Chevron U.s.a. Inc.

Marquette University

Rachel Ellen Mohler

Antonio J Ricco

Fabien J Josse

Florian Bender

Michael Moir

Ajit Ramachandra Pradhan

Thomas Hoelen

Toni Zhang Miao

Robert Michael Lorenz

Deyuan Kong

Ravindra Vasant Kolhatkar

Urmas Kelmser

Karen Synowiec

An exemplary embodiment of a method of detecting hydrocarbons in Systems and methods for sensing analytes in an aqueous solution, include pretreating a water sample to provide a test sample. A flow cell includes at least one sensor with a polymer coating having at least partial selectivity for at least one analyte. The flow cell receives a test sample and a reference sample. At least one output signal from the at least one sensor is processed with a microcontroller using a model of the sensor response and a bank of Kalman filters to estimate a concentration of at least one analyte in the aqueous solution.

Shear horizontal-surface acoustic wave system and method for measurement and speciaion speciation of hydrocarbons in groundwater

Disclosed is a method for generating a site specific model for predicting TPH concentration in soil. The method includes dividing a plurality of soil samples taken from a field site into two sets of samples. One set is analyzed using GC-FID, and the other set is analyzed using a handheld FTIR spectrometer with an ATR window to obtain FTIR-ATR absorbance data. Partial least squares regression analysis is used to correlate the GC-FID TPH concentration data with the absorbance data to generate a calibration model. The model is validated with soil samples having unknown TPH concentration. The model is used to predict the TPH concentration of soil samples taken from the field site analyzed using the handheld Fourier transform-infrared spectrometer to obtain FTIR-ATR absorbance data for the soil samples. During all absorbance measurements, each of the soil samples has a moisture content of 1 to 30 wt % and each sample is pressed against the ATR window with sufficient pressure to ensure intimate contact between the sample and the window.

Method for predicting total petroleum hydrocarbon concentration in soils

A process for a pre-concentration unit including: a sorbent material coated passage-way having an entrance for receiving a hydrocarbon-containing groundwater sample and for pre-concentrating the hydrocarbons in a hydrocarbon-containing groundwater sample by successive sorption/desorption cycles, and having an exit for discharging the pre-concentrated hydrocarbons; a heating unit for heating the sorbent material coated passage-way; and; an array of shear horizontal-surface acoustic wave sensors with coatings adapted for detecting and quantifying the pre-concentrated hydrocarbons, disposed at the exit of the sorbent material coated passage-way; and a housing for enclosing the pre-concentration unit and the array of shear horizontal-surface acoustic wave sensors, adapted for continuous use at a body of hydrocarbon-containing groundwater, and coupled to mathematical methods for generating concentrations of specific analytes from both transient and steady-state signals.

Detection of hydrocarbons in aqueous environments

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San Ramon, CA, United States of America

Rachel Ellen Mohler