A new simple, highly sensitive and selective spectrofluorimetric method for the speciation of thallium at pico-trace levels in various complex matrices using <i>N</i>-(pyridin-2-yl)-quinoline-2-carbothioamide
作者:Mohammed Jamaluddin Ahmed、Muhammad Lajin Mia
DOI:10.1039/d1ra05388d
日期:——
detection limit of 0.16 ng L−1. The quantification limit of the reaction system was 1.6 ng L−1 and the RSD was 0–2%. A large excess of over 80 cations, anions, and complexing agents (such as chloride, phosphate, azide, tartrate, oxalate, and SCN−) do not interfere in the determination. The developed method was successfully used in the determination of thallium in several Standard Reference Materials (SRM)
一种非常简单且非萃取的新型荧光光谱法,用于单独测定 Tl I和 Tl III ,以及使用N- (pyridin-2-yl)-quinoline-2-carbothioamide (PQCTA)测定皮痕水平的两种分析物的混合物已经被开发出来。PQCTA 在微酸性(0.0025-0.05 MH 2 SO 4)溶液中与 Tl III在 20% 乙醇中发生反应,并在水溶液中自身氧化生成高荧光氧化产物,其激发和发射波长为λ ex = 324 nm和λ em = 379 nm,分别。Tl I的测定是基于通过溴水加热 15 分钟快速氧化该离子,同时形成荧光 Tl III -PQCTA。测量由 Tl I和 Tl III之和引起的荧光,并根据荧光值的差异确定Tl I。在 2 分钟到 24 小时之间观察到恒定和最大荧光强度。获得了 0.001–600 μg L -1的 Tl 的线性校准图,提供了 0.16 ng