Catalytic spectrophotometric determination of trace vanadium in fly ash and coal gangue by Triton X-100 enhancing effect

Trace V(V) catalyzes mightily the decolorization reaction of arsenazo III (AsA III) by oxidizing with H2O2 in a pH 4.0 HAc-NaAc buffer solution, and the addition of Triton X-100 can further increase the sensitivity of the reaction and its catalytic extent is linear with the content of V(V). A catalytic spectrophotometric procedure for determining trace V(V)was developed. The results show that the maximun absorption of the color solution is at 560 nm and the detection limit of the method for V(V) is 0.014 mg(.)L(-1). Beer's law is obeyed for V(V) in the range of 0.00-0.20 mg(.)L(-1). The recoveries are 99.0%-104.6%, and the relative standard deviations (RSD) are 2.7%-3.7%. Combined with ion-exchange resin, the method has been applied to the determination of trace vanadium in fly ash and coal gangue with satisfactory results.