Hach, 50237A, Column, Cadmium, for Nitrate determination

Lachat Cadmium Columns (Product Number 50237A) are specialized, packed columns used on the Lachat Flow Injection Analyzer to reduce nitrate to nitrite for water quality testing.
Key Specifications & Maintenance
Function
Reduces nitrate (NO
₃
2-
) to nitrite (NO
) so it can be colorimetrically analyzed using the Greiss reagent. The Greiss reagent works via a diazotization reaction with nitrite to form a highly colored, pink/purple azo dye.
Efficiency
Calculated by dividing the nitrate response by the nitrite response:
E=
(NO
/ NO
) x 100
Lifespan Tip
Adding 2 drops of 2g/100 mL copper sulfate solution per liter of buffer can extend column life by keeping the cadmium properly copperized.