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Absorption spectra of sodium halides have been observed in the air-acetyrene flame. Those spectra show the meaningful absorptions with hyperfine structure in the ultraviolet reagion. The absorptions are due to photodissociation process of sodium halides in the flame, and the spectral parameters for the process have been estimated.

Cobalt(II and III) complexes including Vitamin B12have been investigated by X-ray photoelectron spectroscopy. Cobalt(II) and cobalt (III) complexes show the 2p1⁄2–2p3⁄2peak separation of 16.0±0.3 eV and 15.1±0.3 eV, respectively. The data of the binding energies for Co 2p1⁄2, Co 2p3⁄2, N ls and S 2p in cobalt complexes are also presented.

The polymerization of pyrrole adsorbed on a roughened gold electrode was studied by surface enhanced Raman scattering (SERS) spectroscopy. It was found that pyrrole was polymerized at −0.2 V vs. SCE and under open circuit. It is concluded that the polymerization of pyrrole occurs by the catalytic action of adatoms on a roughened gold electrode because pyrrole is adsorbed with the molecular ring parallel to the surface plane.

Mercury in the seawater collected from the Northwest Pacific Ocean was determined by a sensitive mercury analyzer set on the shipboard, where the mercury resonance line at 185.0 nm was used for atomic absorption measurement. The horizontal and vertical distributions of mercury will be reported in this communication.

Fundamental studies on the on-line HPLC detection of enzymatic activity of alkaline phosphatase (APase) has been examined, where 4-methylumbelliferyl phosphate was used as a substrate. The technique developed was applied to detection of APase in natural water.

The population density distributions of argon atoms in an inductively coupled plasma (ICP) are calculated based on the collisional-radiative model under a steady state approximation. The results obtained help to interpret the physical states of the argon plasma and to elucidate the characteristics of the ICP as an excitation source for spectrochemical analysis.

Surface compositions of suspended particles in estuarine and coastal waters were examined by X-ray photoelectron spectroscopy (XPS). It has been found that the surface compositions markedly changed, depending on the sampling locations in the estuarine and coastal areas.

Simultaneous multielement analysis of geological standard rock samples (JG-1 and JB-2) has been successfully performed by inductively coupled plasma mass spectrometry using a discrete microsampling technique. In this technique only 100 μl sample solution was used for simultaneous determination of 5–10 elements in solution.

A discrete microsampling technique using an electrothermal tungsten-boat vaporization device has been applied to atmospheric pressure helium microwave-induced plasma emission spectroemtry. The detection limits of 10-10–10-9g were obtained for Cd, Cu, Fe, Pb, Zn, and P, and the reproducibilities were in the range of 2.4–11.4%.

The elemental compositions of suspended particles collected in Tokyo Bay and Tamagawa River Estuary were determined by X-ray fluorescence spectrometry. It has been found that the concentrations of Al, Ti, and Fe in SP were decreased more rapidly than those of Si, Ca, K, Cu, and Zn from the estuarine to the bay areas.

Maskless local electrodeposition of polyaniline (PANi) on a gold electrode has been achieved by electropolymerization of aniline in a neutral electrolytic solution with an aid of laser irradiation. It was found that PANi can be deposited on the laser irradiated sites even at relatively lower anodic potential.

Rare earth elements in the standard rock samples such as GSJ JG-1, GSJ JB-1, and USGS AGV-1 have been determined simultaneously by inductively coupled plasma atomic emission spectrometry. It has been found that heavy rare earth elements in JG-1 provide lower values when it is dissolved by the acid digestion method.

The spectral line profiles of emission lines from hollow cathode lamps and an inductively coupled argon plasma have been measured by using a wavelength-modulation echelle monochromator. The data for the linewidths of Zn, Cd, Fe, Mg and Ca are provided along with a data correction method.

Mineral compositions of suspended particles (SPs) collected at coastal and estuarine areas in Tokyo Bay were investigated by X-ray diffraction spectrometry, where quartz, feldspar, illite, montmorillonite, kaolinite, and gibbsite were identified. The behaviors of such minerals in the estuarine area will be discussed.

Distinct negative correlation was found between the dissolved alkaline phosphatase activity and the orthophosphate concentration in Lake Kasumigaura (surface area, 171 km2) in the phosphorus-limited season. The decrease of the alkaline phosphatase activity induced by orthophosphate ions was observed at the level of 1 ng/mL of phosphorus, which is 3 orders of magnitude smaller than that in the laboratory scale experiment.

An inductively coupled plasma atomic emission spectrometer (ICP-AES) interfaced with high performance liquid chromatography (HPLC) has been applied to the determination of 15 rare earth elements (14 lanthanide elements and Y). The separation of rare earth elements was performed by HPLC with a cation exchange column using ammonium lactate buffer. The ICP-AES was used as a high-sensitive and an element-selective detector for rare earth elements.

For measuring the exact distribution of metal atoms in the flame, HITACHI 207 atomic absorption spectrophotometer was modified to a single light path with a smaller diameter of the light beam. Using this improved spectrophotometer, the more detailed distribution of cobalt atoms in the air-acetylene flame was measured in terms of some cobalt(III) complexes.

Molecular absorption spectrum of InCl was observed in the flame for the first time at the wavelengths near 2670 Å, when 0,2 M indium in 2 M HCl aqueous solution was aspirated into the air-acetylene flame. The absorption band of InO was, also, observed near 2730 Å in the same spectrum.

When a solution of indium dissolved in HClO4was aspirated into an air-acetylene flame, molecular absorption spectrum of InCl in the flame was observed by molecular flame absorption spectroscopy. This indicates that the recombination reaction between indium and chlorine occurs in the flame, following the thermal decomposition of HClO4.

The multielement determination of all rare earth elements in human blood serum by inductively coupled plasma mass spectrometry has been studied, where the blood serum sample was digested with nitric acid and perchloric acid, and then rare earth elements were preconcentrated by using the chelating resin prior to the determination. It was found that the concentrations of rare earth elements in human blood serum were at the ppt (10−12g/ml) level.

The elution behaviors of the mixture solution of strong electrolytes in electrostatic ion chromatography, using pure water as a mobile phase, have been investigated with a conductivity detector and ICP-AES, where a zwitterionic surfactant adsorbed on an ODS column was used as a stationary phase. The characteristic re-combinations of cations and anions as the ion-pairs were observed in the chromatograms.

Alkaline phosphatase activity dissolved in sea and lake water was determined, and alkaline phosphatase was identified as dissolved chemical species of trace metals (zinc) in natural water using high performance liquid chromatography (HPLC).