Geochemistry of Trace Metals from Chinese River/Estuary Systems: An Overview

1995 ◽  
Vol 41 (6) ◽  
pp. 631-658 ◽  
Author(s):  
Jing Zhang
Keyword(s):  
Trace Metals ◽  
River Estuary

The geochemistry of trace metals in the Brazos River estuary

1986 ◽  
Vol 22 (4) ◽  
pp. 459-477 ◽  
Author(s):  
Wendy L. Keeney-Kennicutt ◽  
B.J. Presley
Keyword(s):  
Trace Metals ◽  
River Estuary ◽  
Brazos River

scholarly journals Surface water characteristics and trace metals level of the Bonny/New Calabar River Estuary, Niger Delta, Nigeria

2015 ◽  
Vol 7 (2) ◽  
pp. 951-959 ◽  
Author(s):  
M. C. Onojake ◽  
F. D. Sikoki ◽  
O. Omokheyeke ◽  
R. U. Akpiri
Keyword(s):  
Surface Water ◽  
Trace Metals ◽  
Niger Delta ◽  
River Estuary ◽  
Water Characteristics

Trace metals and nutrients in lake sediments in the Province of Bali, Indonesia: a baseline assessment linking potential sources

2021 ◽  
Vol 72 (1) ◽  
pp. 66
Author(s):  
Irdhawati ◽  
Manuntun Manuruang ◽  
Amanda Reichelt-Brushett
Keyword(s):  
Trace Metals ◽  
Solid Waste ◽  
Lake Sediments ◽  
River Estuary ◽  
Agricultural Runoff ◽  
Small Scale ◽  
Protection Measures ◽  
Natural Beauty ◽  
Guideline Values ◽  
Contaminant Sources

Bali, Indonesia, receives over 6 million tourists annually, placing demand on resources and infrastructure that competes with expectations of natural beauty. Strongly linked to tourism are highly productive small-scale crafts industries and intensive small-scale agriculture and aquaculture production. Concentrations of nutrients, trace metals and metalloids were determined in soils from various land uses and solid-waste containment areas associated with small-scale industries, along with sediments from Lake Beratan, Lake Tamblingan, Lake Buyan, Lake Batur and the Badung River estuary. Soil associated with laboratory waste storage, and some sediments, exceeded guideline values for mercury or copper. Concentrations of other metals in soils and sediments were consistently below guidelines values, except zinc in solid waste collected from batik production (i.e. fabric-dyeing operations). Waste from batik production contained elevated concentrations of trace metals and nutrients (phosphorus and potassium), but replicates were highly variable. Lake sediments were enriched with phosphorus and nitrogen, likely from agricultural runoff. This important baseline information highlights the value of lake-protection measures in place, identifies risks to environmental health and provides focus for improving the management of contaminant sources to prevent further impacts.

Trace metals load on beached microplastics in the anthropogenically influenced estuarine environment - Croatian middle Adriatic

2021 ◽  
Author(s):  
Vlado Cuculić ◽  
Hana Fajković ◽  
Željko Kwokal ◽  
Renata Matekalo
Keyword(s):  
Trace Metals ◽  
Trace Metal ◽  
Specific Surface ◽  
Anodic Stripping Voltammetry ◽  
Sampling Site ◽  
River Estuary ◽  
Mesh Size ◽  
Stripping Voltammetry ◽  
Differential Pulse ◽  
Surface Seawater

<p>Marine plastic litter can be a significant vector for ecotoxic trace metals into coastal areas. Eventually, it can be burried in sediment and in accumulated material on the beach with organic and inorganic material on its surface. In order to analyze the trace metal quantities (Cd, Cu, Pb and Zn) on different size particles in an anthropogenically affected environment, microplastics were sampled from the accumulated material on the Mala Martinska natural beach (Šibenik Bay, Croatia) in September 2019. The city of Šibenik and the Šibenik Bay are located in the lower part of the Krka River estuary (middle Adriatic). It is the main Croatian port for the phosphate ore import. Also, it was found earlier that Šibenik Bay was polluted by the ex-ferromanganese industry located in it, and the industrial slag spreading around the factory was the significant supply of trace metals in the Bay. The concentrations of dissolved and total metals in the surface seawater at the same location and at the reference point (coastal surface seawater at Jadrija, ~4 km SE from the sampling site) were determined in February and June 2020.</p><p>The collected material was sieved through a metal sieve with a 4 mesh size, resulting in 4 bulk (mixed microplastics) aliquots (> 4mm; 4-2 mm; 2-1 mm; 1-0.250 mm). From each of of the 4 bulk aliquots, subsamples of mixed plastics and polystyrene (PS) particles were isolated, resulting in 8 subsamples in total. The type of plastic particles (> 4mm; 4-2 mm and PS) was determined by FTIR spectroscopy performed on Bruker Tensor 27 in the region from 4000-400 cm<sup>-1</sup>. Trace metal concentrations on such defined particles and in seawater samples were determined using differential pulse anodic stripping voltammetry (DPASV) by Metrohm Autolab modular potentiostat/galvanostat Autolab PGSTAT204, connected with a three-electrode system Metrohm 663 VA STAND (Utrecht, The Netherlands). Working electrode used was static mercury drop electrode (SMDE).</p><p>In general, the amounts of trace metals associated with the plastic particles (Cd 0.02-0.35 µg/g; Pb 1.1-34.1 µg/g; Cu 1.7-32.9 µg/g and Zn 6-147 µg/g) were in the range of unpolluted and moderately affected sediments in the Adriatic Sea. The mass fractions of all tested trace metals increase with decreasing plastic particle size, probably due to the larger specific surface areas on the smaller particles. That was not the case for the plastic particles larger than 4 mm, both in mixed and PS samples, where the amounts of metal were higher compared to particles of 4-2 mm and 2-1 mm. Furthermore, all metals except cadmium showed a higher affinity for PS in comparison with mixed plastic samples of the same particle sizes (up to order of magnitude higher metal amounts), due to the PS highly developed specific surface area. In order to better understand the mechanism of association of trace metals with microplastics under different environmental conditions, further investigations are needed.</p><p>This work has been fully supported by Croatian Science Foundation under the project lP-2019-04-5832.</p>

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