Supplier Page from Thermo Fisher Scientific for Silica, standard solution, Specpure:r, SiO{2} 1000µg/mL
Potassium hydrogen phthalate, ACS reagent, acidimetric standard from Thermo Fisher Scientific
Sulfur in Light Mineral Oil standard solution, Specpure:r, 1,000µmg/g (0.10%) from Thermo Fisher Scientific
Thulium, plasma standard solution, Specpure:r, Tm 1000µg/mL from Thermo Fisher Scientific
Zinc standard solution, for AAS, 1 µg/mL Zn in 2-5% HCl from Thermo Fisher Scientific