Exploring canine olfactory generalization using odor profile fractions from native crude oils.

Area of Science:

• Environmental Science
• Analytical Chemistry
• Animal Behavior

Background:

• Canines possess exceptional olfactory capabilities valuable for industrial and governmental applications.
• Recent advancements include using canines for on-shore crude oil detection, enhancing oil spill response surveys with high accuracy and low risk.
• Understanding canine olfactory cues in crude oil detection is crucial for effective training and assessing odorant profile changes during degradation.

Purpose of the Study:

• To identify specific odorants or odorant groups utilized by canines in detecting subsurface crude oil.
• To analyze how crude oil's odorant profile changes with degradation.
• To assess canine performance across different crude oil odor fractions and weathering stages.

Main Methods:

• Headspace solid phase microextraction (HS-SPME) was employed to extract odorants from crude oil headspace.
• Gas chromatography-mass spectrometry (GC-MS) was used to separate and analyze the extracted odorants.
• Collected eluent fractions served as probes for canine olfactory trials, alongside control samples.

Main Results:

• Canine detection probes were created from separated crude oil odor profile fractions.
• Three trained canines were tested with fresh and weathered crude oil fractions.
• A 100% response rate was observed across all tested fractions for both fresh and weathered samples.

Conclusions:

• Canines demonstrate a remarkable ability to detect crude oil across all analyzed odor fractions.
• This indicates canines can generalize their detection skills across diverse crude oils and weathering states.
• The findings support the use of canines as reliable tools in crude oil detection and spill response efforts.