Abstract
Synergistic effect of pyridine(py) on the extraction of manganese(II) with 2-thenoyltrifluoroacetone(TTA) was found to be attributable to the formation of an adduct, Mn T2py2. Using the extractability of this adduct into organic phase, a spectrophotometric method for separation and determination of manganese(II) was established.
The pH of a sample solution containing 20 to 800 μg of Mn(II) was adjusted to about 5. After the addition of pyridine and TTA-benzene solution, manganese was extracted into benzene and the absorbance of the organic phase was measured at 430 mμ. The sensitivity of this method corresponding to an absorbance of 0.01 was 2 ppm of Mn(II) in the organic phase. Interference from chromium (III) and copper(II) could be eliminated by converting them into phosphate and cuprous iodide, respectively. The method was applied to the analysis of manganese(0.22%) in steel samples.
