Hach - Avantor Performance Materials - 500G Sodium Phosphate Monobasic Monohydrate Multi-Compendial; Grade: Usp; Assay: 98-103%; Cas Number: 10049-21-5; Hazardous: No; Container Material: Amber Glass For Determination Of Cod. Manufacturer: Supply Solutions HACH 2415915. Digestion vials is used for the determination of Chemical Oxygen Demand