Kenji Fukuchi

Measurement and correlation of infinite dilution activity coefficients of bis(2,2,2-trifluoroethyl)ether in dodecane or alkanol

Abstract Infinite dilution activity coefficients of bis(2,2,2-trifluoroethyl)ether in dodecane or alkanol (1-octanol, 1-decanol or 1-dodecanol) were measured in the temperature region 10–40°C using the gas stripping method. The experimental results were correlated by the modified analytical solution of groups (ASOG) method previously proposed.

Measurement and correlation of infinite dilution activity coefficients of ethers in alkanols

Abstract The infinite dilution activity coefficients of ether (diethyl ether, methyl tertiary butyl ether, or diisopropyl ether) in alkane (octane, tetradecane, or hexadecane) were measured in the region of 10–40°C using the gas stripping method. The experimental results were correlated by a typical group-contribution model, ASOG.

Impacts of UV-A irradiation on laser-induced fluorescence spectra in UV-B damaged peanut (Arachis hypogaea L.) leaves.

Influence of ultraviolet A (UV-A) exerted on ultraviolet B (UV-B) damaged peanut leaves was examined by using the laserinduced fluorescence (LIF) method. The vitality index of the leaves was estimated from the measurement of the induction kinetics of chlorophyll fluorescence that was done in parallel with LIF spectra measurement. Visible ray irradiation of several hours to the UV-B damaged leaves recovered the vitality index of the leaves, while UV-A irradiation for the same period to the UV-B damaged leaves decreased the vitality index remarkably. No significant decrease of the vitality index was seen by the UV-A irradiation of several hours to the control (damage-less) leaves. It was understood that the UV-A irradiation to the UV-B damaged leaves causes the synergistic decrease of the vitality index. It is known that UV-absorbing pigments induced by UV-B irradiation are able to reduce not only UV penetration into the leaf but also photo-system II damage of the leaves. In this experiment, it is thought that the UV-absorbing pigments were decomposed by the UV-A irradiation and so further decreased in the vitality index of the leaves.

Measurement and prediction of adsorption equilibria of organic solutes from dilute aqueous solutions on activated carbon

Adsorption equilibria of a mixture of two solutes(pyridine+phenol), three solutes (acetone+pyridine+phenol, 1-butanol+pyridine+phenol) and four solutes(acetone+1-butanol+pyridine+phenol) from dilute aqueous solutions on activated carbon were measured at 25°C. The concentrations of solutes were up to 100 mmol·dm−3, while the initial concentrations of coexisting components were adjusted to 20 mmol·dm−3. The non-ideal adsorbed solution(NIAS) model proposed in a previous work was applied to predict the adsorption equilibrium data for the above multi-solute systems. The NIAS model is found to be useful for estimating the adsorption equilibria of the multi-solute systems using the physical properties of each pure components.

Measurement and Prediction of Adsorption Equilibria of Quaternary Organic Solutes from Dilute Aqueous Solutions on Activated Carbon

Adsorption equilibria of a mixture of two solutes(pyridine+phenol), three solutes (acetone+pyridine+phenol, 1-butanol+pyridine+phenol) and four solutes(acetone+1-butanol+pyridine+phenol) from dilute aqueous solutions on activated carbon were measured at 25°C. The concentrations of solutes were up to 100 mmol·dm−3, while the initial concentrations of coexisting components were adjusted to 20 mmol·dm−3. The non-ideal adsorbed solution(NIAS) model proposed in a previous work was applied to predict the adsorption equilibrium data for the above multi-solute systems. The NIAS model is found to be useful for estimating the adsorption equilibria of the multi-solute systems using the physical properties of each pure components.