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Kmetijski inštitut Slovenije, Ljubljana (KISLJ)
  • Validation of analytical methods used for determination of nitrate in soil
    Kmecl, Veronika ; Sušin, Janez ; Zupančič-Kralj, Lucija
    The standard method (ISO/DIS 14255) and the quick test were used for determination of nitrate in soil. We validated both methods using parameters such as accuracy, reproducibility within one day and ... between days, limit of detection and limit of quantification. The accuracy of the results was determined using the analysis of samples from the international interlaboratory scheme WEPAL. The accuracy of the standard method was good, while for the quick test the results were not accurate. The standard method showed a solid reproducibility of measurement results (in 1 day, relative standard deviation, RSD=0.2%; between days, RSD=0.8%). The quick test gave poorer results (in 1 day, RSD=6%; between days, RSD=7%). We tried to establish the compatibility of both methods on real soil samples and we were satisfied to obtain the correlation coefficient 0.98 using the regression straight line. The analyses with the quick field instrument are much simpler and cheaper than the standard laboratory analyses and can be used for advising on nitrogen fertilisation.
    Vir: Accreditation and quality assurance : journal for quality, comparability and reliability in chemical measurement. - ISSN 0949-1775 (Vol. 10, No. 4, 2005, str. 172-176)
    Vrsta gradiva - članek, sestavni del
    Leto - 2005
    Jezik - angleški
    COBISS.SI-ID - 1932392

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