tics by state-of-the-art solid phase extraction: mining ... - tics.pdf · tics by state-of-the-art...
TRANSCRIPT
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TICs by State-of-the-Art SolidPhase Extraction: Mining the
Preliminary Results
ByR. Lee Lippincott Ph.D.
Judith Louis Ph.D., Gail Carter, Julia Barringer, Jessica Hopple,Robert Stiles, Brian Buckley Ph.D.
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Field Study: Sites of Thirty-one WellsSampled
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All 593Public CommunitySupply Wells in theCoastal Plain, withVOC SusceptibilityScores
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The 16 pairs ofHigh/Low WellsSelected for Samplingin Year 2 of the Study
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The 16 High/LowPairs of WellsSelected forSampling
FinalSusceptibilityRank shown foreach well
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Public Community Water Supply Systems in the Coastal Plainwith both High and Low Final Susceptibility Ranks
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An example of 2 pairs of High/Low Wells
950 feet
875 feet
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NJDEP Source Water AssessmentProgram (SWAP)
Model Developed by NJDEP and USGS RelatingGroundwater Quality to Land Use Patterns
2337 Community Water Supply Wells in NewJersey
Wells Given a Score and Rating Based onSensitivity and Intensity of Use Factors
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Goals of Study
1. Evaluate Analytical Methods for the Optimizationof Compound Recovery
2. Gather Data on the Contamination of the WellsSampled by NJDEP so that SWAP Model can beValidated
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Previous Work
EPA 8270 and 525.2 Analyzes Water for Semi volatileOrganic Contaminants (SVOCs) by SPE-GC/ITMSMethod Detection Limits (MDLs) Lowered for PAHs,PCBs and Pesticides using Modified EPA 525.2 MethodField Tested Method on Water Treatment Plants in NewJerseyDetection of a Number of Unregulated Contaminants
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C-18
DVB
Solid Phase Materials
Discovery Polymer
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Analytical Instrumentation
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Solid Phase Microextraction (SPME)
J. Chromatography A, 1996, 733, 143-157
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FiberAgitationSalinityExtraction TimeExtraction TemperaturepHSampling Mode
Parameters to Optimize for SPME
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Optimized SPME DirectExtraction Conditions
Fiber – 70μm CW/DVBSalinity – 10% NaClExtraction Time – 50 MinutesExtraction Temp – 45°CpH - Neutral
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3 Fibers - 3 Methods
100μm PDMSpolydimethylsiloxane
70μm CW/DVBCarbowax-divinylbenzene
85μm PApolyacrylate
Phthalates
General SVOCs
Phenols
MethodsFibers
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Absorption Vs. AdsorptionAdsorption: Surface Phenomena
Absorption: Diffusion PhenomenaSPME FiberSPME Fiber
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Criteria for Selectingan Extraction
Method (SPE vs.SPME)
Cost/Time of Analysis
Background ContaminantsSample ConsumptionMethod Detection LimitsField Test
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Background Contaminants:BreakingMethods into Components
SolventsGlasswareSPE Column HousingsSPE Sorbent Materialand Frits
FiberSampling VialsWaterSalt
SPE SPME
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Most Frequently Detected SPMEArtifacts
Compound Source(s)1,9-Nonanediol Carbowax Phase of SPME FiberBis Substituted Compounds Epoxy Glue of SPME NeedleCyclodecanol SPME Vial or Crimp TopDibutyl Phthalate SPME Vial or Crimp TopIsopropyl Myristate SPME Vial or Crimp Top (Leached by Water)Isopropyl Palmitate SPME Vial or Crimp Top (Leached by Water(Z)-. 6,10-dimethyl-5,9-Undecadien-2-one SPME Vial or Crimp Top
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1 0 1 5 2 0 2 5 3 0 3 5 4 0m i n u t e s
0
5
1 0
1 5
2 0
M C o u n t s
0
5
1 0
1 5
2 0
M C o u n t s
R I C a l l w a t e r b l a n k . s m s
R I C a l l w a t e r b l a n k . s m s
SPE Water Blank
SPME Water Blank
Relative Intensity of Blanks
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Background Contaminants(Summary)
SPE – Artifacts are Mostly PlasticizersOriginating from Sorbent Material and Frits
SPME – Artifacts have a Wide Range of Sourcesand are Fiber Dependent
SPE has a Greater Number of Artifacts but inLower Concentrations
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Method Detection Limits: SPME vs.USGS
CW/DVB MDLs (ppb) USGS RLs (ppb)bis (2-ethylhexyl) adipate 1.0 2000.0carbaryl 10.0 60.0butylated hydroxy toluene 1.0 80.0bisphenol A 1.0 90.0N,N-diethyltoluamide 1.0 40.0dieldrin 0.1 80.0cis-chlordane 0.1 40.0lindane 0.1 50.0tetrachloroethylene n.d. 30.0diazinon 1.0 30.0chlorpyrifos 1.0 20.0triphenyl phosphate 1.0 100.0methyl parathion n.d. 60.01,4-dichlorobenzene 0.5 30.0acetophenone n.d. 150.0bis (2-ethylhexyl) phthalate 0.5 2500.0diethyl phthalate 0.5 250.04-methylphenol 0.5 40.0
Environmental Science and Technology, 2002, 36, 1202
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Compound Class Direct SPME SPEBrominated 35 1
Chlorinated 6 14
Phenols 14 12
Benzenes 11 3
PAHs 5 0
Phthalates 5 3
Alcohols 10 11
Ketones 17 8
Aldehydes 4 1
Number of Unique Analytes Detectedin Wells
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Future Directions
Field Sampling of Wells In the Coastal Plain
Development of SPME-LC/MS Method
Investigation of Fibers that can Extract Analyteswith Extremely High or Low Log Kow Values
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Data Mining ProcessEvaluate Blank Data for repetitive blankcontaminantsSort Blank Data and Sample Data setsCompare Levels of Method Blank Contaminationwith Sample ContaminantsEliminate Blank Constituents from SamplePreliminary Data
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Data Prioritization ProcessLook for recurring contaminants in the wells
Evaluate the quality of the Mass Spectrometry
Determine Structure and plausibility of existencein the water column
Determine if you are observing a weathered orhydrolyzed product of another contaminant
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O
Br
Br
Br
Br
Br
BrBr
Br
BrBr
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O
Br
Br2,6-dibromo-4-methoxytoluene
O Br
1-bromo-4-ethoxy-benzene
FRAGMENTS OF PBDE’s ?
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OR BROMINATED DBP’s ?
Br
2-bromo-m-xyleneBr
2-bromo-1,4-dimethyl Benzene
Br
2-bromo-1,3,5-trimethylbenzene
NH
N
Br
Br
Br3,4,5-tribromo-1H-Pyrazole
Br
Br
1,2-dibromo-1-methyl-cyclohexane
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U.S. Environmental Protection AgencyPolybrominated Diphenyl Ethers (PBDEs) Project Plan
March 2006