Determination of oral uptake and biodistribution of platinum and chromium by the garden snail (Helix aspersa) employing nano-secondary ion mass-spectrometry

► Platinum and chromium were detected in midgut gland, mantle, and shell by Nano-SIMS. ► Highest concentrations of heavy metals in midgut gland > mantle > shell. ► Accumulation in midgut gland and mantle was in form of 2-5 μm large agglomerations. ► Platinum and chromium distribution in shell appeared rather diffuse.