Continuous flow analysis of iron (III) in seawater using a chalcogenide glass ion-selective electrode

Laboratory Robotics and Automation Pub Date : 1999-10-13 DOI:10.1002/(SICI)1098-2728(1999)11:5<284::AID-LRA7>3.0.CO;2-8

Roland De Marco, Bobby Pejcic, Xue Dong Wang

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引用次数: 18

Abstract

Continuous flow analysis (CFA) is suitable for rapid and reliable determination of free Fe^III in organic-free, UV-oxidized seawater when used in conjunction with an extrapolation method that predicts the steady-state potentials of an Fe^III chalcogenide glass ion-selective electrode (ISE) by using initial data associated with a step-wise change in aFe³⁺. It is shown that the CFA technique yields a Nernstian response of a 30 mV per decade change in aFe³⁺ in saline citrate buffers in the range of 10⁻²² to 10⁻¹ M Fe³⁺. Validation of the CFA technique in organic-free, UV-oxidized seawater has demonstrated that the response of the Fe^III ISE is internally consistent with the well-known inorganic speciation equilibria occurring in natural seawater. © 1999 John Wiley & Sons, Inc. Lab Robotics and Automation 11: 284–288, 1999

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用硫系玻璃离子选择电极对海水中铁(III)的连续流动分析

连续流分析(CFA)适用于快速可靠地测定无有机、紫外线氧化海水中的游离FeIII，当与外推法结合使用时，该外推法通过使用与aFe3+逐步变化相关的初始数据来预测FeIII硫系玻璃离子选择电极(ISE)的稳态电位。结果表明，CFA技术在10−22至10−1 M Fe3+范围内的柠檬酸盐缓冲液中，Fe3+的Nernstian响应为每十年变化30 mV。CFA技术在无有机物、紫外线氧化海水中的验证表明，FeIII ISE的响应内部与天然海水中发生的众所周知的无机物种形成平衡一致。©1999 John Wiley &儿子,Inc。实验室机器人控制与自动化，1999

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Laboratory Robotics and Automation

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