title: Rapid prediction of total petroleum hydrocarbons in soil using a hand-held mid-infrared field instrument.
abstract: This manuscript reports on the performance of a hand-held diffuse reflectance (mid)-infrared Fourier transform (DRIFT) spectrometer for the prediction of total petroleum hydrocarbons (TPH) in three different diesel-contaminated soils. These soils include: a carbonate dominated clay, a kaolinite dominated clay and a loam from Padova Italy, north Western Australia and southern Nigeria, respectively. Soils were analysed for TPH concentration using a standard laboratory methods and scanned in DRIFT mode with the hand-held spectrometer to determine TPH calibration models. Successful partial least square regression (PLSR) predictions, with coefficient of determination (R(2)) ~0.99 and root mean square error (RMSE) <200mg/kg, were obtained for the low range TPH concentrations of 0 to ~3,000mg/kg. These predictions were carried out using a set of independent samples for each soil type. Prediction models were also tested for the full concentration range (0-60,000mg/kg) for each soil type model with R(2) and RMSE values of ~0.99 and <1,255mg/kg, respectively. Furthermore, a number of intermediate concentration range models were also generated for each soil type with similar R(2) values of ~0.99 and RMSE values <800mg/kg. This study shows the capability of using a portable mid-infrared (MIR) DRIFT spectrometer for predicting TPH in a variety of soil types and the potential for being a rapid in-field screening method for TPH concentration levels at common regulatory thresholds. A novel hand-held mid-infrared instrument can accurately detect TPH across different soil types and concentrations, which paves the way for a variety of applications in the field.
authors: Ziltek Pty Ltd., PO Box 373, Kent Town, SA, 5071 Australia. Electronic address: Grant.Webster@ziltek.com.
authors: Grant T
authors: GT
authors: Webster
authors: CSIRO Land and Water, Environmental Contaminant Mitigation and Technologies, Waite Campus, Waite Road, Urrbrae, 5064 Australia; University of Adelaide, PMB 2, Glen Osmond, South Australia, 5064 Australia.
authors: José M
authors: JM
authors: Soriano-Disla
authors: Ziltek Pty Ltd., PO Box 373, Kent Town, SA, 5071 Australia.
authors: Joel
authors: J
authors: Kirk
authors: CSIRO Land and Water, Environmental Contaminant Mitigation and Technologies, Waite Campus, Waite Road, Urrbrae, 5064 Australia; University of Adelaide, PMB 2, Glen Osmond, South Australia, 5064 Australia.
authors: Leslie J
authors: LJ
authors: Janik
authors: CSIRO Land and Water, Environmental Contaminant Mitigation and Technologies, Waite Campus, Waite Road, Urrbrae, 5064 Australia.
authors: Sean T
authors: ST
authors: Forrester
authors: CSIRO Land and Water, Environmental Contaminant Mitigation and Technologies, Waite Campus, Waite Road, Urrbrae, 5064 Australia; University of Adelaide, PMB 2, Glen Osmond, South Australia, 5064 Australia.
authors: Mike J
authors: MJ
authors: McLaughlin
authors: Ziltek Pty Ltd., PO Box 373, Kent Town, SA, 5071 Australia.
authors: Richard J
authors: RJ
authors: Stewart
keywords: DRIFT, diffuse reflectance infrared Fourier transform; Hand-held MIR; TPH, total petroleum hydrocarbons