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I'm working with chromatographic data for the measurement of a chemical that takes two separable forms in equal proportions (a racemic mixture). This produces two adjacent signals (peaks) which are nearly identical, notwithstanding some minor analytical measurement variation. I need to make a judgement call on whether the compound is "detected" or not across many hundreds of samples, so I'm looking specifically at the signal-to-noise ($s/n$) ratios of each peak (using the root-mean-square measurement of baseline noise). I'm using $s/n = 3$ as a threshold for detection (LOD), but some peak pairs close to the threshold of detection will have one peak with s/n barely above and the other barely below.

How can I most appropriately combine these two largely-redundant measurements? Can I average the two s/n measurements for one single easy-to-interpret value?

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  • $\begingroup$ Welcome to Chemistry! Take the tour to get familiar with this site. Mathematical expressions and equations can be formatted using LaTeX syntax. If you receive useful answers, consider accepting one. $\endgroup$ – pentavalentcarbon Jan 28 '17 at 15:23
  • $\begingroup$ Yes you can combine the two with the assumption that it is a racemic mixture. How you'd do this is a matter of speculation. I have no idea how you're processing the data. $\endgroup$ – MaxW Jan 28 '17 at 17:54