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Carbonate precipitation in artificial soils as a sink for atmospheric carbon dioxide

Renforth, Philip, Manning, D. A. C. and Lopez-Capel, E. 2009. Carbonate precipitation in artificial soils as a sink for atmospheric carbon dioxide. Applied Geochemistry 24 (9) , pp. 1757-1764. 10.1016/j.apgeochem.2009.05.005

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Turnover of C in soils is the dominant flux in the global C cycle and is responsible for transporting 20 times the quantity of anthropogenic emissions each year. This paper investigates the potential for soils to be modified with Ca-rich materials (e.g. demolition waste or basic slag) to capture some of the transferred C as geologically stable CaCO3. To test this principal, artificial soil known to contain Ca-rich minerals (Ca silicates and portlandite) was analysed from two sites across NE England, UK. The results demonstrate an average C content of 30 ± 15.3 Kg C m−2 stored as CaCO3, which is three times the expected organic C content and that it has accumulated at a rate of 25 ± 12.8 t C ha−1 a−1 since 1996. Isotopic analysis of the carbonates gave values between −6.4‰ and −27.5‰ for δ13C and −3.92‰ and −20.89‰ for δ18O, respectively (against V-PDB), which suggests that a combination of carbonate formation mechanisms are operating including the hydroxylation of gaseous CO2 in solution, and the sequestration of degraded organic C with minor remobilisation/precipitation of lithogenic carbonates. This study implies that construction/development sites may be designed with a C capture function to sequester atmospheric C into the soil matrix with a maximum global potential of 290 Mt C a−1.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Publisher: Elsevier
ISSN: 0883-2927
Date of First Compliant Deposit: 30 March 2016
Last Modified: 01 Jul 2019 12:51

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