Supplier Page from Thermo Fisher Scientific for Tungsten, plasma standard solution, Specpure:r, W 10,000µg/mL
Calcium carbonate, ACS reagent, chelometric standard from Thermo Fisher Scientific
Silicon standard solution, for AAS, 1 µg/mL Si in 2% NaOH from Thermo Fisher Scientific
Strontium, plasma standard solution, Specpure:r, Sr 1000µg/mL from Thermo Fisher Scientific
Sulfur in Light Mineral Oil standard solution, Specpure:r, 25µmg/g (0.0025%) from Thermo Fisher Scientific