Community Research and Development Information Service - CORDIS

Abstract

Acid deposition is known to cause damage to forests. Chemical determination of various elements in leaves or needles can establish whether this is due to damage to foliage or to malnutrition. The Community Bureau of Reference has established for the purposes of quality control of such measurements two Certified Reference Materials: Beech leaves (CRM No.100) and Spruce needles (CRM No.101). The materials consist of hand-picked leaves and one year old needles from a moderately affected forest near Paderborn (FRG). After ballmilling under liquid N(2) to 125 micron particles, the powders have been homogenised for 2 weeks in a PTFE mixing drum. The homogeneity and stability studies showed that the materials were suitable for certification. Between 3 and 7 analytical methods have been applied to certify Al, Ca, Cl, K, Mg, Mn, N, P and Zn in CRM 101 and Cl, N, P and S in CRM 100. Utmost care was taken in calibration and pretreatment of the samples e.g. use of HF to digest the silicates was essential for the Al, Mg, Mn and K determinations. Indicative values on the content of 30 major or trace elements were also given.

Additional information

Authors: MAIER E, CEC, rue Montoyer 75, 1040 Bruxelles (BE);GRIEPINK B, CEC, rue Montoyer 75, 1040 Bruxelles (BE);MUNTAU H, JRC Ispra (IT)
Bibliographic Reference: Paper presented: 11th International Symposium on Microchemical Techniques, Wiesbaden (DE), Sept. 1, 1989
Availability: Text not available
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