National Water-Quality Assessment (NAWQA) Program
Paul D. Capel and Steve J. Larson, U.S. Geological Survey, Minneapolis, Minnesota.
Minimizing the loss of target chemicals from environmental water samples between the time of sample collection and isolation is important to the integrity of an investigation. During this sample holding time, there is a potential for analyte loss through volatilization from the water to the headspace, sorption to the walls and cap of the sample bottle, and transformation through biotic and/or abiotic reactions. This paper presents a chemodynamic- based, generalized approach to estimate the most probable loss process for individual target organic chemical. The basic premise is that the investigator must know which loss process(es) are important for a particular analyte, based on its chemodynamic properties, when choosing the appropriate method(s) to prevent loss.