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$, F, Fe$, Ga$, Ge, Hg$, I, K$, La$, Li, Mg$, Mn$, Mo$, N - elementary$, Na$, Nb$, Nd$, Ni$, P$, Pb$, Pd, Pt, Rb$, Rh, S$, Sb$, Sc, Se, Si$, Sn$, Sr$, Te, Th$, Ti$, Tl, U, V$, W, Y$, 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 | Digestion with conc. HNO3 + conc. HCl + H2O2 (UNEP-UN/EC 91075A) | Al, As, B, Ba, Be, Ca, Cd, Co, Cr, Cu, Fe, Hg, K, Li, Mg, Mn, Mo, Na, Ni, Pb, Rb, S, Sb, Se, Si, Sn, Sr, Tl, V, Zn |
| 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$, Mn$, Se, Na$, P$, 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 |