DIGITALNA ARHIVA ŠUMARSKOG LISTA
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T. Jakovljević, G. Pánczél, M. Manninger, N. Potočić, I. Seletković, T. Dubravac, M. Gradečki-Poštenjak: LIŠĆE ... Šumarski list br. 7–8, CXXXIV (2010), 361-370 kontrolni grafikoni za metodu B za dušik pokazuju dnevne razlike u mjerenjima i više od 30 % rezultata su izvan preporučenih granica kontrolni grafikon za metodu B za ugljik pokazuje dobru ponovljivost rezultata mjerenja i svi su rezultati unutar preporučenih granica. Određivanje ukupnog dušika i ugljika na elementarnom analizatoru CNS 2000 (Metoda A) pokazala je dobru ponovljivost analize referentnog materijala. Obnovljivost rezultata u laboratoriju u mađarskoj pokazala je da elementarni analizator EA3000 (Metoda B) pokazuje veliku osjetljivost i da je prikladniji za odre- LITERATURAEC-UN/ECE, Stefan, K.,A. Fürst, R. Hacker, U. Bartels, 1997.: Forest Foliar Condition in Europe. Technical Report. EC and UN/ECE, Brussels, Geneva. rd EC-UN/ECE, Bartels, U 1998: ICP-Forests 3 Ne- edle/Leaf InterlaboratoryTest 1997/98 –Results. Jakovljević,T., 2006: Folijarneanalizeuzorakas plohaintenzivnogmotrenjaiinterlaboratorijska ispitivanjausklopuprogramaICPForests, Radovi, Šumarskiinstitut, Izv. Izdanje9, 369–376. Jakovljević, T., K. Berković, G. Tartari, B. Vrbek, J. Vorkapić Furač,2009:Atmosferska taloženja u šumskim ekosustavima Europe i istraživanje novih metoda određivanja fosfora i amonijakalnog dušika u okviru ICPForests pro- grama, Šumarski list 135 (5–6): 267–278. Košiček, M.,2007.:Statistika u validaciji analitičkih metoda, HMD, Zagreb Marchetto,A., R.Mosello, J.Derome, K.Derome, P.Sorsi König, N.Clarke, G.Tartari,. A. Kowalska, 2009: First combinbed FutMON- ICP Forests atmospheric deposition and soil solutionWorking Ring Test. đivanja dušika i ugljika u čistim, kemijskim supstancama zbog nehomogenosti uzoraka lišća bukve. Male odvage referentnog materijala za kalibraciju instrumenta u usporedbi s odvagom uzorka negativno utječu na proces kalibracije. Kemijske analiza šumskog biljnog materijala ograničene su zaizbor instrumenata i metoda za određivanje pojedinih elemenata, stoga ovakva testiranja potvrđuju bolju primjenjivost elementarnih analizatora,kao što je CNS 2000 za određivanje dušika i ugljika zbog specifičnosti uzoraka. – References ISO 5725 :1986: Precision of test methods. Determination of repeatibility and reproducibility for a standard test method by inter-laboratory tests. UN EC ICPForests, 2006:Manual on methods and criteria for harmonized sampling, assessment, monitoring and analyses of the effects of air pollution on forests, Part IV, Sampling andAnalysis of Needles and Leaves. ISO 8258:1998: Shewhart control charts. Miller, J.N., 2005: Statistics and chemometrics for th analytical chemistry, 5 Edition, Pearson Education Limited, UK. Holler, F.J., D.A.Skoog, S. R.Crouch,2007: th Priniples of Instumental Analysis, 6 redition, Thomson Brooks,, 895–899, USA. HRN EN ISO/IEC 17025:2007:Opći zahtjevi za osposobljenost ispitnih i umjernih laboratorija. HAA-Pr-2/6, 2009: Pravila za međulaboratorijska i dru ga poredbena ispitivanja. LECO corporation, 2000: Organic aplication note form No. 203 – 821 –172, Carbon, Nitrogenand Sulfur in PlantTissue,St. Joseph,USA. SUMMARY: Within the framework of International Co-operative Programme on Assessment and Monitoring of Air Pollution Effects on Forests (ICP Forests), research and chemical analyses of plant material has been carried out in Croatia on seven intensive monitoring plots with typical forest communities. In order to monitor the reliability of methods of laboratory analyses, as well as to ensure operational quality of analytical methods that can be applied in leaves and needles analysis, each year Inter-laboratory testing on samples prepared in laboratories of countries taking part in ICP Forest is organised. Croatian forest research institute, prepared leaves of common beech as reference sample for this programme that is now used also as the laboratory reference material. In this work, the interlaboratory measurements and repeatabilty and reproducibility were tested between results of determination total nitrogen and car |