What can cause the sample to turn blue after reagent addition in molybdenum method 8036?

Document ID

Document ID TE5194

Version

Version 2.0

Status

Status Published

Published Date

Published Date 25/01/2018
Question
What can cause the sample to turn blue after reagent addition in molybdenum method 8036?
Summary
Blue color develops during method 8036
Answer
If a blue color develops while using method 8036, it is likely due to a reaction between CDTA and a metal. The metal is probably copper. A dilution is recommended in this case.