Diffusion sampler

摘要

A diffusion sampler includes an elongated tubular support structure, a top end cap, a bottom end cap, a first coupling device, at least a first membrane and a reservoir mechanism. The support structure has an outer wall that defines an interior space therein. The outer wall defines a plurality of openings. A membrane is disposed around the outer wall at least in the area of the upper portion of the support structure and is configured to allow at least one first selected type of molecule to pass therethrough. A reservoir mechanism is coupled to a bottom portion of the support structure and is configured to define a reservoir in the lower portion of the support structure that prevents a selected liquid from flowing out of the lower portion of the support structure.

主权项

1. A diffusion sampler, comprising:
(a) an elongated tubular support structure, having a top end and an opposite bottom end, and an outer wall that defines an interior space therein, the support structure including an upper portion and a lower portion, a plurality of openings defined by the outer wall of the support structure at least in an area of the upper portion; (b) a top end cap disposed at the top end of the support structure is configured to allow a liquid to be poured into the support structure; (c) a bottom end cap is disposed at the bottom end of the support structure and is configured to allow a liquid to be poured out of the support structure; (d) a first coupling device, affixed to a selected one of the top end of the support structure and the top end cap, that is configured to couple the diffusion sampler to a cable; (e) at least a first membrane disposed around the outer wall at least in the area of the upper portion of the support structure, the first membrane configured to allow at least one first selected type of molecule to pass therethrough; and (f) a reservoir mechanism, coupled to the bottom portion of the support structure, that is configured to define a reservoir in the lower portion of the support structure that prevents a selected liquid from flowing out of the lower portion of the support structure.