Authors: Benjamin Pauget Frédéric Gimbert Mickael Coeurdassier Coline Druart Nadia Crini Annette de Vaufleury
Publish Date: 2015/11/10
Volume: 23, Issue: 4, Pages: 2987-2996
Abstract
To better understand the fate of metals in the environment numerous parameters must be studied such as the soil properties and the different sources of contamination for the organisms Among bioindicators of soil quality the garden snail Cantareus aspersus integrates multiple sources eg soil plant and routes eg digestive cutaneous of contamination However the contribution of each source on metal bioavailability and how soil properties influence these contributions have never been studied when considering the dynamic process of bioavailability Using accumulation kinetics this study showed that the main assimilation source of Cd was lettuce 68 whereas the main source of Pb was the soil 90 The plant contribution increased in response to a 2unit soil pH decrease Unexpectedly an increase in the soil contribution to metal assimilation accompanied an increase in the organic matter OM content of the soil For both metals no significant excretion and influence of source on excretion have been modelled either during exposure or depuration This study highlights how the contribution of different sources to metal bioavailability changes based on changes in soil parameters such as pH and OM and the complexity of the processes that modulate metal bioavailability
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