Physicochemical speciation of trace elements in river water by means of ultrafiltration.

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概要

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• Ultrafiltration and Millipore filtration techniques have been used in the speciation of trace elements in Tama River water. The size distribution was clarified for 32 elements by means of neutron-activation analysis in order to discuss their chemical or physical forms. Alkali and alkaline-earth elements were primarily found in the dissolved-size fraction (<0.45 μm). Their dissolved species were mostly distributed in the smallest-molecular-weight fraction (<MW 500), although the alkaline-earth elements were also recognized to a significant extent (20–30%) in the middle-molecular-weight fraction (MW 10<SUP>4</SUP>–500). Transition elements were principally associated with the suspended-size fraction (>0.45 μm) in the upper reaches of the river, but in the lower reaches they were chiefly fractionated as the dissolved species, with the exception of Sc and Fe. The dissolved V and Mn were distributed in the smallest-molecular-weight fraction, while the Co, Ni, and Zn were divided between two smaller-molecular-weight fractions (MW 10<SUP>4</SUP>–500 and <MW 500). Light rare-earth elements were mostly associated with suspended materials. Heavier rare-earth elements were, on the contrary, mainly found in the dissolved-size fraction, while their dissolved species were concentrated in the middle-molecular-weight fraction. The dissolved species for As, Se, Sb, and W were divided into two smaller-molecular-weight fractions, although As, Se, and W were predominantly found in the middle-molecular-weight fraction and Sb was mainly detected in the smallest-molecular-weight fraction. Aluminium and Ag were mainly associated with suspended materials. Furthermore, the dissolved Al was mostly distributed in the smallest-molecular-weight fraction, while the Ag was concentrated in the largest-molecular-weight fraction (>MW 10<SUP>4</SUP>).

• 公益社団法人 日本化学会の論文

著者

• Yamazaki Masao

  Tokyo Institute Of Technology Research Laboratory Of Resources Utilization

• TANIZAKI Yoshiyuki

  Tokyo Metropolitan Isotope Research Center

• Nagatsuka Sumiko

  Tokyo Metropolitan Isotope Research Center

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• Physicochemical speciation of trace elements in river water by means of ultrafiltration.

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