Our next webinar is scheduled for Thursday, October 18, 2018 12:00 PM – 1:00 PM EDT, featuring Dr. Upal Ghosh.
SiREM’s webinar series features guest speakers who are subject matter experts to provide the latest information on technology advances in environmental remediation and site characterization. The webinars will combine recent research and development activities for new and emerging contaminants and technologies with real word applications to characterize and remediate contaminated sites.
We hope you will join us for our next webinar:
New Advances in Passive Sampling and Linking with Bioaccumulation Models for Sediment Risk Assessment
While hydrophobic pollutants like polychlorinated biphenyls (PCBs) bind strongly to sediments, the process of uptake in aquatic organisms is controlled by an aqueous pathway. Research over the past two decades has demonstrated that the freely dissolved concentrations of hydrophobic chemicals are directly linked to sediment-dwelling organism’s exposure to contaminants as well as risk for biouptake into the larger foodweb. Measuring the freely dissolved concentrations of hydrophobic pollutants is challenging due to the very low concentrations and association with suspended particles. Recent advances in passive sampling have made it possible to accurately measure freely dissolved concentrations of hydrophobic pollutants in water. This presentation will provide an overview of the science behind passive sampling, new guidance documents that have been published recently, and new standard methods that are being developed. The criteria for selection of a passive sampling approach is discussed and include clear delineation of measurement goals, whether laboratory-based “ex situ” and/or field-based “in situ” application is desired, and ultimately which sampling method is best suited to fulfill the measurement objectives. Guidelines are provided for proper calibration and validation, including use of provisional values for polymer–water partition coefficients, determination of equilibrium status, and confirmation of nondepletive measurement conditions. Finally, results of the application of passive sampling in two case studies will be presented: 1) involving the prediction of bioaccumulation in fish before and after sediment remediation; and 2) assessment of ongoing inputs to a river and prediction of bioaccumulation and risk.
Upal Ghosh, PhD, Professor, department of Chemical, Biochemical, and Environmental Engineering at the University of Maryland Baltimore County. Dr. Upal holds an undergraduate degree in Chemical Engineering, and MS and Ph.D. degrees in Environmental Engineering. Dr. Upal’s group performs research in environmental engineering and science with a focus on the fate, effects and remediation of toxic pollutants in the environment. They use multidisciplinary tools to investigate exposure and bioavailability of pollutants and apply the new understanding to develop novel approaches for risk assessment and remediation. His research has contributed to the development and transition of novel sediment remediation technologies based on altering sediment geochemistry and controlling pollutant bioavailability. His work has been published in the leading journals in the field and the technology development has led to several US patents. Dr. Ghosh also is a co-founder of two startup companies that are transitioning emerging sediment remediation technologies to the field.
Jeff Roberts, received his M.Sc. Earth Sciences at the University of Waterloo. Jeff is a Senior Manager at SiREM with extensive technical experience in the laboratory assessment and field implementation of soil, sediment and groundwater remediation technologies at sites containing contaminants including chlorinated solvents, petroleum hydrocarbons and other recalcitrant compounds. Over the past fifteen years he has conducted and managed hundreds of bench-scale batch and column treatability studies, and also has technical experience in the growth, scale up and field implementation of several anaerobic microbial cultures for bioremediation remedies. Jeff has several years of passive sampling experience and was a lead member in the development and commercialization of the SP3TM sampler.