Abstract This paper reports on a new method for sensitive and selective determination of iodide based on dynamic gas extraction with air flow and digital colorimetric detection using paper modified with silver triangular nanoplates (AgTNPs). Iodide is oxidized in a sample by Fe(III) to produce molecular iodine which is extracted in air flow and transferred to a sensitive AgTNPs-containing paper layer. Interaction of AgTNPs with iodine results in optical changes which can be monitored by ordinary scanner. The high selectivity of dynamic gas extraction to volatile compounds ensures successful analysis of such samples as cranberry and kelp with no sample pretreatment, and due to the sensitivity of AgTNPs good analytical performance can be achieved. The limit of detection of iodide was found to be of 0.01 mg L−1 and the determination range of 0.03–0.3 mg L−1. The method can be easily adapted to simultaneous determination of iodide/iodine and iodide/chloride in the same sample.

中文翻译：

---

基于银三角纳米片改性纸动态抽气比色检测碘化物的测定

摘要 本文报告了一种基于气流动态气体提取和使用银三角纳米板 (AgTNPs) 改性纸进行数字比色检测的灵敏和选择性测定碘化物的新方法。碘化物在样品中被 Fe(III) 氧化，产生分子碘，在气流中提取并转移到敏感的含 AgTNPs 的纸层。AgTNPs 与碘的相互作用导致光学变化，可以通过普通扫描仪进行监测。动态气体萃取对挥发性化合物的高选择性确保在没有样品预处理的情况下成功分析蔓越莓和海带等样品，并且由于 AgTNP 的灵敏度，可以获得良好的分析性能。发现碘化物的检测限为 0.01 mg L-1，测定范围为 0.03–0。3 毫克 L-1。该方法可轻松适用于同时测定同一样品中的碘化物/碘和碘化物/氯化物。