Copper analysis in water
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Dear experts, has anyone used the zinc reagent method specified in national standard 13689-2007 to analyze copper in water? When creating the curve, we encountered precipitation upon adding tartaric acid. Has anyone else run into this issue? How should this be resolved? A new position needs to be created, and copper analysis has not been done before. What precautions should be taken when using this method for analysis? If anyone knows the answer, please advise. Thank you
You should first figure out the reason for the precipitation. Many standard test methods include explanations regarding their scope of application; for some samples, it is possible that they are outside this scope of application. In my opinion, the calcium content (hardness) in your circulating water sample is relatively high, and it forms calcium tartrate together with tartrate ions. It seems that your pH control is a bit high.
What is the determination of copper in water? What are the interfering impurities in water? It is necessary to determine what impurities are present in the water; the BCO method is suitable for detecting low concentrations, and its operation is simple.
When we prepare the standard curve using the analysis methods specified in national standards, precipitation in the form of small snowflakes appears after adding tartaric acid; sample analysis has not yet been carried out. Also, when creating curves, materials with a higher copper content exhibit lower absorbance; it’s not clear whether this is due to an insufficient amount of zinc reagent or to the formation of precipitates
Analysis of saturated steam and superheated steam in boilers, as well as copper in feed water