Is there any way to increase the life of the Lachat cadmium column for Nitrate determination (Catalog Number/Order Code 50237A)?
Tips for cadmium columns
There are a couple of suggestions that can be considered. The cadmium columns are packed in water. Hooking them up to pump some buffer the day prior to use may help. A small amount of copper sulfate can be added to the buffer solution to help keep the cadmium copperized. The copper would be added to the buffer solution used when running the method. Two drops of a solution of 20 g/L copper sulfate can be added to each one liter of buffer. A weaker solution can be considered if buffer is prepared in smaller amounts.