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Cadmium isotope fractionation in the soil – cacao systems of Ecuador: a pilot field study

The often high Cd concentrations of cacao beans are a serious concern for producers in Latin America due to the implementation of stricter Cd limits for cocoa products by the European Union in 2019. This is the first investigation to employ coupled Cd isotope and concentration measurements to study...

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Autores principales: Barraza, Fiorella, Moore, Rebekah E. T., Rehkämper, Mark, Schreck, Eva, Lefeuvre, Grégoire, Kreissig, Katharina, Coles, Barry J., Maurice, Laurence
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9073709/
https://www.ncbi.nlm.nih.gov/pubmed/35528875
http://dx.doi.org/10.1039/c9ra05516a
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author Barraza, Fiorella
Moore, Rebekah E. T.
Rehkämper, Mark
Schreck, Eva
Lefeuvre, Grégoire
Kreissig, Katharina
Coles, Barry J.
Maurice, Laurence
author_facet Barraza, Fiorella
Moore, Rebekah E. T.
Rehkämper, Mark
Schreck, Eva
Lefeuvre, Grégoire
Kreissig, Katharina
Coles, Barry J.
Maurice, Laurence
author_sort Barraza, Fiorella
collection PubMed
description The often high Cd concentrations of cacao beans are a serious concern for producers in Latin America due to the implementation of stricter Cd limits for cocoa products by the European Union in 2019. This is the first investigation to employ coupled Cd isotope and concentration measurements to study soil – cacao systems. Analyses were carried out for 29 samples of soils, soil amendments and cacao tree organs from organic farms in Ecuador that harvest three distinct cacao cultivars. The majority of soils from 0–80 cm depth have very similar δ(114/110)Cd of about −0.1‰ to 0‰. Two 0–5 cm topsoils, however, have high Cd concentrations coupled with heavy Cd isotope compositions of δ(114/110)Cd ≈ 0.2%, possibly indicating Cd additions from the tree litter used as organic fertilizer. Whilst cacao leaves, pods and beans are ubiquitously enriched in Cd relative to soils there are distinct Cd isotope signatures. The leaves and pods are isotopically heavier than the soils, with similar Δ(114/110)Cd(leaf–soil) values of 0.22 ± 0.07‰ to 0.41 ± 0.09‰. In contrast, the data reveal differences in Δ(114/110)Cd(bean–leaf) that may be linked to distinct cacao cultivars. In detail, Δ(114/110)Cd(bean–leaf) values of −0.34‰ to −0.40‰ were obtained for Nacional cacao from two farms, whilst CCN-51 hybrid cacao from a third farm showed no fractionation within error (−0.08 ± 0.13‰). As such, further work to investigate whether Cd isotopes are indeed useful for tracing sources of Cd enrichments in soils and to inform genetic efforts to reduce the Cd burden of cocoa is indicated.
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spelling pubmed-90737092022-05-06 Cadmium isotope fractionation in the soil – cacao systems of Ecuador: a pilot field study Barraza, Fiorella Moore, Rebekah E. T. Rehkämper, Mark Schreck, Eva Lefeuvre, Grégoire Kreissig, Katharina Coles, Barry J. Maurice, Laurence RSC Adv Chemistry The often high Cd concentrations of cacao beans are a serious concern for producers in Latin America due to the implementation of stricter Cd limits for cocoa products by the European Union in 2019. This is the first investigation to employ coupled Cd isotope and concentration measurements to study soil – cacao systems. Analyses were carried out for 29 samples of soils, soil amendments and cacao tree organs from organic farms in Ecuador that harvest three distinct cacao cultivars. The majority of soils from 0–80 cm depth have very similar δ(114/110)Cd of about −0.1‰ to 0‰. Two 0–5 cm topsoils, however, have high Cd concentrations coupled with heavy Cd isotope compositions of δ(114/110)Cd ≈ 0.2%, possibly indicating Cd additions from the tree litter used as organic fertilizer. Whilst cacao leaves, pods and beans are ubiquitously enriched in Cd relative to soils there are distinct Cd isotope signatures. The leaves and pods are isotopically heavier than the soils, with similar Δ(114/110)Cd(leaf–soil) values of 0.22 ± 0.07‰ to 0.41 ± 0.09‰. In contrast, the data reveal differences in Δ(114/110)Cd(bean–leaf) that may be linked to distinct cacao cultivars. In detail, Δ(114/110)Cd(bean–leaf) values of −0.34‰ to −0.40‰ were obtained for Nacional cacao from two farms, whilst CCN-51 hybrid cacao from a third farm showed no fractionation within error (−0.08 ± 0.13‰). As such, further work to investigate whether Cd isotopes are indeed useful for tracing sources of Cd enrichments in soils and to inform genetic efforts to reduce the Cd burden of cocoa is indicated. The Royal Society of Chemistry 2019-10-23 /pmc/articles/PMC9073709/ /pubmed/35528875 http://dx.doi.org/10.1039/c9ra05516a Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/
spellingShingle Chemistry
Barraza, Fiorella
Moore, Rebekah E. T.
Rehkämper, Mark
Schreck, Eva
Lefeuvre, Grégoire
Kreissig, Katharina
Coles, Barry J.
Maurice, Laurence
Cadmium isotope fractionation in the soil – cacao systems of Ecuador: a pilot field study
title Cadmium isotope fractionation in the soil – cacao systems of Ecuador: a pilot field study
title_full Cadmium isotope fractionation in the soil – cacao systems of Ecuador: a pilot field study
title_fullStr Cadmium isotope fractionation in the soil – cacao systems of Ecuador: a pilot field study
title_full_unstemmed Cadmium isotope fractionation in the soil – cacao systems of Ecuador: a pilot field study
title_short Cadmium isotope fractionation in the soil – cacao systems of Ecuador: a pilot field study
title_sort cadmium isotope fractionation in the soil – cacao systems of ecuador: a pilot field study
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9073709/
https://www.ncbi.nlm.nih.gov/pubmed/35528875
http://dx.doi.org/10.1039/c9ra05516a
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