Transport and Affinity of Substituted Benzenes in Soybean Stems

摘要

The sorption of non-ionized substituted benzenes in the xylem tissue of excised soybean stems was studied. A positive pressure perfusion technique was used to force solutions containing chemicals and tritiated water through 50-mm stem segments. The stem effluent was collected at timed intervals and analyzed for each chemical and tritium activity. A theoretical mass transport model was developed and the experimental data were analyzed to calculate the flux of water, chemical sorption, and first order rate constants. Sorption of hydrophobic chemicals in the xylem tissue appeared to be the dominant interaction responsible for impeding solute movement. Linear relationships between sorption and accumulation of the chemicals in the xylem tissue, and the chemical octanol/water partition coefficients were demonstrated. The mathematical derivation of the mass transport model is described. (Copyright (c) Oxford University Press 1987.)