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

□ XIA Changbin and HUANG Niandong

　　Abstract: Trace V(V) catalyzes mightily file decolorization reaction of arsenazo HI (AsA Ⅲ) by oxidizing with H202 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 spectrophotometfic 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-1Beer's law is obeyed for V(V) in the range of 0.00-0.20 mg.L^-1The 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.
　　Key words: analytical chemistry; vanadium; fly ash; coal gangue; catalytic spectrophotometry; arsenazoⅢ

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原版页码：10,11,12,13,14原版全文