passive samplers: use in forensics€¦ · monitors of organic chemicals in the environment:...
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Passive Samplers: Use in Forensics
Detlef (Deib) Birkholz, MSc, PhD, P. Chem. Henri de Pennart, PhD, P. Biol., R.P. Bio
Watertech 2013: April 11, 2013
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Semi-Permeable Membrane Devices, SPMDs
SPMDs generally consist of a thin film of the neutral triglyceride triolein, sealed in a layflat, thin-walled tube of low density polyethylene (LDPE).
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SPMD - Specifications
Triolein is used in SPMDs for the following reasons: major storage lipid in most organisms; commercially available in high purity form; triolein-water partition coefficients and water
octanol partition coefficients (KOWs) are similar
triolein is a liquid down to -4oC.
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SPMDs – Specifications (cont’d)
Choice of non porous LDPE layflat tubing based on: stability in organic solvents (required for
dialysis and membrane cleaning) low diffusion rates of triolein relative to HOCs
(hydrophobic organic chemicals) in LDPE during both uptake and dialytic recovery processes
resistance to abrasion and puncturing
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SPMDs – Specifications (cont’d)
Source: Huckins et al. 2006
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SPMD: target compounds
Source: Huckins et al. 2006
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Field Deployment (shallow water body)
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PRCs (Performance Reference Compounds)
The addition of PRCs is recommended to determine the effects of SPMD membrane biofouling on the uptake of HOCs. The PRC method can also account for the effects of flow-turbulence and temperature differences.
PRCs include: acenaphthene-d10, anthracene-d10, chrysene-d12, fluoranthene-d10, fluorene-d10, pyrene-d10, phenanthrene-d10, dibenz(a,h)anthracene-d14, 2,2’-dichlorobiphenyl (PCB #4), 3,5-dichlorobiphenyl (PCB#14), 2,4,5-trichlorobiphenyl (PCB#29), and 2,2’,4,6-tetrachlorobiphenyl (PCB#50).
Dibenz(a,h) anthracene-d14 is a good PRC to measure PAH photolysis
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Quality Control
SPMD Fabrication blank – SPMDs without PRCs. The primary purpose is to account for background contribution due to interferences from SPMD components, and for contamination incurred during laboratory storage, processing and analytical procedures.
Reagent blanks – consist of portions of all solvents
(volumes identical to those used for SPMD samples) used during the processing, enrichment, and instrumental analysis of an SPMD sample. Provides information on background due to laboratory reagents and procedures.
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Quality Control (cont’d)
Field/Trip Blank SPMDs – taken to the field in sealed metal cans and opened to the atmosphere at each site during both deployment and retrieval of SPMDs from aquatic systems.
SPMD spikes – triolein spiked with analytes, PRCs and
surrogates.
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Laboratory Procedures
Source: Huckins et al. 2006
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Calculating Water Concentrations
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History of SPMD Use in Alberta
First employed for alkylated PAH determination by ALS Environmental shortly after they came on the market in the early 1990’s.
Canada Creosote site, Calgary, AB. Disconnect between water quality data (16 L, Bow River) and analysis of fish bile downstream of site for PAHs.
Water quality showed no 4-6 ring PAHs which were abundant in fish bile (Princess Island).
Used following Lake Wabamun derailment and spill Have been employed for many other spills by Matrix Solutions SPMDs often more cost effective than fish collection and analysis. Focus has been on analysis of hydrocarbons, primarily PAHs Have also been used to find sources of dioxins/furans and PCBs in Alberta Currently being deployed by Environment Canada and consultants for
monitoring surface water in oil sands area.
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Correlating Chemistry with Biological Response
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SPMDs: A Tool for Forensics?
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Petroleum Biomarkers
All present in crude oil Alkanes Isoprenoids Adamantanes Sesquiterpanes Terpanes/hopanes Regular steranes/diasteranes Triaromatic steranes Informative PAHs Some concentrated and/or eliminated during refining Excellent way of differentiating between petroleum products
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Petroleum Biomarkers
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Methods
Spider cage with SPMD placed in a 1-gallon stainless steel container
One litre of HPLC grade water added containing small amount of diesel fuel, or environmental samples containing hydrocarbons.
