Key University Laboratory on Separation and Analysis in Complex Systems of Liaoning Province, Chemistry Department, College of Chemistry and Life Science, Shenyang Normal University, Shenyang, Liaoning 110034, PR China.
Talanta. 2010 Jan 15;80(3):1234-8. doi: 10.1016/j.talanta.2009.09.015.
Electrochemical solid phase nano-extraction, a novel sample preparation technique, was used for the determination of trace iodide in iodised table salt based on the silver sulfate nanoparticle-modified carbon paste electrode. Electrochemical solid phase nano-extraction was realized in the exchange between the sulfate anion in nanoparticles and an iodide anion from aqueous solution. The released silver cation serves as the electrochemical probe for the determination of iodide. The extraction follows a Freundlich adsorption isotherm, and can be used in the detection of iodide in the concentration range 5.0x10(-12)-4.0x10(-9)M. The amount of iodide in iodised table salt was determined as 0.875+/-0.002microg/g, which is about 2.5% of the addition amount of iodate with a relative deviation of 5.92% and a standard addition recovery of 90-110%. The large amounts of chloride and iodate did not interfere with the detection.
电化学固相纳米萃取是一种新型的样品制备技术，用于在硫酸银纳米粒子修饰的碳糊电极上测定加碘食盐中的痕量碘化物。电化学固相纳米萃取是通过纳米粒子中的硫酸根阴离子与水溶液中的碘化物阴离子之间的交换来实现的。释放出的银阳离子可用作测定碘化物的电化学探针。萃取遵循Freundlich 吸附等温线，可用于检测 5.0x10(-12)-4.0x10(-9)M 浓度范围内的碘化物。加碘食盐中碘化物的含量测定为 0.875+/-0.002μg/g，约为碘酸盐添加量的 2.5%，相对偏差为 5.92%，标准添加回收率为 90-110%。大量的氯离子和碘酸盐不会干扰检测。
