DOE Chemical IndustryApplication

The bottom line:

Experimenters learned how to correct an Aluminum analysis for fluoride interference.  The accurate concentration of aluminum in water and wastewater by the Eriochrome Cyanine R method is now possible. 

The project:

Fluoride interferred with the standard method for analyzing aluminum in water and wastewater.  The magnitude of this effect was not known.

Experimenters used an I-Optimal design with aluminum levels from 0 to 0.5 mg/L and fluoride levels from 0 to 1.75 mg/L .  The concentration of aluminum in the water was measured by the Eriochrome Cyanine R technique. 

The experimenters showed that the strong interaction between aluminum and fluoride was more important than the presence of fluoride itself.  This information allowed them to correct for the interference.