Effects of pH on Fluxes of Cadmium in Soils Measured by using Diffusive Gradients in Thin Films

Rachou, Julien; Hendershot, William H.; Sauvé, Sébastien

doi:10.1081/lcss-200030438

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Rhizosphere alkalisation — a major driver of copper bioavailability over a broad pH range in an acidic, copper-contaminated soil

et al. 2008

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The impact of a large rhizosphere alkalisation on copper (Cu) bioavailability to durum wheat (Triticum turgidum durum L.) initially exposed to a broad range of bulk soil pH (4.8-7.5) was studied. Plants were exposed to a Cu-contaminated soil treated with eight levels of lime (Ca(OH) 2 ) and supplied with NO 3 − or NH 4 + -NO 3 − . Nitrate-fed plants strongly increased their rhizosphere pH to about 6.9-7.6, whatever the initial pH. NH 4 + -NO 3 − -fed plants slightly acidified their rhizosphere down to 3.9. Free Cu 2+ concentration in the rhizosphere was 3 orders of magnitude larger for NH 4 + -NO 3 − than NO 3 − fed plants. Consequently, Cu bioavailability was 2.4-to 4.2-fold larger for NH 4 + −NO 3 − -fed plants which demonstrates the importance of rhizosphere alkalisation to restrict metal bioavailability in acidic soils. Copper bioavailability of NO 3 − -fed plants initially exposed to a broad range of bulk soil pH was insensitive to bulk soil pH, as rhizosphere pH was ultimately neutral in any case.

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