title: Estimation of uncertainty arising from different soil sampling devices: the use of variogram parameters.
abstract: In the frame of the international SOILSAMP project, funded and coordinated by the National Environmental Protection Agency of Italy (APAT), uncertainties due to field soil sampling were assessed. Three different sampling devices were applied in an agricultural area using the same sampling protocol. Cr, Sc and Zn mass fractions in the collected soil samples were measured by k(0)-instrumental neutron activation analysis (k(0)-INAA). For each element-device combination the experimental variograms were calculated using geostatistical tools. The variogram parameters were used to estimate the standard uncertainty arising from sampling. The sampling component represents the dominant contribution of the measurement uncertainty with a sampling uncertainty to measurement uncertainty ratio ranging between 0.6 and 0.9. The approach based on the use of variogram parameters leads to uncertainty values of the sampling component in agreement with those estimated by replicate sampling approach.
authors: Agenzia per la Protezione dell'Ambiente e per i Servizi Tecnici (APAT), Servizio Laboratori, Misure ed Attività di Campo, Via di Castel Romano, 100-00128 Roma, Italy. paolo.dezorzi@apat.it
authors: Paolo
authors: P
authors: de Zorzi
authors: Sabrina
authors: S
authors: Barbizzi
authors: Maria
authors: M
authors: Belli
authors: Maria
authors: M
authors: Barbina
authors: Ales
authors: A
authors: Fajgelj
authors: Radojko
authors: R
authors: Jacimovic
authors: Zvonka
authors: Z
authors: Jeran
authors: Sandro
authors: S
authors: Menegon
authors: Alessandra
authors: A
authors: Pati
authors: Giannantonio
authors: G
authors: Petruzzelli
authors: Umberto
authors: U
authors: Sansone
authors: Marcel
authors: M
authors: Van der Perk
mesh_terms: D000383:Agriculture; D002138:Calibration; D002857:Chromium / Q000032:analysis; D004784:Environmental Monitoring / Q000379:methods* / Q000706:statistics & numerical data; D007558:Italy; D011786:Quality Control; D015203:Reproducibility of Results; D012538:Scandium / Q000032:analysis; D012680:Sensitivity and Specificity; D012989:Soil Pollutants / Q000032:analysis*; D013048:Specimen Handling / Q000379:methods; D035501:Uncertainty; D015032:Zinc / Q000032:analysis
chemical_list: D012989:Soil Pollutants; D002857:Chromium; D015032:Zinc; D012538:Scandium