Perez-Garcia, F; Galan-Vidal, CA; Alvarado-Rodriguez, JG; Paez-Hernandez, ME; Andrade-Lopez, N; Silva, MTR., Selective Liquid-Liquid Extraction of Mercury(II) from Aqueous Solution by N-Alkyldithiophosphate Compounds CH3(CH2)nS2P(OC6H4)2 (n=0 to 4), SEPARATION SCIENCE AND TECHNOLOGY, Año: 2013 Volume: 48 Issue: 5 Pages: 736-740 DOI: 10.1080/01496395.2012.716480 ISSN: 0149-6395
The extraction of mercury(II) from nitric acid solutions by the dithiophosphate compounds CH3(CH2)nS2P(OC6H4)2 (n=0 to 4) has been examined. The best extracting properties were displayed by the liquid compound containing the longest alkyl chain CH3(CH2)4S2P(OC6H4)2 (Pen-DTP) in acidic media. The results indicate the stability of Pen-DTPA in nitric and sulphuric media. Pen-DTP selectively extracted Hg(II) in the presence of some interfering ions such as Cd(II), Pb(II) and Bi(III). The Hg(II) recovery from back-extraction experiments with chloridric acid is higher than 70%. Mostly, this extractant shows a remarkable selectivity in the extraction of mercury (76.6%) in the presence of Ag(I) (9.2%) without using a masking agent.