By Anil K. Mukherji, R. Belcher and M. Frieser (Auth.)
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4) In presence of thorium and titanium, add 3 g of solid (NH4)aS04 after adding excess EDTA. (5) Arsenic(III), iron(III), mercury(I), molybdenum(VI), nickel(II), and tin(II) interfere. Determination of Zirconium, Thorium, and Titanium in presence of each other Pribil and Vesely(29) report that zirconium, thorium, and titanium can be separated from other elements by precipitation with sodium hydroxide in presence of triethanolamine. The precipitated zirconium hydroxide is in a polymeric form and is not depolymerized by dissolving in nitric acid.
C , / . Amer. Chem. Soc. 53, 921 (1931). SCHUMB, W. C. and PITTMAN, F . , Anal. Chem. 14, 512 (1942). FRESENIUS, W. , Handbuch der Analytischen Chemie, Springer, Berlin, 1950, Part III, Vol. IVb. p p . 170-287. CLASSEN, A. , Rec. Trav. Chim. 61, 103 (1942). HILLEBRAND, W. S. Geol. Survey Bull. N o . 176 (1900). LUNDELL, G. E. F . and KNOWLES, H. , / . Amer. Chem. Soc. 41,1801 (1919). WILLARD, H. H. and HAHN, R. , Anal Chem. 2 1 , 293 (1949). 23. BABKO, A. K. and SHTOKALS, M. , Zavod. Lab. 1A9 674 (1958).
Some find it difficult to detect the appearance of the yellow color. Xylenol orange can be substituted for thiourea for a sharp change in endpoint color from yellow to red. Milner(41) recommends iodide for the detection of end point. Note. (1) Fritz and Johnson<17) recommend addition of 10 ml of 10% ammonium tartrate solution after the addition of excess EDTA in presence of sulfate or phosphate. The rest of the procedure is the same as described above. According to Pilkington and Wilson,(35) sulfate should not interfere.