Optima3000-a907790a沉积物

仪器资料 · 发表于 2018-5-31 18:11:41

Optima3000-a907790a沉积物
The speciation of metals in a contaminated, anoxic, sul®de-rich, freshwater sediment was determined
experimentally, using a sequential extraction procedure based on the method of Tessier et al. Taking into
account the advantages and disadvantages of sequential extractions, the applied methodology allowed the
investigation of the inˉuence of aeration and acidi®cation on the distribution of various metals in the sediment.
Aeration caused Zn and Cd to be released from sul®des. Carbonates were partly dissolved by the oxidation
process, causing mobilisation of Ca. Fe became less mobile owing to a stronger binding to organic matter. The
speciation of K, Al, Ni, Pb and Mn and to a lesser extent of Cu was not affected by aeration. As a result of
acidi®cation of the aerated sediment, Ca, Mn, Ni, Zn and Cd became more mobile owing to the dissolution of
carbonates.

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