Utilization of iodide as a perchlorate-laden resin regenerating solution and isolation of perchlorate from simulated ground water samples

摘要

The selective ion exchange of perchlorate from simulated groundwater samples using the bifunctional Purolite A-530E resin was performed.Regeneration of the resin is difficult due to the relatively hydrophobic nature and high selectivity of perchlorate over the most common ions.Use of the tetrachloroiron(III)complex in 2 M or higher hydrochloric acid solutions as a regenerant and displacer of perchlorate can be problematic if one wishes to recover the perchlorate and/or use stainless steel columns,fittings,and HPLC-type pumps.0.1 M sodium iodide was investigated as an alternative to FeCl_4~-to circumvent these problems.Regeneration efficiencies in between those of FeCl_4~-and Cl~-were observed.During elution a peak fraction of 0.068 M NaClO4 in 0.1M NaI was obtained.Pure KClO4 was then precipitated by addition of KC1 and methanol to this fraction.