Method and device for measuring carbon component in atmospheric particulates by means of hot-hydrogen
A technology for atmospheric particulate matter and particulate matter, which is applied to the device for realizing the above method, elemental carbon, and thermal-hydrogen in the field of determination of organic carbon in atmospheric particulate matter. It can solve the problem of crossover of decomposition and oxidation temperature ranges, fixed detection temperature cannot meet the requirements, and reduce accuracy. And other issues
Inactive Publication Date: 2013-06-26
国家环境分析测试中心
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There are many and complex types of carbonaceous particulate matter in the atmosphere. Particulate matter samples are unique due to different sampling locations, time periods, distribution of surrounding pollution sources, and meteorological conditions. At the same time, there are various types of OC and EC, and the decomposition and oxidation temperature ranges overlap. The fixed detection temperature obviously cannot meet the requirements;
[0010] The second is to calculate EC or OC through two measurements and subtraction method, and the error superposition will reduce the accuracy of the measurement
[0016] The third is that the results measured under different heating modes will have great differences.
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[0040] The method for measuring carbonaceous components in atmospheric particles by thermal-hydrogen of the present invention, the main steps are:
[0041] A) thermally decompose the carbonaceous components of the particulate matter in the quartz tube 4 under the atmosphere of pure oxygen as the carrier gas to avoid the generation of cracked carbon; the control of the input amount of the carrier gas is to control the mass flow meter 10 by a computer 9 To achieve this, a float flowmeter 11 can also be connected in series between the mass flowmeter 10 and the quartz tube 4 .
[0042] B) Achieved CO during the entire thermal desorption process 2 , H 2 Simultaneous determination of the O signal (non-dispersive light infrared (NDIR) detection technique).
[0043] C) The CO obtained during the thermal desorption process of the obtained particulate matter sample was analyzed by using the spectral analysis software using the linear heating method. 2 The signal spectrum is subjected...
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The invention discloses a method for measuring the carbon component in atmospheric particulates by means of hot-hydrogen. The method mainly comprises the following steps of: A) thermally analyzing the carbon component in the particulates under the atmosphere of pure oxygen, so as to enable organic carbon and element carbon to be decomposed and oxidized to form CO2 and H2O, and avoid pyrolytic carbon; B) synchronously measuring CO2 singles and H2O singles in the whole process of thermal analysis; C) carrying out spectrogram analysis on a measured CO2 signal spectrogram to obtain a fitting result of a plurality of spectral peaks; D) confirming the organic carbon (OC) oxygenolysis finishing point according to the change of an H / C signal specific value; and E) computing the area of the organic carbon and the area of the element carbon according to the confirmed organic carbon (OC) oxygenolysis finishing point and the CO2 signal spectrogram analysis result, and quantitatively computing the value of the organic carbon and the element carbon in the particulates according to the areas. The invention further discloses a device for realizing the method.
Description
technical field [0001] The present invention relates to a method for measuring atmospheric particulate matter, and more particularly to a thermal-hydrogen method for measuring organic carbon (OC) and elemental carbon (EC) in atmospheric particulate matter. [0002] The invention also relates to a device for implementing the above method. Background technique [0003] Atmospheric particulate matter (atmospheric aerosol) is one of the most important atmospheric pollutants. In recent years, the analysis and characterization of carbonaceous components in atmospheric particulate matter has become an important content in particulate matter research. [0004] Previous studies have shown that carbonaceous particulate matter accounts for 15-20% by weight of total suspended particulate matter (TSP) and 40-60% by weight of fine particles less than 2.5 microns in diameter. Analytical studies of carbonaceous particulate matter can characterize different sources of organic carbon (OC) an...
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Inventor 董树屏刘咸德李玉武刘志强狄一安何涛郭靖杨勇杰任立军于跃周瑞
Owner 国家环境分析测试中心