光纤激光诱导击穿光谱技术快速检测铝质食品包装中铬含量

Rapid determination of chromium in aluminum food packaging by fiber laser induced breakdown spectroscopy

中文关键词:  光纤激光器  激光诱导击穿光谱  铝制食品包装  快速检测  铬

英文关键词:fiber laser  laser induced breakdown spectroscopy  aluminum food package  rapid detection  chromium

中文摘要:

      目的 建立基于光纤激光诱导击穿光谱技术快速检测铝质食品包装中铬含量的检测方法。方法 使用标准物质分别评估经激光脉宽、能量和扣基线优化后的激光诱导击穿光谱法及火焰原子吸收光谱法的灵敏度和检出限, 并将两种技术应用于市售铝制食品包装样品的检测中, 将相应结果进行对比。结果 激光诱导击穿光谱法耗时2 min, 检出限5.7 μg/g, 可口可乐、铝箔纸和铝盒中铬含量的检出结果为45、22、21 μg/g; 原子吸收分光光度法耗时4 h, 检出限7.2 μg/g, 3种样本的检测结果分别为136、16、14 μg/g。结论 本方法在分析速度、检出限、成本上均优于传统火焰原子吸收光谱法, 且实际样本检测结果与火焰原子吸收光谱法接近, 证明了本方法的可靠性, 有望应用于短时间内大量样本的检测任务。

英文摘要:

      Objective To establish a method for rapid determination of chromium content in aluminum food packaging based on fiber laser induced breakdown spectroscopy. Methods The sensitivity and limit of detection of laser induced breakdown spectroscopy and flame atomic absorption spectrometry optimized by laser pulse width, energy and baseline were evaluated with reference materials, and the 2 kinds of techniques were applied to the detection of aluminum food packaging samples, and the corresponding results were compared. Results For fiber laser induced breakdown spectroscopy, the time consumption was 2 min, the limit of detection was 5.2 μg/g, and the detected Cr content of coca cola packaging, aluminum foil paper and aluminum box were 45, 22, 21 μg/g, respectively. For flame atomic absorption spectrometry, the time consumption was 4 h, limit of detection was 7.2 μg/g, and the detected Cr content of these 3 samples were 136, 16, 14 μg/g, respectively. Conclusion This method is superior to the conventional flame atomic absorption spectrometry method in terms of analyzing speed, limit of detection and cost, and its detection results of commercial samples are similar to those of flame atomic absorption spectrometry, which proves the reliability of this method and its potential applicability in analysis tasks of limited time and large sample quantity.