Comparison of purge and trap GC/MS and spectrophotometry for monitoring petroleum hydrocarbon degradation in oilfield produced waters |
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Authors: | Gilbert T Tellez N Nirmalakhandan |
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Institution: | a Gil Environmental Engineering and Research, Corp. (GEER), Grand Praire, TX 75052, United States b Department of Civil Engineering, New Mexico State University, Las Cruces, NM 88003, United States c Department of Chemistry and Environmental Science and Engineering, University of Texas at El Paso, El Paso, TX 79902, United States |
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Abstract: | Results of using a field spectrophotometer and its appropriate protocols as a surrogate method for an oilfield produced water treatment process is presented. Methylene chloride extractions of the produced water before and after treatment maintained a yellow color pigment that was directly proportional to the hydrocarbon concentration. From this, an absorption spectrum and standard curve were developed. A resultant linear plot of the standard curve indicated that there is an excellent correlation (r2=0.9847) between the varying concentrations and the associated absorbance values at a wavelength of 400 nm. Total n-alkane concentration comparisons between the laboratory GC/MS analysis and the spectrophotometry analysis generated data of similar accuracy and precision at concentrations ranging from 1 to 137 mg/l (alpha=0.05). Linear comparisons between GC/MS and spectrophotometric coefficients were near unity, with the constant being near zero, with a correlation coefficient (r2) of 0.99. Based on this study, spectrophotometry is a complimentary method to GC/MS for determining total n-alkane concentrations in oilfield produced water samples. |
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Keywords: | Purge and trap GC/MS Spectrophotometer Oilfield produced water Petroleum hydrocarbons |
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