Low level mercury uptake by plants from natural environments--mercury distribution in Solidago altissima L.-.

In order to elucidate the participation of plants in the biogeochemical cycling of mercury in natural environments, total mercury contents in leaves, stems and roots of tall goldenrod (Solidago altissima L.), Compositae, were determined. The mercury content in stems was considerably lower than that in leaves and roots.

A kinetic method for the determination of copper(II) by its catalytic effect on the oxidation of 3-methyl-2-benzothiazolinone hydrazone with hydrogen peroxide: a mechanistic study.

A catalytic spectrophotometric method for the determination of traces of copper(II) is proposed. 3-Methyl-2-benzothiazolinone hydrazone (MBTH) is oxidized by hydrogen peroxide to form a yellowish-brown compound. The reaction is accelerated by trace amounts of copper(II), and can be followed by measuring the increase in the absorbance at 390 nm.

The hydrochemistry of surface waters in andesitic volcanic area, Norikura volcano, central Japan.

Many hydrochemical studies have been reported on surface waters and a major contributor of the water chemistry is considered to be rock dissolution. However, the extent of rock dissolution effect on surface water chemistry has still not been fully understood. The purpose of this research is to clarify the effect to give better understanding on the nature of surface water chemistry.

Kinetic determination of total iodine in urine and foodstuffs using a mixed acid as a pretreatment agent.

An analytical method for the determination of total iodine at the ng level in urine, biological materials and foods was investigated. The organic substances were completely decomposed using a mixed solution of nitric, perchloric and sulfuric acids as pretreatment agents at ca. 230 degrees C.

Heavy-metal distribution in river waters and sediments around a "firefly village", Shikoku, Japan: application of multivariate analysis.

River water and sediment samples were collected at the same site in a vicinity of an abandoned mine, and the concentrations of major elements and heavy metals were determined. The chemical correlations were observed by principal component analysis (PCA), and the samples were classified by cluster analysis (CA) based on the PCA scores. The PCA results presented a macroscopic viewpoint of covariance structure, i.