Do high pH and alkalinity interfere with cadmium reduction methods for nitrate?

Document ID

Document ID TE3630

Published Date

Published Date 27/05/2017
Question
Do high pH and alkalinity interfere with cadmium reduction methods for nitrate?
Summary
Effects of high pH and alkalinity on cadmium reduction methods for nitrate.
Answer
High pH and alkalinity can affect cadmium reduction methods for nitrate.

After the addition of the NitraVer® 5 reagent, the pH should be between 2.7 and 3.2. If the pH is greater, the pH of the original sample will need to be adjusted.

Fill a clean container with 500 ml of sample water and add one drop of 5.25 N Sulfuric acid. Take 10 ml of the treated water and run the test again. If the sample pH is below 3.2 after reagent addition, record the nitrate value measured. If the pH value is above 3.2, more sulfuric acid needs to be added.