Sulfate (SO4-2), 1000µg/ml in Water, 500ml Back Catalog number: 54506 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended E4600-50ML FE4600Matrix Mod Mg 10g/L ,050LPF Price on request E4047-500ML FE4047Molybdenum for AAS 1g/L ,500LPF Price on request E4054-100ML FE4054 Phosphorus for AAS 1g/L ,100LPF Price on request