Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8852038 | Chemosphere | 2018 | 41 Pages |
Abstract
Pomacea canaliculata is a mollusk potentially useful as a biomonitor species of freshwater quality. This work explores the ability of snail tissues and symbiotic corpuscles to bioconcentrate and depurate mercury, arsenic, and uranium. Adult snails cultured in metal-free reconstituted water were exposed for eight weeks (bioaccumulation phase) to water with Hg (2â¯Î¼gLâ1), As (10â¯Î¼gLâ1), and U (30â¯Î¼gLâ1) and then returned to the reconstituted water for other additional eight weeks (depuration phase). Elemental concentrations in digestive gland, kidney, symbiotic corpuscles and particulate excreta were determined by neutron activation analysis. The glandular symbiotic occupancy was measured by morphometric analysis. After exposure, the kidney showed the highest concentration of Hg, while the digestive gland accumulated mainly As and U. The subcellular distribution in symbiotic corpuscles was â¼71%, â¼48%, and â¼11% for U, Hg, and As, respectively. Tissue depuration between weeks 8 and 16 was variable amongst elements. At week 16, the tissue depuration of U was the highest (digestive glandâ¯=â¯92%; kidneyâ¯=â¯80%), while it was lower for Hg (digestive glandâ¯=â¯51%; kidneyâ¯=â¯53%). At week 16, arsenic showed a differential pattern of tissue depuration (digestive glandâ¯=â¯23%; kidneyâ¯=â¯88%). The symbiotic detoxification of the three elements in excreta was fast between weeks 8 and 10 and it was slower after on. At the end of the depuration, each element distributed differentially in digestive gland and symbiotic corpuscles. Our findings show that symbiotic corpuscles, digestive gland and kidney P. canaliculata are sensitive places for biomonitoring of Hg, As and U.
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Authors
Alejandra D. Campoy-Diaz, MarÃa A. Arribére, Sergio Ribeiro Guevara, Israel A. Vega,