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Method for measuring isotope ratio of ammonium nitrogen in atmospheric aerosol based on chemical conversion

An atmospheric aerosol and isotope ratio technology, applied in measuring devices, scientific instruments, instruments, etc., can solve the problems of low ammonium salt concentration, pollution, etc., and achieve the effect of simple reaction process, high safety and easy operation

Inactive Publication Date: 2018-10-19
NANJING UNIV OF INFORMATION SCI & TECH
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Problems solved by technology

Ammonium concentration is very low in clean weather, affected by atmospheric N 2 pollution, converted to N by combustion oxidation 2 Traditional methods of determining isotope ratios are not suitable for low-level samples

Method used

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  • Method for measuring isotope ratio of ammonium nitrogen in atmospheric aerosol based on chemical conversion
  • Method for measuring isotope ratio of ammonium nitrogen in atmospheric aerosol based on chemical conversion
  • Method for measuring isotope ratio of ammonium nitrogen in atmospheric aerosol based on chemical conversion

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Embodiment Construction

[0035]The following describes the substantive content of the present invention in detail in conjunction with the drawings and embodiments, but does not limit the protection scope of the present invention.

[0036] A kind of chemical conversion method of ammonium nitrogen isotope ratio determination in atmospheric aerosol, method comprises following several steps (as figure 1 shown):

[0037] (1) Use ion chromatography (Thermo Scientific) to measure the content of ammonium ions in the sample. According to the calculation, use a cutter with a specific diameter to cut the atmospheric sample film into a 20ml glass bottle and add 5ml deionized water to it to ensure the extraction The solution contains more than 1.25 μg of Put the glass bottle filled with the sample film and deionized water into an ultrasonic water bath oscillator and ultrasonically vibrate for 30 min at room temperature.

[0038] (2) Extract the shaken sample and filter it with a needle filter of 0.22 μm. Accor...

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Abstract

The invention discloses a method for measuring isotope ratio of ammonium nitrogen in atmospheric aerosol based on chemical conversion, comprising the following steps: analyzing mass concentration of NH4<+> in an atmospheric aerosol sample by ion chromatography; filtering and extracting the sample by an ultrasonic oscillator to form 0.25 microgram NH4<+> / ml solution; oxidizing NH4<+> with alkalinehypobromite into NO2<->; reducing NO2<-> with hydroxylamine hydrochloride into N2O at pH of less than 0.3; measuring N2O nitrogen isotope ratio by Precon + GasBench II+IRMS combination; and establishing a standard curve and calculating nitrogen isotope ratio of NH4<+> in the atmospheric aerosol sample. The method of the invention has the following advantages: result accuracy is high, and accuracyafter repeating for 10 times reaches 0.005%.

Description

technical field [0001] The invention relates to a chemical conversion method for measuring the nitrogen isotope ratio of ammonium salt in atmospheric aerosol, the accuracy reaches 0.05‰, and realizes the accurate determination of the nitrogen isotope ratio of ammonium salt in atmospheric aerosol samples. Background technique [0002] With the rapid development of my country's economy and society in a short period of time, the phenomenon of haze has become increasingly serious, and continuous haze events are usually accompanied by very high concentrations of fine particulate matter (PM 2.5 ). Haze weather has an important impact on human health, environmental quality and climate change. The most abundant alkaline gas in the atmosphere—ammonia (NH 3 ), because it is very easy to react with sulfuric acid (H 2 SO 4 ) and nitric acid (HNO 3 ) and other neutralization reactions to generate secondary inorganic aerosol pollutants mainly composed of ammonium sulfate, ammonium bi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/96
CPCG01N30/96
Inventor 章炎麟项妍琨曹芳
Owner NANJING UNIV OF INFORMATION SCI & TECH
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