Specifications. Certifications/Compliance. EPA, OSHA. For Use With (Equipment) Standard COD reactor and spectrophotometer. Includes. 16mm vial with 1.5mL digestion solution, 3.5mL catalyst solution, and screw cap. View More Specs. Includes: 16mm vial with 1.5mL digestion solution, 3.5mL catalyst solution, and screw cap.