水杨基荧光酮-溴代十六烷基三甲基铵分光光度法测定饮用天然矿泉水中的钼

Determination of Molybdenum in Drinking Natural Mineral Water by Spectrophotometry With Salicyfluorone and Cetyltrimethylammonium Bromide

目的 探讨胶束增敏反应测定饮用天然矿泉水中钼的方法。方法 在阳离子表面活性剂溴代十六烷基三甲基铵存在下 ,钼 (VI)与水杨基荧光酮在稀盐酸介质中可以形成红色配合物 ,在 5 2 2 nm处有最大吸收。结果 钼含量在 0～ 5μg/ 10 ml符合比耳定律 ,表观摩尔吸光系数为ε52 2 =1.6 6× 10 5L / (mol· cm ) ,方法的测定下限为 0 .0 2 mg/ L ,相对标准差小于 2 .7% ,回收率为 96 .7%～ 10 5 .8%。该方法用于测定水样中的钼 (VI) ,获得与石墨炉原子吸收法一致的结果。结论 方法准确、灵敏、简便 ,适用于饮用天然矿泉水中钼的测定。

Objective To explore the method for determining molybdemun (Mo) in drinking natural mineral water by micella sensitized colour reaction Mothods In the present of cationic surfactant cetyltrimethyl ammonium bromide,a red colored coordination complex was found due to the interaction of Mo 5+ and salicyfluorone in dilute hydrochloric acid solution and revealed the maximum absorption peak at wavelength of 522 nm Results This reaction obeyed Beer's law in the range of 0~5 μg/10ml Mo 5+ The molar absorptivity,detection limit,relative standard deviation and recovery rate were 1 66×10 5 L/(mol·cm),0 02 mg/L,<2 7%,96 7%~103 1% respectively No significant differences were observed in the levels of Mo 5+ in water samples obtained by this method and graphite furnance atomic absorption spectrophotometry Conclusion This method was accurate,sensitive and simple for determination of Mo 5+ in drinking natural mineral water