锶(Ⅱ)-铁氰酸盐-钙黄绿素体系流动注射-后化学发光法的研究

来源期刊：冶金分析2010年第8期

论文作者：何云华

文章页码：17 - 20

关键词：后化学发光； 铁氰化钾； 钙黄绿素； Sr²⁺

Key words：post-chemiluminescence； potassium ferricyanide； calcein； Sr²⁺

摘    要：用流动注射化学发光分析仪的静态测量系统,研究了Sr²⁺在铁氰化钾-钙黄绿素体系中的后化学发光行为。实验发现:当将碱性铁氰化钾溶液注入到钙黄绿素溶液中,立即发生了一化学发光反应,检测到强的化学发光信号,反应结束后化学发光信号回落至基线,再注入Sr2+标准溶液,又引发一个新的化学发光反应,检测到另一强的化学发光信号,反应结束后化学发光信号又回落至基线。表明了Sr²⁺在铁氰化钾-钙黄绿素化学发光反应体系中发生了后化学发光反应。通过优化反应条件,建立了一种利用后化学发光反应测定Sr²⁺的流动注射化学发光分析法。方法的线性范围为2.0×10^-6~2.0×10^-4 g/mL,检出限为6×10^-7 g/mL,对5.0×10^-5 g/mL的Sr²⁺溶液平行测定11次的相对标准偏差为1.6%。本法已用于工业碳酸锶纯度的测定,测定结果与国标方法相吻合。

Abstract: The post chemiluminescence behavior of Sr²⁺ in potassium ferricyanide-calcein system was studied using the static measurement system of flow injection-chemiluminescent analyzer.The results showed that when the alkaline potassium ferricyanide solution was injected into calcein solution,a first-order chemiluminescence reaction occurred immediately.A strong chemiluminescence signal was detected,which fell to the baseline at the end of reaction.Then,when Sr²⁺ standard solution was injected,another strong chemiluminescence signal was detected,which fell to the baseline at the end of reaction,as well.The results indicated that the post chemiluminescence reaction occurred after Sr²⁺ standard solution was added in potassium ferricyanide-calcein system.By optimizing the reaction conditions,a flow injection-post chemiluminescence method of determing Sr²⁺ was developed.The linear range of the method was 2.0×10^-6-2.0×10^-4 g/mL,and the detection limit was 6×10^-7 g/mL.For 5.0×10^-5 g/mL Sr²⁺ solution,the relative standard deviation(RSD,n=11) was 1.6 %.The proposed method has been applied to the determination of industrial strontium carbonate,and the results were consistent with those obtained by the standard method.