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15th Needle/Leaf Interlaboratory Comparison Test - 2012/2013
 11.01.13
61 laboratories in 28 countries participated in the 15th Needle/Leaf Interlaboratory Test. Four samples were submitted: Pine needles - Pinus sylvestris (Austria), Spruce needles - Picea abies (Austria), Blueberry leaves (Germany) and Litterfall/beech leaves - Fagus sylvatica (Austria).
In general are the results of the 15th Needle/Leaf Interlaboratory Test better than the test before. But a high percentage of non tolerable results could be found still for mandatory elements.  >>>
14th Needle/Leaf Interlaboratory Comparison Test - 2011/2012
 20.01.12
62 laboratories in 28 countries participated in the 14th Needle/Leaf Interlaboratory Test. Four samples were submitted: Blueberry leaves, Oak Leaves, Litterfall (Pine branches) and a grass sample. Surprisingly a high percentage of non tolerable results could be found for mandatory elements especially phosphorous (15.9%), calcium (14.7%), magnesium (19.3%) and potassium (21.0%).  >>>
13th Needle/Leaf Interlaboratory Comparison Test - 2010/2011
 14.01.11
60 laboratories in 29 countries participated in the 13th Needle/Leaf Interlaboratory Test. Four samples were submitted: Foliage litter, Oak Leaves, Spruce Needles, Pinus pinea. The results of the participating laboratories are in the 13th Interlaboratory Comparison Test better than before.  >>>
12th Needle/Leaf Interlaboratory Comparison Test - 2009/2010
 04.01.11
56 Laboratories from 30 countries participated in this test. The quality feedback and the following improvement in the practical laboratory work after the 11th Interlaboratory Comparison Test show here the first positive effect. The results of this test are in general better than in the last Interlaboratory Comparison Tests. Also the results of a lot of participating laboratories show a clear improvement in their quality.
 >>>
11th Needle/Leaf Interlaboratory Comparison Test - 2008/2009
 20.02.09
56 Laboratories from 28 countries participated in this test. With the start of the Life+ Future Monitoring Project (FutMon) in the beginning of 2009, a new system for qualification and re-qualification was planned. Together with the ringtest report each participant will receive a qualification report. Re-qualification is mandatory for laboratories of the FutMon partners and recommended for ICP-Forests laboratories.  >>>
10th Needle/Leaf Interlaboratory Comparison Test - 2007/2008
 20.02.09
54 European laboratories participated in this test - 52 laboratories were sending 10912 results till end of 2007. Lower tolerable limits for the mandatory parameters were used in this test, because of the improvement of the data quality in most of the laboratories. The results show generally a good analytical quality in foliar analysis. Especially the results for N and C are really good and are better than those in the previous tests.  >>>
9th Needle/Leaf Interlaboratory Comparison Test - 2006/2007
 22.01.07
54 European laboratories participated in this test - 53 laboratories were sending 10944 results. The results of the 9th Interlaboratory Comparison Test show an improvement of the analytical quality in foliar analysis, especially for the mandatory parameters. Only two laboratories, which are analyzing level II samples, have problems. >>>
8th Needle/Leaf Interlaboratory Comparison Test - 2005/2006
 04.01.07
56 European laboratories participated in this test - 53 laboratories were sending 10864 results. The results of the 8th Interlaboratory Comparison Test show generally a good analytical quality in foliar analysis - only a few laboratories have bigger problems.  >>>
7th Needle/Leaf Interlaboratory Comparison Test 2004/2005
 26.01.06
The results of the 7th Interlaboratory Comparison Test show generally a good analytical quality in foliar analysis. A few of the laboratories must change their methods or check their methods with standard reference materials, ring test samples or primary standards. Calibration problems of the element analysers appear to be solved. Most of the labs (90%) are using control charts as a daily routine procedure.  >>>
6th Needle/Leaf Interlaboratory Comparision Test 2003/2004
 26.01.06
The 6th Needle/Leaf Interlaboratory Comparison Test 2003/2004 was organised from the Forest Foliar Co-ordinating Centre. 46 labs from 26 countries taking part in this test. The results of the 6th Interlaboratory comparison test show generally a good analytical quality in foliar analysis. Few of the laboratories had to learn from their ringtest results, especially laboratories with outliers and/or results outside of the tolerable limits. A few of the laboratories must change their methods (e.g. dry ashing!!!).  >>>
5th Needle/Leaf Interlaboratory Comparision Test 2001/2002
 26.01.06
The percentage of results outside the given tolerable limits decreased for all elements, especially for all mandatory elements. Even for Nitrogen and Carbon, where the limits were tightened significantly, we do not notice any significant deterioration. The reason may be that according to the suggestions of ICP-Forests some laboratories changed from classical methods to CNS-elemental analysers and are probably still short on experience with these apparatus. >>>
4th Needle/Leaf Interlaboratory Comparision Test 1999/2000
 26.01.06
Whereas the results from the few laboratories that used both variants (with and without hydrofluoric acid) were clearly better when using hydrofluoric acid, the differences disappeared when looking at the overall results. Seemingly digestion and/or determination are so faulty that the differences between the methods applied within one laboratory disappear among all participants. Because of that, the methodology has to be discussed again. >>>
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