Abstract
The interaction between a selected polyethylene container and solutes of aqueous solutions stored in the container was investigated. It was found that the solute disappearance from the solution follows either monoexponential or biexponential kinetics. It was shown that there is a rapid uptake stage followed by a slower (steady) disappearance phase during which the solute evaporates from the container to the atmosphere. The amount of solute in the container wall has been shown for the two principal solutes used in this work to remain constant until the concentration in solution drops to a predictable level. This constancy is attributed to the solubility of the solute in the plastic. The maximum amount of the solute dissolved in the container wall is related directly to the surface area of the container in contact with the solution. The effect of the polarity of a number of compounds on one of the characteristics of the interaction was investigated and a statistically significant correlation between the hexane—water partition coefficients of the compounds and their exponential disappearance rate constants was found.
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