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Characterization of Physically Fractionated Wollastonite-Amended Agricultural Soils

School of Engineering, University of Guelph, Guelph, ON N1G 2W1, Canada
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Author to whom correspondence should be addressed.
These co-first authors contributed equally to this work.
Minerals 2019, 9(10), 635; https://doi.org/10.3390/min9100635
Received: 6 August 2019 / Revised: 26 September 2019 / Accepted: 14 October 2019 / Published: 16 October 2019
(This article belongs to the Special Issue Soil Minerals)
Wollastonite is a natural silicate mineral that can be used as an agricultural soil amendment. Once in the soil, this mineral undergoes weathering and carbonation reactions, and, under certain soil and field crop conditions, our previous work has shown that this practice leads to accumulation of inorganic carbon (calcium carbonate). Mineral carbonation is the carbon sequestration approach with the greatest potential for sequestration capacity and permanency. Agricultural lands offer vast areas onto which such minerals can be applied, while benefiting crops. This work illustrates a technique to separate wollastonite-containing soils into different fractions. These fractions are characterized separately to determine organic and inorganic content, as well as to determine the chemical and mineral composition. The aim is to detect the fate of wollastonite in agricultural soils, and the fate of weathering/carbonation products in the soil. The soils used in the study were collected from soybean and potato farmlands in Southern Ontario, and from an experimental pilot plot. Soil fractionation was done using sieving, and soil fractions were analyzed by a calcimeter, X-ray diffraction, and loss-on-ignition. Acid digested samples were measured by Inductively Coupled Plasma Mass Spectrometry. Carbonates and wollastonite were enriched by fractionation. View Full-Text
Keywords: enhanced weathering; mineral carbonation; mineral soil amendment; soil inorganic carbon; climate change mitigation enhanced weathering; mineral carbonation; mineral soil amendment; soil inorganic carbon; climate change mitigation
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Dudhaiya, A.; Haque, F.; Fantucci, H.; Santos, R.M. Characterization of Physically Fractionated Wollastonite-Amended Agricultural Soils. Minerals 2019, 9, 635.

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