Ammonium ceric sulfate

Code	S-2.5N	S-3.5N	S-4N
Total amount of rare earth oxides %	≥32	≥35	≥35
Cerium purity and relative rare earth impurities
CeO₂/TREO %	≥99.9	≥99.95	≥99.99
La₂O₃/TREO %	≤0.05	≤0.030	≤0.004
Pr₆O₁₁/TREO %	≤0.02	≤0.005	≤0.002
CeO₂/TREO %	≤0.02	≤0.005	≤0.002
Sm₂O₃/TREO %	≤0.005	≤0.005	≤0.001
Y₂O₃/TREO %	≤0.005	≤0.005	≤0.001
Non rare earth impurity
Fe %	≤0.005	≤0.002	≤0.001
Ca %	≤0.02	≤0.005	≤0.001
Cd %	≤0.0005	≤0.0005	≤0.0003
K %	≤0.0005	≤0.0005	≤0.0003
Na %	≤0.0005	≤0.0005	≤0.0003
Ni %	≤0.0005	≤0.0005	≤0.0003
Pb %	≤0.005	≤0.002	≤0.0003
Cl^–	≤0.005	≤0.002	≤0.001

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