An Analyst Performs a LC-HRMS Scan of an Extract of Post-Mortem

question 31

Multiple Choice

An analyst performs a LC-HRMS scan of an extract of post-mortem blood. The sample contains fentanyl, which is used to calculate the mass accuracy of the instrument. The exact mass is 336.2202 Da. The analysis produces a measured mass of 336.2189 Da. What is the mass accuracy in ppm?

• A) 3.9
• B) -3.9
• C) -2.6
• D) 2.6
• E) none of the above

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