Placed in a shaking incubator at room temperature for 7-days. SPMD removed, surface cleaned, solvent washed (acetone
and IPA), dried and then dialyzed in hexane. Dialysates cleaned up using HRGPC followed by alumina/silica. Analyzed for petroleum biomarkers, including informative
PAHs using gas chromatography/mass spectrometry
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Alkanes
m/z 85 Diesel C10-C30
Hydraulic Fluid C11 to C31
Crude Oil C12-C31
River A C11-C34
River B C13-C33
SINTEF Reference Oil C9-C35
SINTEF Reference Oil C9-C35
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Adamantanes
m/z 149
Diesel
Hydraulic Fluid
Crude Oil
River A
River B
Reference Oil
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Sesquiterpanes
m/z 123 Diesel
Hydraulic Fluid
Crude Oil
River A
River B
Reference Oil
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Terpanes & Hopanes
m/z 191
Diesel
Hydraulic Fluid
Crude Oil
River A
River B
Reference Oil
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Regular Steranes
m/z 217
Diesel
Hydraulic Fluid
Crude Oil
River A
River B
Reference Oil
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Diasteranes
m/z 218
Diesel
Hydraulic Fluid
Crude Oil
River A
River B
Reference Oil
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Triaromatic Steranes m/z 231 Diesel
Hydraulic Fluid
Crude Oil
River A
River B
Reference Oil
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m/z 234
PAHs – C4-Phenanthrenes
Diesel
Hydraulic Fluid
Crude Oil
River A
River B
Reference Oil
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m/z 192
PAHs – Methyl-Phenanthrenes/Anthracenes
Diesel
Hydraulic Fluid
Crude Oil
River A
River B
Reference Oil
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m/z 216
PAHs – Fluoranthenes-Pyrenes-Benzofluorenes
Diesel
Hydraulic Fluid
Crude Oil
River A
River B
Reference Oil
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m/z 270
PAHs – C3-chrysenes
Diesel
Hydraulic Fluid
Crude Oil
River A
River B
Reference Oil
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PAHs - C2-phenanthrenes
m/z 206 Diesel
Hydraulic Fluid
Crude Oil
River A
River B
Reference Oil
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PAHs - C2-Dibenzothiophenes
m/z 212 Diesel
Hydraulic Fluid
Crude Oil
River A
River B
Reference Oil
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PAHs - C3-phenanthrenes
m/z 220 Diesel
Hydraulic Fluid
Crude Oil
River A
River B
Reference Oil
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PAHs- C3-Dibenzothiophenes
m/z 226 Diesel
Hydraulic Fluid
Crude Oil
River A
River B
Reference Oil
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Markers- summary Analyte Diesel Hydraul. Crude River A River B
Hydrocarbons C10 - C30 C11 – C31 C12 – C31 C11-C34 C13-C33
C max C14 – C16 C24 – C26 C16 – C18 C24-C28 C23-C29
Adamantanes Yes Yes No Yes Yes Sesquiterpanes Yes Yes Yes Yes Yes
Terpanes/hopanes Yes Yes Yes Yes Yes Regular steranes Yes Yes Yes Yes Yes
Diasteranes Yes Yes Yes Yes Yes Triaromatic steranes No Yes Yes No Yes C4-phenanthrenes Yes Yes Yes Yes Yes
C1-phenant./anthracenes Yes Yes Yes Yes Yes
C3-chrysenes No Yes Yes Yes Yes C2-phenanthrenes Yes Yes Yes Yes Yes
C2-dibenzothiophenes No Yes Yes Yes Yes C3-phenanthrenes Yes Yes Yes Yes Yes
C3-dibenzothiophenes No Yes Yes Yes Yes C1-fluorenes/pyrenes benzofluoranthenes
Yes Yes Yes Yes Yes
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Hydrocarbon Forensics 101
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PAHs
Terpanes, steranes
Triaromatic steranes
n-C17, n-C18, Pristane, Phytane
sesquiterpanes
SPMDs vs. Source
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SPMDs can differentiate between different petroleum products by comparing hydrocarbon and petroleum biomarker profiles
Do capture all the petroleum biomarkers Do capture PAHs which are important to determine human
and ecological risk Although analysis of PAHs in water have been used for
forensics (e.g. C3-Dbt/C3-Phe and C2-Dbt/C2-Phe, C3-Dbt/C3-Chry, etc.) these ratios are not useful when deploying SPMDs
This is not surprising because of varying KOWs for the PAHs Analysis for petroleum biomarkers is effective at discerning
sources.
Conclusions
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The river samples are clearly different and show elements of middle distillates and heavy petroleum products.
The predominance of even alkanes in River A suggest a synthetic product.
Cannot dismiss that we may be looking at a mixtures of petroleum products in both River A and River B.
Conclusions (cont’d)
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Recommendations SPMDs could be used to determine potential seepage from
tailings ponds by sampling: Pond Groundwater downstream of dykes Downstream watercourses
This could be used as a tool to limit liability when finding of PAHs
in the environment
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Monitors of Organic Chemicals in the Environment: Semipermeable Membrane Devices, Eds. J.N. Huckins, J.D. Petty and K. Booij, Springer, New York, 2006, 219+ pages
B. Vrana et al. (2001). Use of semipermeable membrane devices (SPMDs). Determination of bioavailable, organic, waterborne contaminants in the industrial region of Bitterfeld, Saxony-Anhalt, Germany. Environ. Sci. & Pollut. Res., 8: 27-34
D. Alvarez (2010). Guidelines for the use of semipermeable membrane device (SPMD) and the polar organic chemical integrative sampler (POCIS) in environmental monitoring studies. http://pubs.usgs.gov/tm/tm1d4/pdf/tm1d4.pdf
References