Temporal and spatial distribution of trace metals in the Rufiji delta mangrove, Tanzania

Spatial and temporal distribution of trace metals and their cycling is a key issue for understanding the ongoing biogeochemical processes in coastal environments. Sediment cores were collected from six different sampling locations from the Rufiji delta mangrove forests in southeastern coastal Tanzan...

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Bibliographic Details
Published in:	Environmental monitoring and assessment Vol. 190; no. 6; pp. 336 - 19
Main Authors:	Minu, Andrew, Routh, Joyanto, Dario, Mårten, Bilosnic, Mario, Kalén, Rikard, Val Klump, J., Machiwa, John F.
Format:	Journal Article
Language:	English
Published:	Cham Springer International Publishing 01-06-2018 Springer Nature B.V
Subjects:	Accumulation Atmospheric Protection/Air Quality Control/Air Pollution Biogeochemistry Biota Cadmium Catchment area Chromium Chronology Coastal environments Coastal processes Copper Cores Earth and Environmental Science Ecology Ecotoxicology Environment Environmental Management Environmental monitoring Environmental science Fluvial sediments Lead Mangrove swamps Mangroves Metals Methods Monitoring/Environmental Analysis Nickel Plants (botany) Pollution Rivers Sampling Sediment Sediments Spatial distribution Temporal distribution Trace metals Uptake Urban agriculture Urban development Urbanization Weathering Zinc Tanzania Sequential extraction Enrichment factor Sediments Geoaccumulation Trace metals Tracemetals
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Summary:	Spatial and temporal distribution of trace metals and their cycling is a key issue for understanding the ongoing biogeochemical processes in coastal environments. Sediment cores were collected from six different sampling locations from the Rufiji delta mangrove forests in southeastern coastal Tanzania that are perceived to be impacted by urban development and agricultural activities in the catchment, and pollution in upstream sections of the Rufiji River. The chronology and sediment accumulation rates at these sampling sites were derived based on the distribution of 210 Pb excess method. The trace metals (As, Cd, Cr, Cu, Ni, Pb, and Zn) were sequentially extracted as per the BCR method and analyzed. The results indicate that the mass accumulation rates range from 0.40 g cm −2 year −1 (cores NR3 and NR4) to 1.75 g cm −2 year −1 (core SR1). Trace metals in the cores are mainly associated with the residual phase and their abundances in sediments are ranked as Cr > Zn > Ni > Cu > Pb > Cd. The results imply that trace metals in the Rufiji delta mangroves are mainly of crustal origin, and they are less sensitive to weathering. Further, these metals are least available for uptake by plants and they pose limited threat to the biota.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0167-6369 1573-2959 1573-2959
DOI:	10.1007/s10661-018-6707-2