Pyrolysis and thermal-oxidation characterization of organic carbon and black carbon aerosols.
Pyrolysis and thermal-oxidation characterization of organic carbon and black carbon aerosols.
复制标题
有机碳和黑碳气溶胶的热解和热氧化表征。
DOI：
10.1016/j.scitotenv.2011.07.016
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Fengfu Fu
中科院分区：
文献类型：
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作者：
Mingyu Jiang;Yiqing Wu;G. Lin;Liangjun Xu;Zhuling Chen;Fengfu Fu
研究了有机碳（OC）、热解生成的元素碳（PEC）和黑碳（BC）颗粒在惰性气氛和空气气氛中的热解行为和热氧化分解特性，建立了热氧化法测定BC的PEC校正新方法。我们的结果表明：1）在400°C惰性气氛下加热，一部分OC被脱除，另一部分OC被炭化，形成PEC，而BC颗粒的重量在相同条件下基本不变。2)PEC和BC在空气中的分解温度相近。但在空气气氛中，PEC和BC的分解速率有很大差异，且差异随温度的变化而变化。在500°C的空气气氛中，PEC的分解速率最大为BC的5.64倍。基于PEC和BC分解速率的差异，提出了一种新的热氧化法PEC校正方法。利用新的PEC校正方法和热分析仪，成功地测定了实际烟尘样品和人工烟尘样品中OC和BC的浓度。结果表明，本文提出的PEC修正方法与真实的值和热光法分析的结果吻合较好，具有较高的精度。
In this study, the pyrolytic behaviors and the thermal-oxidation decomposition characteristics of organic carbon (OC), pyrolytically generated elemental carbon (PEC) and black carbon (BC) particles have been studied in inert and air atmosphere respectively, in order to develop a new PEC correction method for the determination of BC by using thermal oxidation method. Our results indicated that: 1) a part of OC can be removed by heating it at 400°C in inert atmosphere and another part of OC was charred to form PEC, whereas, the weight of BC particles approximately keeps no change in the same conditions. 2) PEC and BC began to decompose at a similar temperature in air atmosphere. However, the decomposition rate of PEC is quite different from that of BC in air atmosphere and the difference varied with the temperature. As maximum, the decomposition rate of PEC is 5.64 times faster than that of BC particles at 500°C in air atmosphere. Based on the difference of the decomposition rate between PEC and BC, a new method of PEC correction was developed for the thermal oxidation method. With the help of the new PEC correction method and thermal analyzer, we successfully determined OC and BC concentrations in actual soot sample and artificial soot samples. The results obtained with our PEC correction method are consistent well with the real value or those analyzed with thermal-optical method, suggesting that the novel PEC correction method have a high accuracy.