Field fluorometers as dispersed oil-in-water monitors

Lambert, Patrick; Goldthorp, Michael; Fieldhouse, Ben; Wang, Z; Fingas, Mervin F.; Pearson, Leslie; Collazzi, E.

doi:10.1016/s0304-3894(03)00202-4

Cited by 25 publications

(23 citation statements)

References 9 publications

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“…Published investigations have covered a diverse range of applications, including river water quality monitoring [11], industrial wastewater monitoring [12] and the measurement of oil in water [13]. A recent literature review identified the strong potential of fluorescence monitoring for sensitive online assessment of recycled water quality and treatment process performance [14].…”

Section: Introductionmentioning

confidence: 99%

Characterisation of reverse osmosis permeates from municipal recycled water systems using fluorescence spectroscopy: Implications for integrity monitoring

Singh

Henderson

Baker

et al. 2012

Journal of Membrane Science

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Section: Introductionmentioning

confidence: 99%

Characterisation of reverse osmosis permeates from municipal recycled water systems using fluorescence spectroscopy: Implications for integrity monitoring

Singh

Henderson

Baker

et al. 2012

Journal of Membrane Science

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“…27 Other groups used the same strategy but with separation of the different fractions of the petroleum to simplify the fluorescence spectra. 28 As expected, the aromatic compounds have the highest fluorescence intensity relative to the total oils and condensates.…”

Section: Articlementioning

confidence: 99%

Prediction of Crude Oil Properties and Chemical Composition by Means of Steady-State and Time-Resolved Fluorescence

et al. 2011

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Steady-state and time-resolved fluorescence measurements are reported for several crude oils and their saturates, aromatics, resins, and asphaltenes (SARA) fractions (saturates, aromatics and resins), isolated from maltene after pentane precipitation of the asphaltenes. There is a clear relationship between the American Petroleum Institute (API) grade of the crude oils and their fluorescence emission intensity and maxima. Dilution of the crude oil samples with cyclohexane results in a significant increase of emission intensity and a blue shift, which is a clear indication of the presence of energy-transfer processes between the emissive chromophores present in the crude oil. Both the fluorescence spectra and the mean fluorescence lifetimes of the three SARA fractions and their mixtures indicate that the aromatics and resins are the major contributors to the emission of crude oils. Total synchronous fluorescence scan (TSFS) spectral maps are preferable to steady-state fluorescence spectra for discriminating between the fractions, making TSFS maps a particularly interesting choice for the development of fluorescence-based methods for the characterization and classification of crude oils. More detailed studies, using a much wider range of excitation and emission wavelengths, are necessary to determine the utility of time-resolved fluorescence (TRF) data for this purpose. Preliminary models constructed using TSFS spectra from 21 crude oil samples show a very good correlation (R 2 > 0.88) between the calculated and measured values of API and the SARA fraction concentrations. The use of models based on a fast fluorescence measurement may thus be an alternative to tedious and time-consuming chemical analysis in refineries. ' INTRODUCTIONOnline remote characterization and real-time classification of crude petroleum are the most important current challenges faced by the petrochemical industry and environmental agencies. A rapid and inexpensive method for the remote analysis and classification of petroleum prior to distillation of the crude would provide chemical information of great importance for real-time adjustment of the critical operational parameters of a refinery, permitting an optimization of the process and resulting in economic and environmental benefits.A variety of spectroscopic techniques have been used over the last few decades for the analysis, characterization, and classification of crude oil in drilling fields, for the analysis of petroleum products, and for the detection of oil spills. The advantages of using such techniques include rapid response, the requirement of minimal sample preparation, and relatively inexpensive equipment costs. Of all of the optical spectroscopic techniques employed, vibrational [infrared (IR) and Raman] 1,2 and electronic [ultravioletÀvisible (UVÀvis) and fluorescence] spectroscopies have shown the highest potential in the field. Fluorescence is a more complex phenomenon than absorption (UVÀvis or IR), and effects such as quenching and energy transfer have to be considered. 3,...

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“…5 Since the instrument is calibrated using specic oils, the concentration yield which is represented by the uorescent signal is relative to those specic oils only. Disasters such as the deepwater horizon 1 (DWH) oil spill following an explosion in April, 2010 in the Gulf of Mexico remind us about the vulnerability of our ecosystem.…”

Section: Introductionmentioning

confidence: 99%

Continuous detection of trace level concentration of oil droplets in water using microfluidic AC electroosmosis (ACEO)

et al. 2015

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Detection of oil micro-droplets in water is important to environmental oil spill monitoring agencies. We present a microfluidic device for high-throughput trapping of oil droplets in water by using an AC electric field in a continuous flow. The electric field is applied through optically transparent indium tin oxide (ITO) electrodes fabricated on a glass substrate to enable direct visualization of the trapped oil droplets in water. The continuously flowing oil droplets in water are trapped by the opposing AC-driven electroosmotic (ACEO) flow due to the formation of electric double layers because of the deposition of polyelectrolytes. The deposition of these polyelectrolytes is necessary for the hydrophilization of the polydimethylsiloxane (PDMS) reactor. An array of SU8 micro-pillars was fabricated within the oil droplet entrapment zone to reduce the hydrodynamic drag force of the incoming fluids. The entrapment efficiency of oil droplets in water was studied as a function of the applied frequency of the electric field.We also observed the presence of a size-dependent negative dielectrophoretic (DEP) force as the droplets exit the entrapment zone. This can improve the entrapment efficiency for larger sized droplets as the strength of the DEP force would be higher.

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Field fluorometers as dispersed oil-in-water monitors

Cited by 25 publications

References 9 publications

Characterisation of reverse osmosis permeates from municipal recycled water systems using fluorescence spectroscopy: Implications for integrity monitoring

Characterisation of reverse osmosis permeates from municipal recycled water systems using fluorescence spectroscopy: Implications for integrity monitoring

Prediction of Crude Oil Properties and Chemical Composition by Means of Steady-State and Time-Resolved Fluorescence

Continuous detection of trace level concentration of oil droplets in water using microfluidic AC electroosmosis (ACEO)

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