Metals geochemistry and mass export from the Mississippi-Atchafalaya River system to the Northern Gulf of Mexico

Investigating the Potential Impact of Louisiana Coastal Restoration on the Trace Metal Geochemistry of Constructed Marshlands

“…Our results are consistent with the studies of Trefry and co-workers who also found that trace metals like Fe, Mn, Pb, Zn, Cd, Cu, and Ni were primarily associated with environmentally labile fractions of LMR suspended sediments [36][37][38]91]. Furthermore, Reiman et al [101] showed that there is a significant correlation between total suspended solids and metal concentrations (i.e., Al, Ba, Fe, Mn, P, K, Si, Tl, and V) in the Mississippi River system, which also indicates that suspended sediments are an important reservoir and mechanism of metal transport in the river. These studies, along with our analyses, clearly demonstrate that substantial portions of the metal load within the Mississippi River are transported as environmentally labile fractions within the suspended sediments that are likely to be bioavailable if conditions change following deposition of these materials (see Tables 2 and 4).…”

Distribution, water quality, and health risk assessment of trace elements in three streams during the wet season, Guiyang, Southwest China

“…Most trace element concentrations in the study area are significantly higher than the average worldwide values, except Fe and Cd (in BY, JZ, and YY; Gaillardet et al, 2014). However, the concentrations of trace elements are lower than those reported for large river basins, such as the Yellow River (Gao et al, 2019), the Amazon River (Elbaz-Poulichet et al, 1999), the Changjiang River (Wang et al, 2011), and the Mississippi River (Reiman et al, 2018). In general, the dilution of the trace element contents is observed in the wet season (Liang et al, 2018).…”

“…And the downstream sampling point (YY-1) is a lake inlet, where a great number of contaminants are accumulated (Figure 1). Moreover, Fe concentrations in the YY are lower than that of the Pearl River (Ouyang et al, 2005), Changjiang (Wang et al, 2011), and the Mississippi River (Reiman et al, 2018) but higher than the other streams BY (24.35 mg/L), JZ (22.90 mg/L), and the Upper Han River (30.64 mg/L; Li and Zhang, 2010b). As previously noted, Youyu sampling sites have many abandoned coal mines, mainly concentrated upstream and less residential and commercial land (Yang et al, 2011;Zhang et al, 2019).…”

Holocene environmental history of a freshwater wetland in southern Louisiana: a sedimentary record of delta development, coastal evolution and human activity

“…garnet, calcite) and obscure provenance information (Presti & Michalopoulos, 2008; Mackey et al ., 2012), resulting in challenges in determining sediment provenance along the Gulf Coast. The geochemical data presented herein are not compromised by distant allochthonous sediments by the Mississippi River sediment (Reiman et al ., 2018), but are determined by the local swamp and marsh elements (Liu et al ., 2014; Ryu et al ., 2018) originating from adjacent wetlands. Elemental concentrations (e.g.…”

“…The Mississippi River introduced terrigenous heavy metals that formed freshwater wetlands around the southern Pontchartrain Bay (Stapor & Stone, 2004). Sand and silt associated with elevated terrestrial elements (Fe, Ti, Mn, K, Zr; Reiman et al, 2018) and a high Zr/Br ratio suggest extensive progradation of the St. Bernard delta adjacent to the Pontchartrain Bay. Because Zr is linked with coarse silt and fine sand associated with riverine influence (Alfonso et al, 2006), high concentrations of it and a high Zr/Br ratio Otvos (1978) and Stapor & Stone (2004).…”