2.Contaminants in an organic fertiliser must not exceed the following limit values:U.K.
(a) cadmium (Cd)
:
1,5 mg/kg dry matter,
(b) hexavalent chromium (Cr VI)
:
2 mg/kg dry matter,
(c) mercury (Hg)
:
1 mg/kg dry matter,
(d) nickel (Ni)
:
50 mg/kg dry matter,
(e) lead (Pb)
:
120 mg/kg dry matter, and
(f) inorganic arsenic (As)
:
40 mg/kg dry matter.
Biuret (C2H5N3O2) must not be present in an organic fertiliser.