Sampling trace-level organic solutes with polymeric tubing. Part 2. Dynamic studies
Parker and Ranney present the results of laboratory tests focused on investigation the potential positive or negative biases associated with using polymetric tubing to collect groundwater samples. This paper, the second in a series, focuses on the effects under dynamic (i.e., pumping) conditions. They show that negative biases are a function of the plymer material, the hydrophobicity of the contaminant, and the contact time between the sample and the polymer tubing. They also note that potential positive biases can occur due to desorption or reverse-diffusion of contaminants from the tubing into subsequent groundwater samples and therefore recommend the use of dedicated sampling tubing.