【摘要】 系统地研究了 Mn( ) -1 -( 2 -吡啶偶氮 ) -2 -萘酚 ( PAN)在石蜡相中的显色反应。在 NH3-NH4Cl( p H=1 0 .0 )缓冲介质中 ,此有色络合物能定量被石蜡萃取 ,锰量在 0～ 1 0μg/30 m L范围内符合比耳定律 ,建立了测量锰的新型固相分光光度法。方法的检出限为1 .6× 1 0 - 9g/m L。应用于茶叶中痕量锰的分析 ,结果良好。更多还原

【Abstract】 Mn (Ⅱ) with 1 (2 pyridylazo) 2 naphthol colour reaction in paraffin phase has been studied. In the medium of NH 3 NH 4Cl (pH=10.0), the coloured complex can be quantitatively extracted with paraffin. Beer’s law is obeyed in the range of 0~10 μg/30 mL of Mn (Ⅱ). The detection limit is 1.6×10 -9 g/mL. The method can be used for the determination of Mn(Ⅱ) in tea samples with satisfactory results.更多还原