An evaluation of thermal resistance as a measure of black carbon content in diesel soot, wood char, and sediment

被引:147
作者
Nguyen, TH [1 ]
Brown, RA [1 ]
Ball, WP [1 ]
机构
[1] Johns Hopkins Univ, Dept Geog & Environm Engn, Baltimore, MD 21218 USA
基金
美国国家科学基金会;
关键词
D O I
10.1016/j.orggeochem.2003.09.005
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The time dependence and efficacy of pretreatment by chemothermal oxidation for estimating black carbon (BC) content was evaluated using 28 samples of wood char, soot, activated carbon, and sediment. For 19 wood chars, 24-h carbon survival under air (at 375degreesC) varied between 0 and 44%, with no survival in any char formed at less than or equal to 850degreesC and even in some low H/C chars formed at 1000degreesC. Results depended not only on extent of carbonization, but also on physical attributes of particles. Because not all environmentally relevant BC is detected, the method is perhaps best considered as a semi-quantitative measure of soot content. (C) 2003 Elsevier Ltd. All rights reserved.
引用
收藏
页码:217 / 234
页数:18
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