COMBINED SIX CATION STANDARD-I - 6 COMPONENTS (Lithium (Li+) 50 mg/L; Sodium (Na+) 200 mg/L; Ammonium (NH4+) 400 mg/L; Potassium (K+) 200 mg/L; Calcium (Ca2+) 1000 mg/L; Magnesium (Mg2+) 200 mg/L in H2O) - traceable to NIST
Expiry: 6 months after opening