二溴邻硝基苯基荧光酮催化光度法测定粉煤灰中痕量锰

Catalytic spectrophotometric determination of trace manganese in fly ash with 4,5-dibromo-2-nitro-phenyfluorone

研究了在pH 1 0 .0的NH3 ·H2 O NH4Cl缓冲溶液中 ,痕量Mn(Ⅱ )催化过氧化氢氧化二溴邻硝基苯基荧光酮 (DBoN PFO)的显色反应 ,建立了测定痕量锰的催化光度新方法。催化程度与Mn(Ⅱ )量在 0 .0～ 5 0 .0 μg/L范围内呈线性关系 ,方法的检出限为 1 .1× 1 0 -8g/L。

A new catalytic spectrophotometric method for the determination of trace manganese(Ⅱ)has been developed.The method was based on the catalytic effect of manganese(Ⅱ)on the oxidation of 4,5 dibromo 2 nitro phenylfluorone(DBoN PFO)with hydrogen peroxide in NH 3·H 2O NH 4Cl buffer solution at pH 10 0,and the catalytic extent was linear with the concentration of manganese(Ⅱ)in the range of 0.0～50.0μg/L.The results showed that the detection limit of the method was 1.1×10 -8 g/L for manganese(Ⅱ).The method has been applied to the determination of trace manganese in fly ash.