Sodium chloride solution standard substance for atomic absorption spectrophotometer calibration

Copper solution standard substance for atomic absorption spectrophotometer calibration (CU0.50G/ML) Permanent residual chlorine standard solution (potassium dichromate-potassium chromate) (tetramethylbenzidine colorimetric method) Copper solution standard substance for atomic absorption spectrophotometer DISSOLUTION MEDIA CONCENTRATE - 0.1N HY+0.5% SDS (SODIUM DODECYL SULPHATE), 961.5ML OF CONC. DILUTES TO 25L|REAGECON|6 X 961.5ML|Standard Material (RM) - Solution Type Turbidity Standard RATIO 60 NTU, traceable to NIST

Total Acid Value Standard: 3.0 MG/G KOH Silver, bismuth, cadmium, mercury, zinc multi-element standard solutions (5 types) Cadmium solution standard material for atomic absorption spectrophotometer (GBW(E)130869~130872 is 350 yuan per set. Order one of the standard materials and you will get one set. Please do not purchase repeatedly.) UV-Vis Spectrophotometer Standard Materials Turbidity Standards RATIO 0, 5 NTU, traceable to NIST