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We synthesized a novel adsorbent to recover inorganic arsenic(III) from groundwater, and we investigated its adsorptivity. The adsorbent, which was made by soaking powder made from crushed fisheries waste (scallop shells) in an iron sulfate solution without heat or pressure, adsorbed 0.2 mg of arsenic(III) per gram of adsorbent. This high adsorptivity and the inexpensive, simple, and environmentally benign synthesis method indicate that this easy-to-handle adsorbent may be useful for preparing safe drinking water from groundwater contaminated with toxic arsenic(III).

A size exclusion chromatography system with UV absorption detection and simultaneous multielement detection by ICP-AES has been used to elucidate that humic acid forms some large molecules with molecular weight larger than 300000 in aqueous solution, when zinc is added in humic acid solution as the ionic form.

The concentrated large molecules in pond water were separated by size exclusion chromatography, where organic molecules and trace metals were on-line detected by UV absorption and ICP-AES, respectively. It was found that some metal ions combined with large molecular substances of molecular weight larger than 10000.

Polystyrene-bound 2,4,6-trimercapto-s-triazine was prepared from 2,4,6-trimercapto-s-triazine (TMT) and Merrifield resin in a single step. Treatment with polymer-bound TMT was highly effective for reducing the concentration of residual Pd(II) in aqueous and organic solutions.

Rare earth elements in geological standard rock sample JG-1 (granodiolite) issued from the Geological Survey of Japan have been determined by a combined system of liquid chromatography and inductively coupled plasma mass spectrometry.