system 4, and the ultraviolet light intensity monitoring module 103 are powered.

[0063] The reason why the ultraviolet oxidation module 101 and other modules adopt different power supplies for power supply is: the ultraviolet lamp adopted in the ultraviolet oxidation mod...

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Abstract

The invention discloses a size exclusion chromatography-combined nitrogen detector and an application method, which belong to the field of analysis and detection of water quality. The size exclusion chromatography-combined nitrogen detector disclosed by the invention comprises an oxidation system, a nitrate radical detection system, a power system, and a signal processing and control system; afterbeing first separated by size exclusion chromatography, a sample to be detected gets into the oxidation system to undergo oxidation treatment, and after nitrogen in the sample is transformed into nitrate radical, the nitrate radical detection system carries out detection by adopting an ultraviolet absorbance method; the power system supplies power to the detector; and the signal processing and control system is responsible for the signal processing and control of the oxidation system and the nitrate radical detection system. The size exclusion chromatography-combined nitrogen detector can quantitatively analyze total nitrogen, organic nitrogen, nitrate nitrogen and ammonia nitrogen, has the advantages of easiness in operation, rich information and the like, and effectively prevents the problems of great error and negative value generated by subtraction in the conventional organic nitrogen analysis method.

Description

technical field [0001] The invention relates to the field of water quality analysis and detection, in particular to a size exclusion chromatography combined type nitrogen detector and an application method. Background technique [0002] In the process of drinking water and sewage treatment, dissolved organic matter is the main removal object. Analysis and characterization of the composition and properties of dissolved organic matter is an important means of water treatment technology mechanism research. Molecular weight distribution is one of the important properties of dissolved organic matter, which affects the effect of physical and chemical treatment technologies such as coagulation, membrane filtration, advanced oxidation, adsorption and ion exchange. [0003] The analysis and characterization methods of molecular weight distribution characteristics mainly include a series of membrane separation methods and size exclusion chromatography. The former is affected by the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02
CPCG01N30/02G01N21/33G01N30/74G01N30/88G01N2030/025G01N2030/8809
Inventor 李文涛蔡珉晖叶大林夏信群李燕李爱民吴吉春左延婷吴亚萍李大伟宋海欧
Owner NANJING UNIV
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