Purity (metallic): ≥ 99.995 %

Assay (acidimetric): ≥ 99.5 %

Spec. Absorbance A at 260 nm (2 cm, 10%, water): ≤ 0.010

Chloride (Cl): ≤ 5 ppm

Sulfate (SO₄): ≤ 30 ppm

As (Arsenic): ≤ 0.1 ppm

Ba (Barium): ≤ 5.0 ppm

Ca (Calcium): ≤ 0.50 ppm

Cd (Cadmium): ≤ 0.005 ppm

Ce (Cerium): ≤ 0.010 ppm

Co (Cobalt): ≤ 0.010 ppm

Cu (Copper): ≤ 0.005 ppm

Eu (Europium): ≤ 0.010 ppm

Fe (Iron): ≤ 0.10 ppm

Hg (Mercury): ≤ 0.05 ppm

La (Lanthanum): ≤ 0.010 ppm

Mg (Magnesium): ≤ 0.50 ppm

Mn (Manganese): ≤ 0.010 ppm

Na (Sodium): ≤ 20.0 ppm

Ni (Nickel): ≤ 0.010 ppm

Pb (Lead): ≤ 0.005 ppm

Sm (Samarium): ≤ 0.010 ppm

Sr (Strontium): ≤ 0.50 ppm

Tl (Thallium): ≤ 0.01 ppm

Y (Yttrium): ≤ 0.010 ppm

Yb (Ytterbium): ≤ 0.010 ppm

Zn (Zinc): ≤ 0.005 ppm