McHugh Thomas E.,Molofsky Lisa J.,Adamson David T.,Newell Charles J.
申请号：
US201615157013
公开号：
US9938682(B2)
申请日:
2016.05.17
申请国别(地区):
美国
年份:
2018
代理人:
Blank Rome LLP
摘要：
A system, device, and method quantitatively measure average concentrations of target constituents (e.g., volatile organic compounds (VOCs)) in an ambient fluid (e.g., groundwater, surface water, air, etc.) over an extended period of time. The system uses a passive device having an outer equilibration chamber and an inner kinetic sampler. The device is placed in an ambient fluid for a specified period of time, wherein the target constituent(s) rapidly diffuse through a high-permeability membrane into the fluid-filled equilibration chamber. From there, the target constituents are taken up by an uptake rate the kinetic sampler that is configured to be less than an equilibration rate of the equilibration chamber.
