Rastegarzadeh Saadat, Pourreza Nahid, Saeedi Iman
Department of Chemistry, College of Science, Shahid Chamran University, Ahvaz, Iran.
Talanta. 2009 Jan 15;77(3):1032-6. doi: 10.1016/j.talanta.2008.08.002. Epub 2008 Aug 20.
A novel optical sensor based on a redox reaction for the determination of iodide has been developed. The optode membrane is constructed by immobilization of methyltrioctylammonium chloride on triacetylcellulose polymer. The exchange of chloride as counter ion with iodate in the membrane changes the color to yellow, when it is placed in acidic solution of iodide. The sensor can readily be regenerated by 0.1 mol L(-1) NaOH in less than 15s. The optode has a linear range of 3.94 x 10(-6) to 5.51 x 10(-5)mol L(-1) of iodide ions with a limit of detection 7.44 x 10(-7)mol L(-1). The relative standard deviation for eight replicate measurements of 3.94 x 10(-6) and 1.57 x 10(-5)mol L(-1) of iodide was 2.83 and 1.38%, respectively. The sensor was successfully applied to the determination of iodide in tablet, powdered milk and urine samples.
一种基于氧化还原反应的新型碘离子光学传感器已被开发出来。光极膜是通过将甲基三辛基氯化铵固定在三乙酰纤维素聚合物上构建而成的。当将其置于碘离子酸性溶液中时，膜中作为抗衡离子的氯离子与碘酸盐发生交换，颜色变为黄色。该传感器能用0.1 mol L(-1) NaOH在不到15秒的时间内轻松再生。该光极对碘离子的线性范围为3.94×10(-6)至5.51×10(-5)mol L(-1)，检测限为7.44×10(-7)mol L(-1)。对3.94×10(-6)和1.57×10(-5)mol L(-1)碘离子进行八次重复测量的相对标准偏差分别为2.83%和1.38%。该传感器已成功应用于片剂、奶粉和尿液样品中碘离子的测定。
