停流流动注射-诱导动力学光度法同时测定微量铁和锑

依据诱导反应的基本原理, 提出了一种同时测定多元素的方法; 研究了Fe(II)、Sb(III)诱导的Cr(VI)-I^-氧化还原反应体系, 并据此建立了停流-诱导动力学光度法同时测定微量铁和锑的工作条件。线性范围分别为0~1.2μg.mL^-1Fe(II)和0~2.0μg.mL^-1Sb(III); 检测限为0.012μg/mL^-1Fe(II)和0.014μg.mL^-1Sb(III)。除Ti(III)、V(IV)及As(III)外, 其余共存离子不影响测定。用本法测定了锌标准物及模拟样品中的铁和锑含量, 结果满意。

A stopped-flow inductive kinetic spectrophotometric method for simultaneous determination of iron and antimony

A stopped-flow inductive kinetic spectrophotometric method for the simultaneous determination of iron and antimony was proposed. The principle of determination was discussed, and a procedure for simultaneous determination of Fe(II) and Sb(III) was established based on the inductive effect of them on the chromium (VI)-iodide redox reaction. The ealibration graphs were linear for 0~1.2μg.mL^-1Fe(II) and 0~2.0μg.mL^-1Sb(III) respectively, and the detection limits were 0.012 μg.mL^-1Fe(II) and 0.014μg.mL^-1Sb(III). The method was used for the determination of iron and antimony in zinc metal standard and simulated sample, and the results are satisfactory.