Abstract
The concentrations of thallium (Tl) in the surface sediments of the southwestern coastal Laizhou Bay and the rivers it connects were determined. In riverine sediments, the Tl concentrations ranged from 0.34 to 0.76μgg−1 in summer; in autumn, the corresponding data were 0.35–1.08μgg−1. In marine sediments, the Tl concentrations ranged from 0.36 to 0.58μgg−1 in summer; and from 0.30 to 0.56μgg−1 in autumn. The grain size, Al and Fe oxides were major factors affecting Tl distribution. Tl in the surface sediments of the studied area was mainly from the natural input with the non-natural input as a subsidiary source. The low concentrations of Tl made it hard to cause potential negative environmental effects in this area.
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