Summary
Spruce needles were sampled from stations over 6 different bedrocks and analyzed for 24 elements by neutron activation. The results were then compared to conifer needle Standard Reference Materials (SRMs), NIST SRM 1575 pine needles and BCR CRM 101 spruce needles. Values for Al, As, Br, Cr, Fe, La, Na, Sb, Sc, and Th are 1 to 2 orders of magnitude higher in the SRMs than in the actual samples, whereas the other investigated elements do not show this effect. The most probable reason for the discrepancy is the inclusion of external material with the SRMs. Some properties of this external material and the consequences of its presence on the investigation of spruce needles are discussed.
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Wyttenbach, A., Bajo, S. & Tobler, L. Spruce needles: standards and real samples. Fresenius J Anal Chem 345, 294–297 (1993). https://doi.org/10.1007/BF00322614
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DOI: https://doi.org/10.1007/BF00322614