Passive Sampling of hydrophobic organic contaminants in the Great - - PowerPoint PPT Presentation

Passive Sampling of hydrophobic

• rganic contaminants in the

Great Lakes and around the world

Rainer Lohmann1, Carrie McDonough1, Zoe Ruge1, Mohammed Khairy1, Dave Adelman1, Ying Liu2, Paul Helm3, and Derek Muir4

1 Graduate School of Oceanography, University of Rhode Island, Narragansett, RI 02882, USA 2 Tonji University, Shanghai, China 3 Environmental Monitoring & Reporting Branch, Ontario Ministry of the Environment, 125 Resources Road, Toronto ON M9P 3V6 Canada 4 Aquatic Ecosystem Protection Research Division, Environment Canada, 867 Lakeshore Road, Burlington ON L7R4A6 Canada

Motivation for study

• Determine gradients of POPs/new compds

across Lakes Erie& Ontario

– On-going emissions? – Air-Water gradients – How much longer?

• Deployment of 60- 120 PE passive samplers

(50 mm thick, ca 2 g each) in 2011, 12, 13..

• Inclusion of citizen-scientists

PCBs across the inferior Lakes in 2011/12

• PCBs linked to

Urban centers / population density

(Liu et al., 2016a)

Air-water exchange fluxes

(Liu et al., 2016a)

Lake Ontario: Mass balance of dissolved PCBs

(Liu et al., 2016b)

Comparison with water quality guidelines

10 20 30 40 50 60

C V O S W G R I N I A B u f D u n C L E G I B F H S H F T O L E R I

• 1

E R I

• 4

E R I

• 5

E R I

• 6

E R I

Sampling location pg/L

PCBs H (FC)

New York water quality standards for the protection of human health from the consumption of fish (Khairy et al., 2015)

Old and ‘new’ PCBs

(Khairy et al., 2015)

Some conclusions

• Passive samplers

– enable high resolution air/water monitoring – asses sources and progress of remediation – pinpoint importance of riverine discharges – Derive net volatilization in most regions

• Indication of on-going releases of PCBs

– based on PCB profiles – in-water from AOCs/contaminated sites – mass balance considerations

Chasing other compounds, and their source regions

acehardware.com

Air Water

(McDonough et al., 2016b)

(McDonough et al., 2016b)

(McDonough et al., 2016b)

That musky flavor from the Lakes

Toronto Nearshore Lake Ontario Shoreline Lake Erie Shoreline

<DL X <DL X X

Average Gaseous PBDEs: 0.4 – 8.1 pg/m3

(McDonough et al., 2016a)

(McDonough et al., 2016a)

Aqueous flame retardants

• YES…

– gaseous BDE distributions driven by nearby population density – Absorption of gaseous BDEs a minor source of dissolved BDEs

• BUT…

– Niagara River a major source of dissolved PBDEs to Lake Ontario

Is population driving PBDEs?

Same plastic, different compounds and diverging fates

• Musks

– mostly water-borne – from effluents? – Net volatilization along shore sites

• PBDEs

– waterborne and net deposition – Rivers more important than atmosphere

• Passives

– detection of old and new POPs/ non-target? – High resolution trends and fluxes.

Soon: AQUA-GAPS

Lohmann et al., 2017

A network of networks anchored around Recetox

Thanks to..

• $ from
• Great Lakes Atmospheric Deposition (GLAD)

Program # 2010-5

• Great Lakes Restoration Initiative GLAS #

00E00597-0, Project Officer Todd Nettesheim

• Field deployments

– Volunteers, Paul Helm and Derek Muir for field deployments in lower Great Lakes

THANKS!