7th Needle/Leaf Interlaboratory Comparison Test 2004/2005

Wien

2005

30 S. + 65 S. Annex -Results

Monographie

3-901347-52-6

15015

120744

The results of the 7th Interlaboratory Comparison Test show generally a good analytical quality in foliar analysis. Some of the laboratories had to learn from their ringtest results, especially those with outliers type b, c and/or results outside of the tolerable limits. A few of the laboratories must change their methods (e.g. dry ashing!!!) or check their methods with standard reference materials, ring test samples or primary standards. Calibration Problems of element analysers appear to be corrected. Most of the labs (90 %) are using control charts a a daily routine procedure. A trend in the use of analytical methods can be seen: - For C, N,(S) element-analysers are becoming more and more important. - Acid digestion methods in closed systems in combination with ICP methods are very good for the determination of S, P, K, Ca, Mg, Fe, Zn, B, Cu, Pb and Cd. - Flameless-AAS and ICP-MS methods should be used for analysing Cd, Pb and Cu (especially for low concentrations), - X-ray fluorescence analyses is the method to generate good results for S, P, Ca, Mg, K, Zn and Mn.