Simplified synthesis of an 8-hydroxyquinoline chelating resin and a study of trace metal profiles from Jellyfish Lake, Palau

We report a simplified synthesis, and some performance characteristics, for 8-hydroxyquinoline (8-HOQ) covalently bonded to a chemically resistant Tos oHaas TSK vinyl polymer resin. The resin was used to concentrate tract: met als from stored, acidified seawater samples collected from Jellyfish Lake, an anoxic: marine lake in the Palau Islands. The Mn, Fe, and Zn profiles de termined from the 8-HOQ resin extraction were similar to those determined u sing Chelex-100 resin. The Zn and Cd profiles did not exhibit removal by su lfide "stripping" in contrast to other anoxic marine basins. The profiles o f Co and Ni also exhibited elevated concentrations in the anoxic hypolimnio n. The solution speciation and saturation states for the metals were calcul ated using revised metal-bisulfide stability constants. The calculations su ggest that the MS(HS) species dominates the solution speciation for Mn, Co, Ni, Zn, Cd, and Pb. Cu(I) is modeled as the CuS- or Cu(HS)(2)(-) species, while Fe(II) behaves as the: free Fe2+ cation. The Mn, Co, Ni, Cu and Cd co ncentrations appeared to be at least 10-fold undersaturated, while the Fe(I I), Zn, and Pb concentrations were close to saturation with respect to thei r metal sulfides. (C) 2001 Elsevier Science B.V. All rights reserved.