Electrochemiluminescent determination of peroxydisulfate with Cr(bpy)(3)(3+) in purely aqueous solution

A novel method for the sensitive and selective determination of peroxydisul fate was proposed. It was based on an electrochemiluminescent method with C r(bpy)(3)(3+). The applied potential was set at -0.5 V in Cr(bpy)(3)(3+) sy stem which was much more positive than those in Ru(bpz)(3)(2+) and Ru(bpy)( 3)(2+) systems. A linear calibration was obtained over the range of 7-100 m u mol l(-1) with a correlation coefficient of 0.993. The relative standard deviation was 2% for 10 replicate injections of 0.01 mol l(-1) S2O82- solut ion. The detection limit (S/N=3) was 1 mu mol l(-1). The method was success fully applied to determination of peroxydisulfate in phase transfer catalys is. (C) 2000 Elsevier Science B.V. All rights reserved.