Complexation of neptunium(V) with Bacillus subtilis endospore surfaces and their exudates

摘要: Abstract The neptunyl ion is very toxic and has the potential to be highly mobile in environment. In an effort understand how its interactions with biological surfaces may affect movement environment, we investigated Bacillus subtilis endospores their exudates. exudates were dominated by dipicolinic acid. Spectrophotometric investigations of chemical form exudate solutions are consistent formation 1:1 neptunyl–dipicolinate complexes. Using neptunyl–endospore adsorption data spectrophotometric measurements complexes, determined thermodynamic stability constants for both species. Neptunyl onto endospore surface decreased increasing pH, which corresponds aqueous complexation dipicolinate. Adsorption was also ionic strength dependent as decreased. With this work, compared controls on partitioning a simulated system B . endospores, vegetative cells, generic natural organic matter. exerted greatest control systems.