RICCA Chemical Oxygen Demand Standard, 1500 ppm COD, 1 L Natural Poly Item No: 5868.15-32 $197.07 (1 L)
RICCA Potassium Acid Phthalate Standard, 1000 ppm Chemical Oxygen Demand (COD), 500 mL Natural Poly Item No: 5868-16 $51.34 (500 mL)