How certain are you of your results? Is the variation in your data due to instrumentation measurement error or human error, or is the range representative of the variation within the sample itself? Useful references for dealing with uncertainty in laboratory methods in the geosciences are compiled here.
Carpi, A. and Egger, A.E. (2008) Uncertainty, Error, and Confidence. Visionlearning Vol. POS-1 (3). https://www.visionlearning.com/en/library/Process-of-Science/49/Uncertainty-Error-and-Confidence/157/reading
Bevington, P.R. and Robinson, D.K. (1992) Data Reduction and Error Analysis for the Physical Sciences, 2nd ed. The McGraw-Hill Companies, 328 p.
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Text written by Elizabeth Johnson, JMU