Container Transpiration

Overview

A problem that has gone relatively unnoticed when achieving reliable measurements is that of transpiration. Transpiration is defined as the passage of vapor from within a container to the outside. This loss of vapor can occur through the container walls or between the cap and threads, resulting in an increase in concentration. Transpiration becomes a problem when samples are stored for a long period of time. It is a greater problem for standard solutions, since they typically remain in use or storage for periods of up to one year.

Inorganic Ventures has been studying the transpiration loss of containers for several years. The data presented in this section will be for LDPE. This is one of the best container materials because it's the cleanest of the plastics and it's inexpensive. It has been gaining considerable popularity for use in the handling of both samples and aqueous standards.

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