Scope - Manure and Compost

Compost, (dry)sewage sludge, organic fertilizers

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.

Scheme

Measurand group

Measurand

MARSEP

Inorganic Chemical Composition AE

Ag^$, Al, As, B, Ba, Be^$, Bi^$, Ca, Cd, Ce^$, Cl^$, Co, Cr, Cu, F^$, Fe, Ga^$, Hg, I^$, K, Li^$, Mg, Mn, Mo, N, N - NH4 (as N)^$, N - NO3 (as N)^$, Na, Ni, OC = org.C^$, P, Pb, S, S - SO4 (as S)^$, Sb^$, Se^$, Si^$, Sn^$, Sr^$, TC =totalC (org+inorg), Th^$, Ti^$, Tl^$, TOC =total org.C^$, U^$, V, Zn 47 measurands, 24 accredited

Measurand	Full name	Unit	Concentration range	Constant error	Proportional error	Accredited
Ag	Silver	µg/kg	0 - 35000			$
Al	Aluminum	g/kg	0 - 75	1.5	12.5	yes
As	Arsenic	mg/kg	0 - 20	0.4	10	yes
B	Boron	mg/kg	0 - 100	5	20	yes
Ba	Barium	mg/kg	0 - 750	6	12.5	yes
Be	Beryllium	µg/kg	0 - 3000	60	20	$
Bi	Bismuth	µg/kg	5 - 20000			$
Ca	Calcium	g/kg	0 - 500	0	6	yes
Cd	Cadmium	mg/kg	0 - 5	0	10	yes
Ce	Cerium	mg/kg	1 - 30			$
Cl	Chloride	mg/kg	10 - 7500			$
Co	Cobalt	mg/kg	0 - 150	0.1	10	yes
Cr	Chromium	mg/kg	0 - 400	0	17.5	yes
Cu	Copper	mg/kg	0 - 1000	2	6	yes
F	Fluorine	mg/kg	0 - 2000			$
Fe	Iron	g/kg	0 - 150	0.3	7.5	yes
Ga	Gallium	µg/kg	100 - 75000			$
Hg	Mercury	µg/kg	0 - 4000	10	10	yes
I	Iodine	µg/kg	50 - 20000			$
K	Potassium	g/kg	0 - 125	0.5	7.5	yes
Li	Lithium	mg/kg	0 - 25			$
Mg	Magnesium	g/kg	0 - 30	0.1	7	yes
Mn	Manganese	mg/kg	0 - 4000	5	6	yes
Mo	Molybdenum	mg/kg	0 - 30	0.2	10	yes
N	Nitrogen	g/kg	0 - 125	0.6	3	yes
N - NH4 (as N)	Ammonium (expressed in N)	mg/kg	0 - 50000			$
N - NO3 (as N)	Nitrate (expressed in N)	mg/kg	0 - 20000			$
Na	Sodium	g/kg	0 - 20	0.08	7	yes
Ni	Nickel	mg/kg	0 - 150	0.4	8	yes
OC = org.C	Organic Carbon	g/kg	0 - 500			$
P	Phosphorus	g/kg	0 - 50	0.09	6	yes
Pb	Lead	mg/kg	0 - 500	1	8	yes
S	Sulphur	mg/kg	0 - 75000	200	10	yes
S - SO4 (as S)	Sulfate (expressed as Sulpher)	mg/kg	50 - 150000			$
Sb	Antimony	µg/kg	0 - 10000	40	17.5	$
Se	Selenium	µg/kg	0 - 4000	90	20	$
Si	Silicon	g/kg	0 - 5000			$
Sn	Tin	mg/kg	0 - 100	0.8	15	$
Sr	Strontium	mg/kg	0 - 500	2	15	$
TC =totalC (org+inorg)	Carbon (total)	g/kg	0 - 750	8.5	6	yes
Th	Thorium	mg/kg	0 - 0.2			$
Ti	Titanium	mg/kg	0 - 2500			$
Tl	Thallium	µg/kg	0 - 1500	0	0	$
TOC =total org.C	Total Organic Carbon	g/kg	0 - 700			$
U	Uranium	mg/kg	0 - 4			$
V	Vanadium	mg/kg	0 - 50	0.15	20	yes
Zn	Zinc	mg/kg	0 - 2500	4	6	yes

MARSEP

Other determinations OD

AOX^$, COD^$, dry weight, loss-on-ignition, mineral oil^$, residue-on-ignition^$ 6 measurands, 2 accredited

Measurand	Full name	Unit	Concentration range	Constant error	Proportional error	Accredited
AOX	Adsorbable Organic Halides	mg/kg	0 - 1750	9	6	$
COD	Chemical Oxygen Demand	g/kg	200 - 1000			$
dry weight	dry weight	%	85 - 98	1	0	yes
loss-on-ignition	L.O.I.	%	0 - 95	0.9	0	yes
mineral oil	mineral oil	g/kg	0 - 20			$
residue-on-ignition	R.O.I.	%	5 - 90			$