Quantitative produced water analysis using mobile 1H NMR

Lisabeth Wagner, Chris Kalli, Einar O. Fridjonsson, Eric F. May, Paul L. Stanwix, Brendan F. Graham, Matthew R J Carroll, Michael L. Johns

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    Measurement of oil contamination of produced water is required in the oil and gas industry to the (ppm) level prior to discharge in order to meet typical environmental legislative requirements. Here we present the use of compact, mobile 1H nuclear magnetic resonance (NMR) spectroscopy, in combination with solid phase extraction (SPE), to meet this metrology need. The NMR hardware employed featured a sufficiently homogeneous magnetic field, such that chemical shift differences could be used to unambiguously differentiate, and hence quantitatively detect, the required oil and solvent NMR signals. A solvent system consisting of 1% v/v chloroform in tetrachloroethylene was deployed, this provided a comparable 1H NMR signal intensity for the oil and the solvent (chloroform) and hence an internal reference 1H signal from the chloroform resulting in the measurement being effectively self-calibrating. The measurement process was applied to water contaminated with hexane or crude oil over the range 1-30 ppm. The results were validated against known solubility limits as well as infrared analysis and gas chromatography.

    Original languageEnglish
    Article number105501
    JournalMeasurement Science and Technology
    Volume27
    Issue number10
    DOIs
    Publication statusPublished - 31 Aug 2016

    Fingerprint

    Water analysis
    Nuclear Magnetic Resonance
    Chlorine compounds
    oils
    Nuclear magnetic resonance
    Water
    nuclear magnetic resonance
    chloroform
    water
    Gas industry
    Chemical shift
    Hexane
    Gas Chromatography
    Gas chromatography
    Nuclear magnetic resonance spectroscopy
    Solubility
    magnetic resonance spectroscopy
    chromatography
    calibrating
    gas chromatography

    Cite this

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    Quantitative produced water analysis using mobile 1H NMR. / Wagner, Lisabeth; Kalli, Chris; Fridjonsson, Einar O.; May, Eric F.; Stanwix, Paul L.; Graham, Brendan F.; Carroll, Matthew R J; Johns, Michael L.

    In: Measurement Science and Technology, Vol. 27, No. 10, 105501, 31.08.2016.

    Research output: Contribution to journalArticle

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    AU - Wagner, Lisabeth

    AU - Kalli, Chris

    AU - Fridjonsson, Einar O.

    AU - May, Eric F.

    AU - Stanwix, Paul L.

    AU - Graham, Brendan F.

    AU - Carroll, Matthew R J

    AU - Johns, Michael L.

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    AB - Measurement of oil contamination of produced water is required in the oil and gas industry to the (ppm) level prior to discharge in order to meet typical environmental legislative requirements. Here we present the use of compact, mobile 1H nuclear magnetic resonance (NMR) spectroscopy, in combination with solid phase extraction (SPE), to meet this metrology need. The NMR hardware employed featured a sufficiently homogeneous magnetic field, such that chemical shift differences could be used to unambiguously differentiate, and hence quantitatively detect, the required oil and solvent NMR signals. A solvent system consisting of 1% v/v chloroform in tetrachloroethylene was deployed, this provided a comparable 1H NMR signal intensity for the oil and the solvent (chloroform) and hence an internal reference 1H signal from the chloroform resulting in the measurement being effectively self-calibrating. The measurement process was applied to water contaminated with hexane or crude oil over the range 1-30 ppm. The results were validated against known solubility limits as well as infrared analysis and gas chromatography.

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