Evaluating cost when selecting performance reference compounds for the environmental deployment of polyethylene...

Area of Science:

• Environmental Chemistry
• Analytical Chemistry
• Ecotoxicology

Background:

• Environmental passive sampling requires equilibrium determination for accurate contaminant analysis.
• Performance reference compounds (PRCs) are crucial for estimating sampling rates and equilibrium.
• High costs of traditional PRCs (e.g., 13C-labeled PCBs) present a logistical challenge.

Purpose of the Study:

• To compare the efficacy of inexpensive deuterated PAHs versus expensive 13C-labeled PCBs as PRCs.
• To evaluate the impact of reduced PRC quantities on contaminant concentration estimations.
• To assess cost-saving potential in passive sampling methodologies.

Main Methods:

• Compared dissolved PCB concentrations using deuterated PAH and 13C-labeled PCB PRCs in freshwater and marine environments.
• Assessed the influence of varying PRC quantities on dissolved PAH and PCB concentration data.
• Analyzed individual congener and compound behavior versus total concentrations.

Main Results:

• Average differences in total dissolved PCB concentrations between PRC types were observed (34 pg/L in saltwater, 340 pg/L in freshwater).
• No statistical differences were found in total dissolved PAH and PCB concentrations across different PRC quantities.
• Individual PCB congeners and PAH compounds behaved comparably to total concentration metrics.

Conclusions:

• Inexpensive PRCs (deuterated PAHs) and smaller quantities can yield significant cost savings (approx. 75%) in passive sampling.
• This cost-effective approach is promising for marine water column monitoring and analysis of low/medium molecular weight congeners or total PCBs.
• Comparable results for PAHs and PCBs suggest broader applicability of reduced-cost PRC strategies.