Speciation of heavy metals on suspended sediment under high flow conditions in the River Aire, West Yorkshire, UK
✍ Scribed by E. J. Dawson; M. G. Macklin
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 398 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0885-6087
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✦ Synopsis
Concentrations of heavy metals (Cd, Cu, Pb and Zn) on suspended sediments during a ¯ood event at Thwaite Mills, River Aire, were analysed using a ®ve step sequential extraction technique to determine their major chemical associations (exchangeable, surface oxide and carbonate, Fe and Mn oxides, organic and residual metal ions). Total metal concentrations were lowest at higher discharges, resulting from dilution by clean sediment. The major transport fractions are the Fe and Mn oxides, which carry 29% of the total metals. Knowledge of the chemical forms of heavy metals on suspended sediment is essential for estimating their biological availability and physicochemical reactivity.