Abstract A novel simple and sensitive on-line flow injection (FI) fabric fiber sorbent extraction (FFSE) system adapted to flame atomic absorption spectrometry (FAAS) for automatic trace metal determination has been established. The FFSE platform is based on polyester fabric fibers coated with sol-gel poly-dimethylsiloxane (PDMS) packed into a microcolumn as sorbent packing material. The potentials of this new scheme were assessed for direct Pb(II) and Cd(II) determination in energy and soft drink samples. The on-line retention of target analytes on sol-gel coated fibers was carried out with sodium diethyl dithiocarbamate (DDTC), while elution was performed with methyl isobutyl ketone (MIBK). The effect of the main chemical and flow parameters on the sensitivity of the method was thoroughly studied. For a loading time of 90 s with a sampling frequency of 30 h− 1, enhancement factors of 167 and 40 and detection limits (3σ) of 1.6 and 0.3 μg L− 1 were obtained for Pb(II) and Cd(II) determination, respectively. The trueness of the developed method was estimated by analyzing a certified reference material and spiked tap water.

中文翻译：

---

用原子吸收光谱法在线测定有毒金属的织物纤维吸附剂萃取：测定能量饮料和软饮料中的铅和镉

摘要 建立了一种适用于火焰原子吸收光谱法(FAAS) 自动测定痕量金属的新型简单灵敏的在线流动注射(FI) 织物纤维吸附剂萃取(FFSE) 系统。FFSE 平台基于涂有溶胶-凝胶聚二甲基硅氧烷 (PDMS) 的聚酯织物纤维，作为吸附剂填充材料填充到微柱中。评估了这种新方案在能量和软饮料样品中直接测定 Pb(II) 和 Cd(II) 的潜力。使用二乙基二硫代氨基甲酸钠 (DDTC) 对溶胶-凝胶涂层纤维上的目标分析物进行在线保留，而用甲基异丁基酮 (MIBK) 进行洗脱。彻底研究了主要化学和流动参数对方法灵敏度的影响。对于 90 s 的加载时间和 30 h− 1 的采样频率，Pb(II) 和 Cd(II) 测定获得了 167 和 40 的增强因子和 1.6 和 0.3 μg L−1 的检测限 (3σ) ， 分别。通过分析有证标准物质和加标自来水来评估所开发方法的真实性。