Membrane entrance mass spectrometer based method for analyzing content of dissolved nitrogen isotope

A nitrogen isotope and mass spectrometer technology, applied in the field of isotope analysis, can solve the problems of high analysis cost, error, long analysis period, etc., and achieve the effect of short analysis time, stable standard curve and low analysis cost

Active Publication Date: 2015-03-18
EAST CHINA NORMAL UNIV
View PDF1 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, how to accurately and quickly analyze dissolved nitrogen (NH 4 + , NO 3 - ) isotope ratio has always been a major technical problem in the world, and it also greatly limits the application of nitrogen isotope tracer technology
Although NH in the water sample 4 + , NO 3 - After a series of biochemical reactions, the stable isotope mass spectrometer can be used to determine the isotope ratio bet

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Membrane entrance mass spectrometer based method for analyzing content of dissolved nitrogen isotope
  • Membrane entrance mass spectrometer based method for analyzing content of dissolved nitrogen isotope
  • Membrane entrance mass spectrometer based method for analyzing content of dissolved nitrogen isotope

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] The technical solution of the present invention will be further described in detail below in conjunction with specific embodiments.

[0030] The oxidant hypobromite iodine solution required by the present invention is self-configured before use. After the preparation is completed, it needs to be stored at a low temperature below 5°C, and its effective time can last for three to four weeks.

[0031] The oxidizing agent used in the embodiment of the present invention---hypobromite iodine solution is prepared according to the following steps: at first the 600ml concentration is 16mol L -1 The NaOH solution is placed in the ice-water mixture, keeping its temperature below 5°C; then, 120ml of bromine water (Br 2 ) into the NaOH solution drop by drop. During the addition process, keep stirring and keep the temperature below 5°C; after that, put the mixed solution in the refrigerator (temperature 3-5°C), and filter out NaBr after standing for 1 week. crystallization, and afte...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

A membrane entrance mass spectrometer based method for analyzing content of dissolved nitrogen isotope comprises the following steps: 1, introducing helium into the liquid to be tested for 20 min to remove nitrogen dissolved in water; 2, adding an oxidant iodine hypobromite solution in the liquid to be tested with nitrogen removed to oxidize ammonia nitrogen into nitrogen; 3, determining a standard curve through a standard sample membrane entrance mass spectrometer; 4, measuring the liquid to be tested from the step 2 by the membrane entrance mass spectrometer, and calculating the content of nitrogen isotope in the ammonia nitrogen liquid; 5, removing the original ammonia nitrogen in the liquid to be tested treated in the step 2 by magnesium oxide, acidifying with sulfuric acid, then reducing nitrate to ammonia nitrogen by zinc powder, and then use the above step 2 to step 4 to obtain the content of nitrate nitrogen isotope in the solution. The method provided by the invention can fast and accurately measure and analyze the content of dissolved nitrogen isotope, and is conducive to promoting the application of nitrogen isotope tracer technique.

Description

technical field [0001] The invention relates to the technical field of isotope analysis, in particular to a method for analyzing dissolved nitrogen isotope content based on a membrane inlet mass spectrometer. Background technique [0002] Affected by the activities of industrial and agricultural production, a large amount of reactive nitrogen from anthropogenic sources has been input into the Earth's surface system. The enrichment of a large amount of reactive nitrogen in the earth's surface system has caused huge ecological and environmental hazards to aquatic ecosystems, such as water eutrophication, harmful algal blooms, and seasonal or permanent hypoxia. One of the most serious environmental problems facing mankind. Therefore, it is a hot scientific issue in the field of geosciences to study the biogeochemical cycle process and influence mechanism of nitrogen. Isotope tracer is currently the most ideal technique to study the transfer and transformation of nitrogen in a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01N27/62
Inventor 侯立军刘敏尹国宇郑艳玲
Owner EAST CHINA NORMAL UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap