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Title: Distinguishing 'new' from 'old' organic carbon on reclaimed coal mine sites using thermogravimetry: I. Method development

Abstract

Reclaimed coal mine sites represent a potential terrestrial carbon (c) sink. However, there is currently no cost-effective, rapid, and reliable method to quantify soil organic matter accumulation in soils containing appreciable quantities of coal and carbonate media. The derivative thermogravimetry method was evaluated as a potential analytical tool for differentiating C in spoils that may contain both recently derived and ancient ('old') C fractions. Grass litter and coal were used to represent 'new' and 'old' organic C, respectively, and limestone to represent the carbonate fraction. Derivative thermogravimetry curves showed pyrolysis peaks at distinctively different temperatures: grass litter, 270 to 395{sup o}C; coal, 415 to 520{sup o}C; limestone, 700 to 785{sup o}C. Recoveries from mixtures of these three components at the 95% confidence interval were found to be 94.49% {+-} 4.23% (coal), 93.67% {+-} 2.11% (litter), and 108.88% {+-} 2.88% (limestone). Petrographic analysis was used to validate derivative thermogravimetry findings. The results indicate that organic petrography can be a useful approximation of 'new' organic C, but particle density differences and time constraints might limit it. Thermogravimetry appears to be the superior of the two methods as it proved to be a more cost-effective, rapid, and direct method for differentiating and quantifyingmore » C.« less

Authors:
; ; ; ;  [1]
  1. University of Kentucky, Lexington, KY (United States). Dept. of Forestry
Publication Date:
OSTI Identifier:
20905909
Resource Type:
Journal Article
Resource Relation:
Journal Name: Soil Science; Journal Volume: 172; Journal Issue: 4
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; CARBON; SOILS; LAND RECLAMATION; COAL MINING; THERMAL GRAVIMETRIC ANALYSIS; COAL; CARBONATES; GRAMINEAE; PETROGRAPHY; CARBON SEQUESTRATION; BUILDUP; REVEGETATION; LIMESTONE

Citation Formats

Maharaj, S., Barton, C.D., Karatkanasis, T.A.D., Rowe, H.D., and Rimmer, S.M. Distinguishing 'new' from 'old' organic carbon on reclaimed coal mine sites using thermogravimetry: I. Method development. United States: N. p., 2007. Web. doi:10.1097/SS.0b013e31803146e8.
Maharaj, S., Barton, C.D., Karatkanasis, T.A.D., Rowe, H.D., & Rimmer, S.M. Distinguishing 'new' from 'old' organic carbon on reclaimed coal mine sites using thermogravimetry: I. Method development. United States. doi:10.1097/SS.0b013e31803146e8.
Maharaj, S., Barton, C.D., Karatkanasis, T.A.D., Rowe, H.D., and Rimmer, S.M. Sun . "Distinguishing 'new' from 'old' organic carbon on reclaimed coal mine sites using thermogravimetry: I. Method development". United States. doi:10.1097/SS.0b013e31803146e8.
@article{osti_20905909,
title = {Distinguishing 'new' from 'old' organic carbon on reclaimed coal mine sites using thermogravimetry: I. Method development},
author = {Maharaj, S. and Barton, C.D. and Karatkanasis, T.A.D. and Rowe, H.D. and Rimmer, S.M.},
abstractNote = {Reclaimed coal mine sites represent a potential terrestrial carbon (c) sink. However, there is currently no cost-effective, rapid, and reliable method to quantify soil organic matter accumulation in soils containing appreciable quantities of coal and carbonate media. The derivative thermogravimetry method was evaluated as a potential analytical tool for differentiating C in spoils that may contain both recently derived and ancient ('old') C fractions. Grass litter and coal were used to represent 'new' and 'old' organic C, respectively, and limestone to represent the carbonate fraction. Derivative thermogravimetry curves showed pyrolysis peaks at distinctively different temperatures: grass litter, 270 to 395{sup o}C; coal, 415 to 520{sup o}C; limestone, 700 to 785{sup o}C. Recoveries from mixtures of these three components at the 95% confidence interval were found to be 94.49% {+-} 4.23% (coal), 93.67% {+-} 2.11% (litter), and 108.88% {+-} 2.88% (limestone). Petrographic analysis was used to validate derivative thermogravimetry findings. The results indicate that organic petrography can be a useful approximation of 'new' organic C, but particle density differences and time constraints might limit it. Thermogravimetry appears to be the superior of the two methods as it proved to be a more cost-effective, rapid, and direct method for differentiating and quantifying C.},
doi = {10.1097/SS.0b013e31803146e8},
journal = {Soil Science},
number = 4,
volume = 172,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}