Elevated concentrations of dissolved Ba, Fe and Mn in a mangrove subterranean estuary: Consequence of sea level rise?

Dissolved iron exports from an estuary surrounded by coastal wetlands: Can small estuaries be a significant source of Fe to the ocean?

“…Temperate peatlands and coastal wetlands have some common characteristics; i.e., they accumulate large quantities of organic carbon (Sanders et al, in press) and have elevated dissolved Fe concentrations that drain into surface water runoff (Krachler et al, 2010(Krachler et al, , 2012Sanders et al, 2012). One important difference for Fe geochemistry between these systems is the abundance of sulfates in coastal wetlands (Fitzpatrick et al, 2008;Johnston et al, 2009).…”

Spatial distribution and potential ecological risk assessment of some trace elements in sediments and grey mangrove (Avicennia marina) along the Arabian Gulf coast, Saudi Arabia

“…There are many studies that showed that the mangrove ecosystems can increase the suspension solid deposited by reducing the water dynamics and thereby releasing maximum time for fine-grained sediments, which are a main sink for trace elements [40]. Moreover, continuous remobilizing of trace elements ascended in water bodies as a result of the physical, chemical and biological operations in the sediments [41]. The pH values, which was in the majority of the studied sediment samples were alkaline, fluctuated between 7.49 and 8.51 at sites 6 and 13, respectively (average: 8.02±0.27).…”

Temporal variability in chemical cycling of the subterranean estuary and associated chemical loading to the coastal ocean

“…Mn fluxes associated with SGD are 1.6-2.9 x 106 mol y-1, much less than those reported from a site in Brazil (Sanders et al, 2012), due to the low Mn content of carbonate rock. We did attempt to measure iron in these samples, however our detection limit was 200 nmol kg-1 and all but a few of the reducing cenote samples were below this.…”