K+存在时,富含鸟嘌呤(Guanine)的特定序列单链DNA会发生构象变化形成G-四联体结构,从而能够与氯化血红素(hemin)结合生成具有过氧化物酶活性的模拟酶,对鲁米诺-H2O2化学发光体系具有强的催化作用.据此,提出了利用G-四联体-hemin-鲁米诺-H2O2化学发光体系测定K+的新方法.探讨了DNA浓度,hemin浓度,反应时间及干扰离子对化学发光体系的影响,在优化的实验条件下,对K+检测的线性范围为2.8×10-5～1.5×10-4mol/L,检出限(3σ,n=11)为9.0×10-6mol/L.本方法用于环境水样中K+检测,结果良好.
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