Fig. 5
From: Barium bioaccumulation by bacterial biofilms and implications for Ba cycling and use of Ba proxies
SEM images and composition of natural barite from the ocean. a, b SEM micrographs showing examples of marine barite particles from the ocean water column (North Atlantic) in sinking particulate matter collected using a multiple-unit large-volume in situ filtration system. Scale bar represents 3 μm in a and 1 μm in b. c Representative spectrum showing the composition of barite particles. The spectrum corresponds to the particle indicated with the arrow in photograph a, and shows the P enrichment in natural marine barite
