First, we appreciate the recognition by Oudijk of our efforts to revise and better constrain our understanding of the factors associated with the application of and limitations associated with the use of n-C17/Pr ratios to estimating the age of middle distillate releases in the environment. Our evaluations included statistical evaluations of the initial n-C17/Pr ratios of approximately 4500 crude oils throughout the world and 90–100 products refined from these crude oils (or blended crude oils). The article also assessed the impact of diverse climatic conditions that could impact the degradation rate of n-C17/Pr ratios...

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