US EPA

2071590 

Journal Article 

Spectrophotometric Determination of Copper and Iron Subsequent to the Simultaneous Extraction of bis(2,9-Dimethyl-1,10- phenanthroline)copper(I) and bis(2,4,6-Tri(2-pyridyl)-1,3,5 -triazine)iron(II) into Propylene.. 

Stephens, BG; Felkel HL Jr; Spinelli, WM 

1974 

Yes 

Analytical Chemistry
ISSN: 0003-2700
EISSN: 1520-6882 

NIOSH/00045128 

46 

6 

692-696 

As a result of studies to find simple and reliable analytical methods for the determination of copper (7440508) and iron (7439896) it has been found that propylene carbonate (4-methyl-1,3-dioxolane-2-one) (108327) simultaneously extracts the 2,9-dimethyl-1,10-phenanthroline (neocuproine; NC) chelate of copper(I) and the tri(2-pyridyl)-1,3,5-triazine (TPTZ) chelate of iron(II) from acetate-buffered aqueous solutions. Molecular absorption spectrophotometric quantification is accomplished by measuring the absorbance of the iron(II)-TPTZ chelate at 596 nm and that of the copper(I)-NC chelate at 458 nm. The copper(I)-NC chelate does not absorb at 596 nm and consequently copper does not interfere with the determination of iron. The iron(II)-TPTZ chelate exhibits an absorbance at 458 nm that is 0.123 times its absorbance at 596 nm; therefore, correction for the effect of iron on the determination of copper is straightforward. The development of the method and the results of analyses of sea water, tap water, and aluminum alloy are reported.