General - Scope - Soil
Wageningen University is accredited for the organization of Interlaboratory Studies by the Dutch Accreditation Council RvA under registration number R002. The accreditation is based on the ISO/IEC- requirements (General requirements for proficiency testing, ISO/IEC 17043:2010). Determinands only meet the criteria for accreditation if the results are reported by a sufficient number of participants for at least three years and the results have proven to be homogeneous and stable.
Elements noted with $ are not in the scope of the accreditation.
| Program | Determinand group | Determinand |
|---|---|---|
| ISE | Real totals | Ag$, Al, As, B$, Ba, Be$, Bi$, Br, C-elementary, Ca, Cd, Ce, Co, Cr, Cs$, Cu, Dy$, F$, Fe, Ga, Gd$, Ge$, Hg, I$, K, La, Li$, Mg, Mn, Mo$, N - elementary, Na, Nb, Nd, Ni, P, Pb, Pd$, Pr$, Pt$, Rb, Rh$, S, Sb, Sc$, Se$, Si, Sm$, Sn, Sr, Te$, Th, Ti, Tl$, U$, V, W$, Y, Yb$, Zn, Zr |
| ISE | Acid extractable (So-called totals) | Ag$, Al, As, B$, Ba, Be, Bi$, Br$, Ca, Cd, Ce$, Co, Cr, Cu, F$, Fe, Ga$, Hg, I$, K$, La$, Li$, Mg, Mn, Mo, N, Na$, Nb$, Nd$, Ni, P, Pb, Pt$, Rb$, S, Sb, Sc$, Se$, Si$, Sn, Sr$, Te$, Th$, Ti$, Tl$, U$, V, Y$, Zn, Zr$ |
| ISE | Aqua Regia (ISO 11466) | Ag$, Al, As, B, Ba, Be, Bi$, Br$, Ca, Cd, Ce$, Co, Cr, Cu, F$, Fe, Ga$, Hg, I$, K, La$, Li$, Mg, Mn, Mo, Na, Nd$, Ni, P, Pb, Pt$, Rb$, S, Sb, Sc$, Se, Si$, Sn$, Sr, Te$, Th$, Ti, Tl$, U$, V, Y$, Zn, Zr$ |
| ISE | Extraction with boiling 2M HNO3 | Cd, Co, Cr, Cu, Hg, Mo, Ni, Pb, Tl$, Zn |
| ISE | Extraction with 0.1M NaNO3 | Cd$, Cu$, Ni$, Pb$, Zn$ |
| ISE | Extraction with 0.01M CaCl2 1:10 | Al$, B$, Cd$, CN$, Co$, Cr$, Cu$, Fe$, K, Mg$, Mn$, N - NH4 (as N), N - NO3 (as N), N total soluble$, Na$, Ni$, P, Pb$, SO4$, Zn$ |
| ISE | Soil characteristics | C - org others (W&B a.o.), TIC=Tot.Inorg C(as CaCO3), TOC=Total Org. C, TC=Total C (org.+inorg.), Org.matter (L.O.I.), Active Lime (as CaCO3)$, EC-SC (ISO 11265), pH - CaCl2, pH - H2O, pH - KCl, Fraction < 2 µm, Fraction < 16 µm, Fraction < 63 µm, Fraction > 63 µm |
| ISE | Other determinations | B - Hot water$, CN - Free$, CN - Total$, delta 13C$, delta 15N$, K - HCl (as K)$, Mg - NaCl (as Mg)$, Moisture-content |
| ISE | Fluoride (Swiss standard procedure) | F - Total$ |
| ISE | Pot. CEC using 1M NH4-acetate at pH=7 | CEC, Al$, Ca, K, Mg, Na |
| ISE | Pot. CEC using 1M or 0.1M BaCl2-TEA at pH=8.1 (ISO 13536 OR BZE) | CEC$, Al$, Ca$, K$, Mg$, Na$ |
| ISE | Pot. CEC using 1M NH4Cl (BZE) | CEC$, Al$, Ca$, Fe$, H$, K$, Mg$, Mn$, Na$ |
| ISE | Act. CEC using 0.01M BaCl2 (ISO 11260) | CEC$, Al$, Ca$, Fe$, H$, K$, Mg$, Mn$, Na$ |
| ISE | Act. CEC using 0.1M BaCl2 (UNEP-UN/EC 91065A) | CEC$, Al$, Ca$, Fe$, H$, K$, Mg$, Mn$, Na$ |
| ISE | Act. CEC using cobaltihexamine (AFNOR NFX 31 130) | CEC, Al$, Ca, Fe$, H$, K, Mg, Mn$, Na$ |
| ISE | Mehlich-3 | Al, As$, B, Ca, Cd$, Cr$, Co$, Cu, Fe, K, Mg, Mn, Na, P, Se$, Pb$, Zn |
| ISE | Extraction with Ca-lactate (VDLUFA, Germany) | K$, P$ |
| ISE | Extraction with double lactate (VDLUFA, Germany) | K$, P$ |
| ISE | Water soluble 1:10 (w/v) (EN-12457-4) | Br$, Cl$, F$, N - NO3 (as N)$ |
| ISE | Extraction with 0.01M CaCl2 - 0.005M DTPA 1:10 (w/v) | Cu, Fe, Mn, Zn |
| ISE | Extraction with 1M KCl 1:10 (w/v) | N - NH4 (as N), N - NO3 (as N) |
| ISE | Phosphorus and related analysis | P - Ox$, Al - Ox$, Fe - Ox$, P - AL (as P), P - w (as P)$, P - Bray (as P)$, P - Olsen (as P) |
| ISE | Extraction with 1M HCl (Polish standard) | B$, Cu$, Fe$, Mn$, Zn$ |
| ISE | Water soluble 1:10 (w/v) (Neth standard VPR C85-06) | Br$, Cl$, F$, SO4$ |
| ISE | UK Soil Methods | K - NH4NO3 (1/5), Mg - NH4NO3 (1/5), P – NaHCO3 (1/20), pH - H2O (2/5) |
| ISE | Extraction with dilute nitric acid (0.43 Mol/l) ISO 17586 | Ag$, Al$, As$, B$, Ba$, Be$, Br$, Ca$, Cd$, Co$, Cr$, Cu$, Fe$, Hg$, K$, Mg$, Mn$, Mo$, Na$, Ni$, P$, Pb$, S$, Sb$, Se$, Sn$, Sr$, Te$, Ti$, Tl$, V$, Zn$ |