CAS 7439-91-0 appears in our catalog under these names: LANTHANUM, FOIL 100X100MM, THICKNESS 0.&, Contains 1% La (from lanthanum oxide) in 2% HCl, Lanthanum Standard: La @ 1000 µg/g in Hydrocarbon Oil, Lanthanum - La @ 1000 µg/mL in 5% HNO3, Lanthanum Standard: La @ 1000 µg/mL in 5% HNO3. Offered by: Sigma-Aldrich, VHG, Chemat, Thermo Scientific (Alfa Aesar). Available pack sizes: 1EA, 500ml, 50g, 50ml, 250ml, 100ml, 10g, 25g.