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研究了新试剂 5- [4- (3- N-甲基麻黄素丙氧基 )苯基 ]- 1 0 ,1 5,2 0 -三 (4-甲氧苯基 )卟啉溴化物与 Cu( )的显色反应 ,试验表明 ,在 p H 4的 HOAc- Na OAc缓冲溶液中 ,沸水浴加热 7min,形成 M∶ R=2∶ 3的络合物 ,λmax=41 8nm,在 0～ 2 0 0μg· L-1范围内吸光度与 Cu( )的浓度符合比耳定律 ,加入乙醇能提高灵敏度 ,ε=4.2× 1 0 5。方法具有灵敏度高及干扰少的特点 ,用于测定水样中痕量 Cu( ) ,结果满意
The new reagent 5- [4- (3-N-methylephedrinepropoxy) phenyl] -1,05,2 0-tris (4-methoxyphenyl) porphyrin bromide was reacted with Cu () Chromogenic reaction, the experiment showed that, in p H 4 HOAc-Na OAc buffer solution, a boiling water bath heated 7min to form M: R = 2: 3 complex, λmax = 41 8nm, The absorbance and Cu () concentration in the range of 0 0μg · L-1 accord with Beer’s law. Adding ethanol can increase the sensitivity, ε = 4.2 × 105. The method has the characteristics of high sensitivity and less interference for the determination of trace amounts of Cu () in water samples with satisfactory results