Dr. Dustin McIntyre Profile

Dr. Dustin McIntyre

at National Energy Technology Lab

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Proceedings Article | 22 May 2015 Paper

Development of laser-induced breakdown spectroscopy sensor to assess groundwater quality impacts resulting from geologic carbon sequestration

Cantwell Carson, Christian Goueguel, Jinesh Jain, Dustin McIntyre

Proceedings Volume 9467, 94671K (2015) https://doi.org/10.1117/12.2175538

KEYWORDS: Laser induced breakdown spectroscopy, Carbon dioxide, Calcium, Lithium, Statistical analysis, Strontium, Calibration, Liquids, Q switched lasers, Pulsed laser operation

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The injection of CO₂ into deep aquifers can potentially affect the quality of groundwater supplies were leakage to occur from the injection formation or fluids. Therefore, the detection of CO₂ and/or entrained contaminants that migrate into shallow groundwater aquifers is important both to assess storage permanence and to evaluate impacts on water resources. Naturally occurring elements (i.e., Li, Sr) in conjunction with isotope ratios can be used to detect such leakage. We propose the use of laser induced breakdown spectroscopy (LIBS) as an analytical technique to detect a suite of elements in water samples. LIBS has real time monitoring capabilities and can be applied for elemental and isotopic analysis of solid, liquid, and gas samples. The flexibility of probe design and use of fiber optics make it a suitable technique for real time measurements in harsh conditions and in hard to reach places. The laboratory scale experiments to measure Li, K, Ca, and Sr composition of water samples indicate that the technique produces rapid and reliable data. Since CO₂ leakage from saline aquifers may accompany a brine solution, we studied the effect of sodium salts on the accuracy of LIBS analysis. This work specifically also details the fabrication and application of a miniature ruggedized remotely operated diode pumped solid state passively Q-switched laser system for use as the plasma excitation source for a real time LIBS analysis. This work also proposes the optical distribution of many laser spark sources across a wide area for widespread leak detection and basin monitoring.

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