EDTA Solution, 0.01M (0.02N), available in 500mL (No. 146415), 1L (No. 146416) and 4L (No. 146417) poly bottles, and 10L (No. 154173-4) and 20L (No. 154173-5) Cubitainers.1mL = 1mg CaCO3.Traceable to NIST.APHA 2340C.