StandardsCationic StandardsMulti-Element StandardsVWR®, Alternate Metals II, 4 components: Ca 500 mg/l, Na 500 mg/l, K 100 mg/l, Mg 100 mg/l in 2% HNO₃
: USP
: EHRENSTORFER
: PerkinElmer
: CPACHEM
: Lovibond
: Thermo Fisher Scientific
: VWR Chemicals