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.

ProgramDeterminand groupDeterminand
ISEReal totalsAg, 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$, Zr$
ISEAcid 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$, Zr
ISEAqua Regia (ISO 11466)Ag, Al$, 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$, Zr
ISEExtraction with boiling 2M HNO3Cd$, Co$, Cr$, Cu$, Hg$, Mo$, Ni$, Pb$, Tl, Zn$
ISEExtraction with 0.1M NaNO3Cd, Cu, Ni, Pb, Zn
ISEExtraction with 0.01M CaCl2 1:10Al, B, Cd, CN, Co, Cr, Cu, Fe, K$, Mg, Mn, N - NH4 (as N)$, N - NO3 (as N)$, N total soluble, Na, Ni, P, Pb, SO4, Zn
ISESoil characteristicsC - org others (W&B a.o.)$, 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$, Fraction > 63 µm$
ISEOther determinationsB - Hot water, CN - Free, CN - Total, delta 13C, delta 15N, K - HCl (as K), Mg - NaCl (as Mg), Moisture-content$
ISEFluoride (Swiss standard procedure)F - Total
ISEDigestion 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
ISEPot. CEC using 1M NH4-acetate at pH=7CEC$, Al, Ca$, K$, Mg$, Na$
ISEPot. CEC using 1M or 0.1M BaCl2-TEA at pH=8.1 (ISO 13536 OR BZE)CEC, Al, Ca, K, Mg, Na
ISEPot. CEC using 1M NH4Cl (BZE)CEC, Al, Ca, Fe, H, K, Mg, Mn, Na
ISEAct. CEC using 0.01M BaCl2 (ISO 11260)CEC, Al, Ca, Fe, H, K, Mg, Mn, Na
ISEAct. CEC using 0.1M BaCl2 (UNEP-UN/EC 91065A)CEC, Al, Ca, Fe, H, K, Mg, Mn, Na
ISEAct. CEC using cobaltihexamine (AFNOR NFX 31 130)CEC$, Al, Ca$, Fe, H, K$, Mg$, Mn, Na$
ISEMehlich-3Al$, As, B$, Ca$, Cd, Cr, Co, Cu$, Fe$, K$, Mg$, Mn$, Se, Na$, P$, Pb, Zn$
ISEExtraction with Ca-lactate (VDLUFA, Germany)K, P
ISEExtraction with double lactate (VDLUFA, Germany)K, P
ISEWater soluble 1:10 (w/v) (EN-12457-4)Br, Cl, F, N - NO3 (as N)
ISEExtraction with 0.01M CaCl2 - 0.005M DTPA 1:10 (w/v)Cu$, Fe$, Mn$, Zn$
ISEExtraction with 1M KCl 1:10 (w/v)N - NH4 (as N)$, N - NO3 (as N)$
ISEPhosphorus and related analysisP - Ox, Al - Ox, Fe - Ox, P - AL (as P)$, P - w (as P), P - Bray (as P), P - Olsen (as P)$
ISEExtraction with 1M HCl (Polish standard)B, Cu, Fe, Mn, Zn
ISEWater soluble 1:10 (w/v) (Neth standard VPR C85-06)Br, Cl, F, SO4
ISEUK Soil MethodsK - NH4NO3 (1/5)$, Mg - NH4NO3 (1/5)$, P – NaHCO3 (1/20)$, pH - H2O (2/5)$
ISEExtraction with dilute nitric acid (0.43 Mol/l) ISO 17586Ag, 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
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