分光光度法和电感耦合等离子体质谱法测定粉条中铝含量的结果比较

Comparison of the results of aluminum content in starch noodles by spectrophotometry and inductively coupled plasma mass spectrometry

中文关键词:  分光光度法  电感耦合等离子体质谱法  粉条  铝

英文关键词:spectrophotometry  inductively coupled plasma mass spectrometry  starch noodles  aluminium

中文摘要:

      目的 对比分光光度法和电感耦合等离子体质谱法(inductively coupled plasma mass spectrometry, ICP-MS)测定粉条中铝含量的结果差异。方法 选取5批次市售的粉条样品, 经微波消解进行前处理后, 分别采用分光光度法和ICP-MS法检测样品中的铝含量, 从方法的线性范围、检出限、定量限、精密度和回收率几个方面对2种方法进行比较分析。结果 2种方法均能有效测定粉条中的铝含量, ICP-MS法的线性范围、检出限、精密度和回收率均优于分光光度法。结论 分光光度法作为国标检测方法, 可满足基层实验室日常检验工作的需要; ICP-MS法更适合于大批量样品快速检测, 尤其是低含量和含量在最大残留限量值附近的样品检测。实验室可根据设备条件、具体任务量、客户需求等选择合适的检测方法。

英文摘要:

      Objective To compare the results of determination of aluminum content in starch noodles by spectrophotometry and inductively coupled plasma mass spectrometry (ICP-MS). Methods 5 batches of commercial starch noodles samples were selected. After microwave digestion and pretreatment, the aluminum content in the samples were detected by spectrophotometry and ICP-MS. The 2 kinds of methods were compared and analyzed from the aspects of linear range, detection limit, quantitation limit, precision and recovery rate of the methods. Results Both methods could be used for the effective determination of aluminum in starch noodles. The linear ranges, limits of detection, precision and recoveries of ICP-MS method were better than those of spectrophotometry. Conclusion Spectrophotometry, as a national standard detection method, can meet the needs of daily inspection work in grass-roots laboratories. ICP-MS is more suitable for rapid detection of large quantities of samples, especially those with low content and content near the maximum residue limit. Laboratories can choose appropriate testing methods according to equipment conditions, specific tasks and customer requirements.