活性炭柱吸附富集-分光光度法测定饮用水中痕量钼(Ⅵ)

Determination of Mo(Ⅵ) in water by preconcentration spectroscopy with active carbon column

提出了一种预富集水中痕量钼(VI)的新方法,研究了影响Mo α 安息香肟螯合物定量吸附于活性炭柱上的参数,找出了最佳吸附解吸时的条件。该方法避免了用活性炭作为吸附材料的常规方法中,活性炭只能使用一次的间歇式操作,以及用浓硝酸解吸这种费时污染大的解吸方法,同时用NaOH解吸时,大部分金属离子以氢氧化物沉淀的形式留在活性炭上,减少了干扰。该法已用于测定水中痕量钼(Ⅵ),加标回收率达到94.6%～101.4%,RSD3.6%～8.6%。

A procedure for separation and preconcentration of trace amounts of molybdenum in natural water samples by using an active carbon column was proposed. The complex of molybdenum(Ⅵ) ions with α-benzoic oxime was adsorbed onto active carbon. Parameters, such as pH effect on the complexation and adsorption, α-benzoic oxime amount, adsorption time, mass of activated carbon, flow rate, effect of other ions, were studied. The Mo(Ⅵ) complex was then determined by spectroscopy at 530 nm. The method was used to determine trace amounts of Mo in water samples with satisfactory results.