Title
Beyond cadmium accumulation: Distribution of other trace elements in soils and cacao beans in Ecuador
Date Issued
01 January 2021
Access level
open access
Resource Type
research article
Author(s)
Abstract
Since cacao beans accumulate Cd in high levels and restrictions have been imposed on safe levels of chocolate consumption, concern about whether or not cacao trees store other toxic elements seems to be inevitable. Following a previous study in Ecuador examining Cd content in five cacao varieties collected in pristine areas and in places impacted by oil activities, we present here the concentrations of 11 trace elements (TEs) (As, Ba, Co, Cu, Cr, Mo, Mn, Ni, Pb, V and Zn) in soils, cacao tissues (leaves, pod husks, beans) and cocoa liquor (CL). Several TEs showed concentrations in topsoils above the Ecuadorian limits, and may have a mixed natural and anthropogenic origin. Ba and Mo concentrations in cacao tissues are slightly higher than those reported in other surveys, but this was not the case for toxic elements (As and Pb). TE contents are lower in CL, than in beans, except for Pb and Co, but no risk was identified for human health. Compared with control areas, Enrichment Factors were below 2 in impacted areas, except for Ba. Transfer factors (from soils to cacao) indicated that cacao does not accumulate TEs. A positive correlation was found between Cd and Zn in topsoils and cacao tissues for the CCN-51 variety, and between Cd and Ni for the Nacional variety. Identifying patterns of TE distribution and potential interactions in order to explain plant internal mechanisms, which is also dependent on the cacao variety, is a difficult task and needs further research.
Volume
192
Language
English
OCDE Knowledge area
Conservación de la Biodiversidad
Subjects
Scopus EID
2-s2.0-85091674315
PubMed ID
Source
Environmental Research
ISSN of the container
00139351
Sponsor(s)
Funding text 1
The authors would like to thank the French National Agency of Research for the financial aid under the ANR-MONOIL Project N° ANR-13-SENV-0003-01 . We also want to express our gratitude to the local farmers who allowed us to collect samples of their cacao crops. Finally, we want to thank the National Program of Innovation for the Competitiveness and Productivity of Peru, Innovate Peru, for the PhD study grant N°139-Innóvate Perú-BDE-2014 of the first author.
Funding text 2
Research Project: ANR (Agence Nationale de la Recherche, France)-MONOIL Project N?ANR-13-SENV-0003-01.PhD grant: National Program of Innovation for the Competitiveness and Productivity of Peru, Innovate Peru, N?139-Inn?vate Per?-BDE-2014.The authors would like to thank the French National Agency of Research for the financial aid under the ANR-MONOIL Project N?ANR-13-SENV-0003-01. We also want to express our gratitude to the local farmers who allowed us to collect samples of their cacao crops. Finally, we want to thank the National Program of Innovation for the Competitiveness and Productivity of Peru, Innovate Peru, for the PhD study grant N?139-Inn?vate Per?-BDE-2014 of the first author.
Sources of information:
Directorio de Producción Científica
Scopus