采用电感耦合等离子体质谱仪(inductively coupled plasma mass spectrometry,ICP-MS)对螺旋藻中的铅、镉元素含量进行测定。超声提取法和水浴振荡提取法作为一种可能替代传统的前处理方法与微波消解法进行对比。比较3种前处理方法的准确度、检出限、重复性、加标回收率、分析时间及试剂消耗量等。结果表明,3种方法的测定结果具有较好的一致性,具有良好的准确度和精密度,采用3种方法对国家标准物质(GBW10020,GBW10047)进行处理,铅、镉的测定结果均在参考值范围内。与微波消解法相比较,超声提取法和水浴振荡提取法具有更低的检出限、操作简单、分析处理时间短、用酸量少、节能和环保,适用于螺旋藻中铅、镉元素的快速测定。

The content of elements (lead, cadmium) in Spirulina was determined using inductively coupled plasma mass spectrometry (ICP-MS). Ultrasonic extraction and water bath oscillation extraction were compared by microwave digestion as a possible alternative to conventional pretreatment methods. The three methods were evaluated by comparing the accuracy, detection limit, repeatability, recovery, processing time, the reagent consumption, et al. Analytical results of the three methods showed a good agreement, were found to have satisfactory accuracy and precision. The content of lead and cadmium in national standard material (GBW10020, GBW10047) were in the ranges of reference values by the three methods. Compared with traditional microwave digestion, ultrasonic extraction and water bath oscillation extraction were found to have lower detection limits, are characterized by covenient procedure, less processing time, less reagent consumption, energysaving, and environmentally friendly. Ultrasonic extraction and water bath oscillation extraction are suitable for the rapid determination of lead and cadmium in Spirulina.