PS 26 Playground - Soil Analysis
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Transcript of PS 26 Playground - Soil Analysis
PS 26 Playground - Soil Analysis
Analytical Chemistry of PollutantsDr. Joe Gardella
Todd M. Alonzo, Dominic O. Hull, Doris J. Glykys, Ed Tasber, and David G. Twoey
Why Did We Choose PS26?Why Did We Choose PS26? Soil AnalysisSoil Analysis GC/MSGC/MS Elemental Analysis - Why Lead?Elemental Analysis - Why Lead?
• Requested by CommunityRequested by Community• Buffalo ChinaBuffalo China• Very Toxic MetalVery Toxic Metal
Sampling TechniqueSampling Technique Donned Gloves Donned Gloves
and Safety Glassesand Safety Glasses Spade Rinsed with Spade Rinsed with
50/50 v/v Nitric 50/50 v/v Nitric Acid/DI WaterAcid/DI Water
Dig Hole and Dig Hole and Obtain sample at Obtain sample at 6” Depth6” Depth
Refill HoleRefill Hole
JarsJars• Amber to Avoid Amber to Avoid
PhotolysisPhotolysis• No Head Space No Head Space
Above SampleAbove Sample• Sealed with FoilSealed with Foil• Cooled on Dry IceCooled on Dry Ice
Sampling Sites
Synthetic Organic Compounds
Lead
Harrison St. (Dead End)
Sampling Sites
Synthetic Organic Compounds
Lead
Harrison St. (Dead End)
Sampling Sites
Synthetic Organic Compounds
Lead
Harrison St. (Dead End)
Sampling Sites
Synthetic Organic Compounds
Lead
Harrison St. (Dead End)
Sampling Sites
Synthetic Organic Compounds
Lead
Harrison St. (Dead End)
Sampling Sites
Synthetic Organic Compounds
Lead
Harrison St. (Dead End)
Sampling Sites
Synthetic Organic Compounds
Lead
Harrison St. (Dead End)
Sampling Sites
Synthetic Organic Compounds
Lead
Harrison St. (Dead End)
Elemental AnalysisElemental Analysis DigestionDigestion Flame Atomic Absorption Flame Atomic Absorption
SpectroscopySpectroscopy Inductively Coupled Plasma / Inductively Coupled Plasma /
Atomic Emission Atomic Emission Spectroscopy Spectroscopy
Standard AdditionStandard Addition ResultsResults
DigestionDigestion EPA Method 3050 EPA Method 3050
• Successive Nitric Acid Additions and RefluxSuccessive Nitric Acid Additions and Reflux• Reduce VolumeReduce Volume• Peroxide NeutralizationPeroxide Neutralization• Reduce VolumeReduce Volume
– GFAA and ICP/MSGFAA and ICP/MS• Addition of HCl AcidAddition of HCl Acid
– FLAA and ICP/AESFLAA and ICP/AES
Direct Aspiration Atomic Direct Aspiration Atomic Absorption Spectroscopy Absorption Spectroscopy (FLAA)(FLAA)
A sample is aspirated and atomized in a flame.A sample is aspirated and atomized in a flame.
A characteristic light beam is directed through A characteristic light beam is directed through the flame into a monochromator, and onto a the flame into a monochromator, and onto a detector that measures the amount of detector that measures the amount of absorbed light.absorbed light.
Absorption depends upon the presence of free Absorption depends upon the presence of free unexcited ground-state atoms in the flame.unexcited ground-state atoms in the flame.
»Beer-Lambert LawBeer-Lambert Law
Standard AdditionStandard Addition The preparation of standards that match the The preparation of standards that match the
samples is often impossible or extremely difficult.samples is often impossible or extremely difficult.
Accurate determinations are possible by making Accurate determinations are possible by making the concentration calibration in the presence of the concentration calibration in the presence of the matrix.the matrix.
By adding aliquots of a standard to portions of the By adding aliquots of a standard to portions of the sample, any interferent present in the sample will sample, any interferent present in the sample will affect the standard and sample absorbance affect the standard and sample absorbance similarly.similarly.
If Interferences are If Interferences are present: present:
The number of ground state atoms producing The number of ground state atoms producing atomic absorption will be affected. atomic absorption will be affected.
The absorbance increase from the added standard The absorbance increase from the added standard will also change by the same proportional amount will also change by the same proportional amount since the concentration of interferent is the same since the concentration of interferent is the same in each solution.in each solution.
T
xxadd
T
xx
T
ss V
VbCbCVVbC
VVbCA
Determination of Determination of ConcentrationConcentration
T
xxadd VVbCbbmbmCA ;
x
Tx
T
xx
VV
mbC
VVbC
bbm
Comparison of Lead Comparison of Lead ResultsResults
0
400
E & E, Inc. Joe's Class
Synthetic Organic AnalysisSynthetic Organic Analysis DigestionDigestion Volume ReductionVolume Reduction GC-MS AnalysisGC-MS Analysis Qualitative AnalysisQualitative Analysis Quantitative AnalysisQuantitative Analysis
DigestionDigestion EPA Method 3550EPA Method 3550
– Addition of NaSOAddition of NaSO44
– Successive Addition of 50/50 v/v Successive Addition of 50/50 v/v Methylene Chloride/Acetone with Methylene Chloride/Acetone with Ultrasonic ExtractionUltrasonic Extraction
– Vacuum FiltrationVacuum Filtration– Reduce Volume Reduce Volume
GC-MS AnalysisGC-MS Analysis Separation of ComponentsSeparation of Components
– Using Capillary ColumnUsing Capillary Column– by Molecular Weightby Molecular Weight
Mass AnalysisMass Analysis– Fragmentation of CompoundsFragmentation of Compounds– Mass Separation by Mass-Charge RatioMass Separation by Mass-Charge Ratio
Qualitative ResultsQualitative Results AcenaphtheneAcenaphthene AnthraceneAnthracene Bis(2-ethylhexyl)Bis(2-ethylhexyl)
PhthalatePhthalate DibenzofuranDibenzofuran FlurantheneFluranthene FluoreneFluorene
2-Methyl-2-Methyl-NaphthaleneNaphthalene
NaphthaleneNaphthalene PyrenePyrene 4-Fluoro-1,1’-4-Fluoro-1,1’-
BiphenylBiphenyl 1,2-Dihydro-1,2-Dihydro-
AcenaphthyleneAcenaphthylene
Quantitative AnalysisQuantitative Analysis
Play Area
Basketball Court
Bleachers
Dead End
0.000.050.100.150.200.250.300.350.40
ppb
4-Fluoro-1,1'-Biphenyl Fluoranthene 1,2-Dihydro-Acenaphthylene
ConclusionsConclusions Lead and PAHs were detected in the Lead and PAHs were detected in the
soilsoil Concentration of lead in the park was Concentration of lead in the park was
below action levelbelow action level Concentration of lead at the dead Concentration of lead at the dead
end was above 400 ppm levelend was above 400 ppm level Many of the PAHs detected could Many of the PAHs detected could
not be quantifiednot be quantified