Field demonstration of a multichannel fiber-optic laser-induced fluorescence system in a cone penetrometer vehicle

Hart, Sandra G.; Chen, Yumin; Kenny, Jonathan E.; Lien, Bob K.; Best, Thomas W.

doi:10.1002/(sici)1520-6521(199712)1:6<343::aid-fact4>3.0.co;2-r

Cited by 12 publications

(3 citation statements)

References 7 publications

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“…The employment of fluorescence techniques for in situ analysis of soil contaminations has received considerable attention only during the last decade. The combination of LIF instrumentation with geotechnical drilling equipment for real-time subsurface detection of oil pollutions, as pioneered by Lieberman et al (Lieberman 1990), and field demonstrations have recently been described in detail in technology reviews and a monograph (Hart 1997, Lieberman 1998, Balshaw-Biddle 2000. Importantly, LIF-based techniques find increasing regulatory acceptance and have been verified as field screening methods for petroleum products by the US Environmental Protection Agency (US-EPA).…”

Section: Introductionmentioning

confidence: 99%

Laser-Induced Fluorescence (LIF) Spectroscopy for the In Situ Analysis of Petroleum Product-Contaminated Soils

Schultze¹,

Lemke²,

Löhmannsröben³

2004

Laser in Environmental and Life Sciences

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Section: Introductionmentioning

confidence: 99%

Laser-Induced Fluorescence (LIF) Spectroscopy for the In Situ Analysis of Petroleum Product-Contaminated Soils

Schultze¹,

Lemke²,

Löhmannsröben³

2004

Laser in Environmental and Life Sciences

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“…HAFB staff have already modified the groundwater collection system based on the field data. These improvements have increased the VOC influent concentrations into the treatment plant from 0.5 ppm to 3 ppm; it is expected that VOC concentrations into the plant will continue to rise reaching levels as high as 8 ppm.…”

Section: Risk Analysis Study At Operable Unitmentioning

confidence: 99%

Laser‐induced fluorescence and fast gas chromatography/mass spectrometry with subsurface thermal extraction of organics: Field analytical technologies for expediting site characterization and cleanup

Robbat

Kenny

Smarason

et al. 1998

Remediation Journal

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Albert Robbat Jr. is the director of the Center for Field Analytical Studies and Technology (CFAST) at Tujts University. Jonathan E. Kenny is also a member of CFAST, and both are chemistry faculty atTujts University. Sigurdur Smarason and Jane Wu Pepper are Ph.D. graduate students at Tujts University and members of CFAST. Andrew 0. Wright was a post-doctoral research associate at Tujts and is currently employed by Delta F Corporation. This article describes new field-based technologies that support the Dynamic Workplan/Adaptive Sampling and Analysis Program employed to better characterize hazardous waste sites at lower cost. A laser-induced fluorescence (LIF) probe was designed and field-tested with a cone penetrometer (CP) f o r investigatingpetroleum contaminantspresent at underground tank farms. The LIF produced real-time quantitative data for naphthalene and semiquantitative results for total petroleum hydrocarbons and diesel range organics. Two different projects are described employing fast gas chromatography/mass spectromet y (GC/MS) in the field. A 70foot heated transfer line andprobe were used in combination with a cone penetrometer to themally extract (El subsurface soil-bound semivolatile organics. I n the second project, soil samples were collected by a Geoprobe" and brought to the surface for analysis. The direct measurement E C P data produced semiquantitative results while the more conventional means of collecting and analyzing samples produced risk analysis quality data in thefield. A new set of rnassspectromety algorithmsprovided the technology breakthrough for identifying and quantifying a wide range of Environmental-Protection-Agency-listed target compounds in thepresence of high levels of matrix (Petroleum) interferents under fast, 7 min/ sample, GC conditions. 0 1998 John Wiley G Sons, Inc.The U.S. Environmental Protection Agency estimates that the cost for hazardous waste site cleanups will exceed $300 billion over the next ten years,' while Russel and his coauthors have projected cleanup costs between $480 billion and $1 trillion through the year 2020.2 An example is Hanscom Air Force Base (HAFB), where more than $25 million has been spent on traditional hazardous waste site investigations and cleanup. These costs are typical of relatively large public-and private-sector cleanup projects. The following questions should be posed: Do inadequate site

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“…Remote sensing has become increasingly important with the advent of subsurface -ber-optic characterization techniques. 13 In addition, industrial process monitoring in high temperature/pressure vessels or reactors has driven the use of ber optics in those settings. 14,15 A potential drawback when using optical bers for analytical measurements is the possibility of variation in the incident excitation energy, which is the amount of radiation delivered to the sample.…”

Section: Introductionmentioning

confidence: 99%

Fiber-Optic Quantum Counter Probe for Incident Excitation Energy Correction in Fluorescence Measurements

Hart

Jones

2001

Appl Spectrosc

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Excitation-power correction of uorescence spectra is essential for meaningful interpretation of analytical data. In particular, uorescence m easurements obtained using optical bers require special consideration due to the possibility of variations in the light intensity delivered to the sample or the incident excitation energy. A quantum counting ber-optic probe has been developed to sim ultaneously and independently collect uorescence spectra of both analytes and a quantum counter. The probe consists of excitation and emission bers angled to maximize distal cone overlap and a third ber positioned at a greater angle to allow excitation of rhodamine B, which is af xed to its distal end with a polymer. The uorescence of the quantum counter af xed to the ber was linear with incident 266 nm excitation energy over the measured range 1.2 3 10 14 photons per exposure to 1.2 3 10 15 photons per exposure at 266 nm. The corrected uorescence signals were im mune to adverse condition experiments such as laser power reduction and launch berlaser beam misalignment, while the uncorrected signals suffered greatly. The concentration calibration generated using the beroptic quantum counter method showed an improvement in the correlation coef cient, r 2 5 0.950, compared with the calibration generated using uncorrected data, r 2 5 0.906. Different types of adverse conditions were tested including power attenuation, power increase, and ber launch misalignment; the prediction erro rs were between 287% and 366% for the uncorrected data compared with prediction errors between 29% and 15% when using the ber-optic quantum counter method.

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Field demonstration of a multichannel fiber-optic laser-induced fluorescence system in a cone penetrometer vehicle

Cited by 12 publications

References 7 publications

Laser-Induced Fluorescence (LIF) Spectroscopy for the In Situ Analysis of Petroleum Product-Contaminated Soils

Laser-Induced Fluorescence (LIF) Spectroscopy for the In Situ Analysis of Petroleum Product-Contaminated Soils

Laser‐induced fluorescence and fast gas chromatography/mass spectrometry with subsurface thermal extraction of organics: Field analytical technologies for expediting site characterization and cleanup

Fiber-Optic Quantum Counter Probe for Incident Excitation Energy Correction in Fluorescence Measurements

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