Abstract: To study a suitable method for determining magnesium content in natural rubber, the digested effects of three methods were studied including dry ashing, microwave digestion and graphite digestion. The results showed that three methods could meet the basic requirements. Dry ashing method had little influence on the experimental data. When the concentration of samples was low, the sample size could be appropriately increased. The microwave digestion had simple operation and short detected time. Graphite digestion had not only simple operation but also higher efficiency, so it was convenient for analysing a bulk of samples. Moreover, compared with the other methods, the cost of equipment and consumables of the graphite digestion had the greatest advantages. The graphite digestion was recommended as the more suitable method to measure the content of magnesium in natural rubber.

Key words: natural rubber, digested methods, magnesium content, atomic absorption spectrometry

摘要： 为研究更适合于天然橡胶中镁含量检测的方法，采用干灰化法、微波消解法和石墨消解法三种消解方法研究不同消解条件对天然橡胶中镁含量检测的影响。结果表明，三种消解方法对天然橡胶镁含量的测定均可以满足要求。干灰化法对实验结果影响较小，对低镁含量的样品应适当增加样品量；微波消解法操作简便且检测耗时较短；石墨消解法操作简单，工作效率较高，适用于批量样品分析，设备以及耗材成本与前两种方法相比具有较大优势,为未来我国制定天然橡胶中镁含量的检测标准提供了理论依据。

关键词: 天然橡胶, 消解方法, 镁含量, 原子吸收光谱法