Journal article
Quantification of deep soil carbon by a wet digestion technique
Soil Research, Vol.55(1), pp.78-85
2017
Abstract
Two wet digestion methods were evaluated using pure kaolinite as background for quantifying small concentrations of carbon (<0.05% total organic carbon (TOC)) in deep kaolinitic regolith in south-Western Australia. The limit of detection and limit of quantification of the Walkley-Black method (0.015 and 0.050% TOC respectively) were approximately five times lower than those of the Heanes method (0.085 and 0.281% TOC respectively). Both methods showed excellent linearity (R2>0.99) using prepared standards (lignin, humic acid, cellulose and chitin mixed with kaolinite and their combinations), in the concentration range 0.008-1.000% TOC. However, the percentage carbon recovery values were underestimated for chitin. The Walkley-Black method (TOCWB, %) was evaluated with 94 calibration and 27 validation deep soil samples (1-35m soil depth) and compared with a dry combustion (Elementar) technique (TOCactual, %). The predictive equation (TOCactual≤1.66TOCWB+0.018) (R2≤0.91) obtained from the calibration set agreed well with the benchmark dry combustion values (root mean square error≤0.017) and is recommended for quantification of deep soil carbon in other kaolinitic regoliths.
Details
- Title
- Quantification of deep soil carbon by a wet digestion technique
- Authors/Creators
- P. Sangmanee (Author/Creator)B. Dell (Author/Creator)R.J. Harper (Author/Creator)D.J. Henry (Author/Creator)
- Publication Details
- Soil Research, Vol.55(1), pp.78-85
- Publisher
- CSIRO
- Identifiers
- 991005545364607891
- Murdoch Affiliation
- School of Veterinary and Life Sciences
- Language
- English
- Resource Type
- Journal article
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Source: InCites
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- Citation topics
- 3 Agriculture, Environment & Ecology
- 3.45 Soil Science
- 3.45.112 Soil Carbon Dynamics
- Web Of Science research areas
- Soil Science
- ESI research areas
- Agricultural Sciences