TM97-07 Replacement Chemical Oxygen Demand Instrumentation Operational

Effective December 9, 1996, new instrumentation for Chemical Oxygen Demand (COD), Method I3561-85, has been put into routine operation by National Water Quality Laboratory (NWQL) personnel. Chemical methodology and reagents are unchanged from TWRI Method I-3561-85. To document the instrumentation changes, a new Lab Code (2144) and a new method code (340C) have been assigned. The method reporting limit remains at 10 mg/L. The bottle type and preservation remain the same as Lab Code 76 (LC0076).