Sodium carbonate, reference material for NIST, 50g

99.95+% Na2CO3 For laboratory use, reference material for NIST Traceability: Reference standards acc. NIST SRM 723e Specs Assay 99.95% Aluminium (Al) 0.001% Arsenic (As) 0.00005% Calcium (Ca) 0.005% Cadmium (Cd) 0.0005% Copper (Cu) 0.0005% Iron (Fe) 0.0005% Potassium (K) 0.005% Magnesium (Mg) 0.0005% Lead (Pb) 0.0005% Zinc (Zn) 0.0005% Chloride (Cl) 0.001% Sulfate (SO4) 0.003% Phosphate (PO4) 0.001% Silicate (SiO2) 0.002% Nitrogen (N) 0.001% Loss on drying 0.5% @ 300°C Heavy Metals as Lead (Pb) 0.0005%