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). Measurands 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.
Measurands marked with $ are not in the scope of the accreditation.
Details
Scheme
Measurand group
Measurand
IPE
Acid extractable (So-called totals)
AE
Al,
Si$
2 measurands, 1 accredited
Measurand
Full name
Unit
Concentration range
Constant error
Proportional error
Accredited
Al
Aluminum
mg/kg
0 - 1200
yes
Si
Silicon
mg/kg
not specified
$
IPE
Inorganic Chemical Composition
IN
Ag$,
As,
B,
Ba,
Be$,
Bi$,
Br$,
Ca,
Cd,
Cl (as Cl),
Co,
Cr,
Cs$,
Cu,
F$,
Fe,
Ga$,
Hg,
I$,
K,
Li$,
Mg,
Mn,
Mo,
N - Kjeldahl (as N),
N - NH4 (as N)$,
N - NO3 (as N)$,
Na,
Ni,
P (as P),
Pb,
Pd$,
Pt$,
Rb$,
Rh$,
S (as S),
Sb$,
Se,
Sn$,
SO4 (as SO4)$,
Sr,
Ti$,
V,
Zn
44 measurands, 25 accredited
Measurand
Full name
Unit
Concentration range
Constant error
Proportional error
Accredited
Ag
Silver
µg/kg
not specified
$
As
Arsenic
µg/kg
0 - 2500
10
12.5
yes
B
Boron
mg/kg
0 - 250
1
10
yes
Ba
Barium
mg/kg
0 - 150
0.2
10
yes
Be
Beryllium
µg/kg
0 - 150
1
25
$
Bi
Bismuth
µg/kg
not specified
$
Br
Bromine
mg/kg
0 - 100
0.1
10
$
Ca
Calcium
g/kg
0 - 40
0.1
7.5
yes
Cd
Cadmium
µg/kg
0 - 4000
5
12.5
yes
Cl (as Cl)
Chloride
g/kg
0 - 20
0.2
7.5
yes
Co
Cobalt
µg/kg
0 - 8000
10
12.5
yes
Cr
Chromium
µg/kg
0 - 16000
120
12.5
yes
Cs
Cesium
µg/kg
0 - 500
6
15
$
Cu
Copper
mg/kg
0 - 25
0.5
9
yes
F
Fluorine
mg/kg
not specified
$
Fe
Iron
mg/kg
0 - 1100
5
10
yes
Ga
Gallium
µg/kg
not specified
$
Hg
Mercury
µg/kg
0 - 700
2
12.5
yes
I
Iodine
µg/kg
0 - 2500
$
K
Potassium
g/kg
0 - 70
0.2
7.5
yes
Li
Lithium
µg/kg
0 - 18000
45
15
$
Mg
Magnesium
g/kg
0 - 30
0
7.5
yes
Mn
Manganese
mg/kg
0 - 1000
1
7.5
yes
Mo
Molybdenum
µg/kg
0 - 15000
35
12.5
yes
N - Kjeldahl (as N)
Nitrogen acc. to Kjeldahl (expressed in N)
g/kg
0 - 50
0.5
5
yes
N - NH4 (as N)
Ammonium (expressed in N)
mg/kg
not specified
$
N - NO3 (as N)
Nitrate (expressed in N)
mg/kg
0 - 12000
30
7.5
$
Na
Sodium
mg/kg
0 - 4000
20
10
yes
Ni
Nickel
µg/kg
0 - 16000
70
15
yes
P (as P)
Phosphorus (expressed as P)
g/kg
0 - 10
0
7.5
yes
Pb
Lead
µg/kg
0 - 6000
35
15
yes
Pd
Palladium
µg/kg
not specified
$
Pt
Platinum
µg/kg
not specified
$
Rb
Rhubidium
µg/kg
0 - 4
0
10
$
Rh
Rhubidium
µg/kg
not specified
$
S (as S)
Sulphur (expressed in Sulpher)
g/kg
0 - 60
0
10
yes
Sb
Antimony
µg/kg
0 - 300
8
20
$
Se
Selenium
µg/kg
0 - 600
15
20
yes
Sn
Tin
µg/kg
0 - 12000
6
20
$
SO4 (as SO4)
Sulfate
g/kg
not specified
0.3
12.5
$
Sr
Strontium
mg/kg
0 - 200
0
10
yes
Ti
Titanium
mg/kg
0 - 25
0
50
$
V
Vanadium
µg/kg
0 - 4000
15
15
yes
Zn
Zinc
mg/kg
0 - 250
2
7.5
yes
IPE
Nutritional values
NUT
ADF-ash-free$,
Crude fibre,
NDF-ash-containing$,
NDF-ash-free$,
Polysaccharides (starch)$,
Total ash,
Total Disaccharides$,
Total fat,
Total monosaccharides$
9 measurands, 3 accredited
