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.
Determinands that are not in bold are not subject to 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, 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, Cu, Fe, K, Mg, Mn, 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 |