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RESEARCH ARTICLE

Trace elements in road-deposited and waterbed sediments in Kogarah Bay, Sydney: enrichment, sources and fractionation

Thuy C. Nguyen A , Paripurnanda Loganathan A , Tien V. Nguyen A , Thi T. N. Pham A , Jaya Kandasamy A , Michael Wu B , Ravi Naidu C and Saravanamuthu Vigneswaran A D
+ Author Affiliations
- Author Affiliations

A Faculty of Engineering and Information Technology, University of Technology, Sydney, PO Box 123, Broadway, NSW 2007, Australia.

B National Measurement Institute, PO Box 138, North Ryde, NSW 1670, Australia.

C CERAR and CRC CARE, University of South Australia, Mawson Lakes, SA 5095, Australia.

D Corresponding author. Email: s.vigneswaran@uts.edu.au

Soil Research 53(4) 401-411 https://doi.org/10.1071/SR14163
Submitted: 27 June 2014  Accepted: 11 February 2015   Published: 22 May 2015

Abstract

Trace elements (TEs) in road-deposited sediments (RDS) can be transported by stormwater to neighbouring water bodies to cause aquatic pollution. A study was conducted in Kogarah Bay, Sydney, Australia, to assess the possible sources and potential mobility of TEs in RDS and the contribution to the TE load to the adjacent waterbed sediments in canals and the bay. Of the 11 TEs analysed, pseudo-total concentrations of zinc (Zn), copper (Cu), vanadium (V), chromium (Cr), and antimony (Sb) were greatly enriched in RDS over baseline soils (top 10 cm depth) collected in bushlands. All TE concentrations in waterbed sediments (top 10 cm depth) were similar to those in baseline soils but lower than in RDS. Correlation and principal component analyses revealed that Zn, Cu, Cr and Sb were related to each other in RDS, and probably originated from tyres and brake linings. Vanadium occurred in another component, likely to have originated mainly from road asphalt. Pseudo-total and mobile-fraction (0.1 m acetic acid, pH 2.85 extraction) TE concentrations in RDS were: iron > manganese, Zn > Cu, lead > Cr, nickel, V, Sb, cadmium. The potential ecological TE risk was low to medium in RDS but low in baseline soils and waterbed sediments.

Additional keywords: ecological risk, heavy metals, road-deposited sediments, water sediments, trace element fractionation.


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