Black carbon estimation in French calcareous soils using chemo-thermal oxidation method

被引：19

作者：

Caria, G. ^{[1
]}

Arrouays, D. ^{[2
]}

Dubromel, E. ^{[1
]}

Jolivet, C. ^{[2
]}

Ratie, C. ^{[2
]}

Bernoux, M. ^{[3
]}

Barthes, B. G. ^{[3
]}

Brunet, D. ^{[3
]}

Grinand, C. ^{[3
]}

机构：

[1] INRA, Inst Natl Rech Agron, Lab Anal Sols, US 010, F-62000 Arras, France

[2] INRA, Inst Natl Rech Agron, US 1106, F-45075 Orleans 2, France

[3] INRA IRD Montpellier SupAgro, UMR Eco&Sols, IRD, Inst Rech & Dev, F-34060 Montpellier 2, France

来源：

SOIL USE AND MANAGEMENT | 2011年 / 27卷 / 03期

关键词：

Black carbon; calcareous soils; CTO methods; decarbonation; thermal oxidation; artefact; POLYCYCLIC AROMATIC-HYDROCARBONS; ORGANIC-CARBON; ELEMENTAL CARBON; SEDIMENTS; QUANTIFICATION; RADIOCARBON; MARKERS; MATTER; SHELF; SOOT;

D O I：

10.1111/j.1475-2743.2011.00349.x

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

We studied the black carbon (BC) content of ca. 405 samples from French topsoil and artificial soil and carbonate mixtures. Our protocol involved three main steps: (i) decarbonation by HCl, (ii) elimination of non-pyrogenic organic carbon in a furnace at 375 degrees C, and (iii) quantification of residual carbon by CHN analysis. BC content increased for calcareous soils according to their carbonates content. Subsequent analyses confirmed the existence of a methodological artefact for BC determination only in calcareous soils. Decarbonation changes the thermal properties of organic matter, creating more recalcitrant carbon than in the initial sample. Higher CaCO(3) and organic carbon content results in a more pronounced artefact. The reversal of the first two steps of the chemo-thermal oxidation method (i. e. thermal oxidation before soil decarbonation) eliminates this artefact. Overall, our results suggest that BC content may have been overestimated in a large number of studies on calcareous soils.

引用

页码：333 / 339

页数：7

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