Sources, Fluxes, and Biogeochemical Cycling of Silver in the Oceans - Reviews of Environmental Contamination and Toxicology - page 39

Fig. 8 Dissolved Ag:Si and O 2 profi les and correlations in the Pacifi c Ocean (Zhang et al. 2004 ;
Ranville and Flegal 2005 ; Kramer et al. 2011 )
deposition silver and its potential for biogenic remobilization in marine sediments is
complex, as evidenced in San Francisco Bay (Smith and Flegal 1993 ; Rivera-Duarte
and Flegal 1997 ).
That complexity is illustrated by studies of silver in marine sediments, which
indicate that multiple factors and dynamic processes are involved. Early work by
Koide et al. ( 1986 ) showed silver enrichment relative to its crustal abundance in
coastal anoxic sediments collected around the globe. Later, Borchers et al. ( 2005 )
concluded that the enrichment they observed in Namibian upwelling sediments
resulted from a biogenic pre-concentration prior to burial. Silver distributions in
sediment cores collected within and around the oxygen minimum zone (OMZ) off