A study on vertical distribution of elements and their chemical states in Yatsu tideland sediments

Vertical distribution of thirty and more elements in the Yatsu tideland sediment by instrumental neutron activation analysis (INAA) and prompt γ-ray analysis (PGA) have been clarified. The distributions of elements were categorized into three groups according the tendency of each vertical distribution. Chemical states of iron in the sediments were investigated by Moessbauer spectroscopy. In the distribution of iron species, maximum pyrite distribution was found in the middle layer. Paramagnetic high-spin Fe2+ distributed complementarily to pyrite, suggesting that the Fe2+ was used for pyrite formation. (author)