Ion-exchange Behaviour of Stannic Tungstophosphate towards Bivalent Metal Ions

Chemistry Department, Delhi College of Engineering, Kaskinere Gate, Delhi-110 006 Chemical Laboratorys, Z. H. College of Engineering and Technology, Aligarh Muslim University, Aligarh-202 001 Manuscript received 19 September 1984, revised 16 August 1985, accepted 29 October 1985 SnIv tungstophosphate (Sn-W-P) was prepared by adding 01 M SnIv chloride solution to 0.1 M tungstophosphoric acid solution in different volume ratios. The dried gel of Sn-W-P was reused in 6 M phosphoric acid for 100 h before breaking down into small granucles. Its ion-exchange capacity, chemical composition (Sn-W-P, 2 : 1 : 3.2), chemical dissolution, pH titration, heat treatment, it spectra and distribution coefficients for 11 bivalent metal ions in various media have been studied. The quantitative separation of ZnII-CdII and HgII-CuIIwere also achieved on its columns