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目的：研究了海南省分布最广、数量最多的三个椰子品种硬壳的微量元素含量并报道了其测定方法。方法：海南产的三种椰子分别是：海南高种（ＣｏｃｏｓｎｕｃｉｆｅｒａＬ．ＶａｒＴａｌ）、黄矮种（Ｃ．Ｌ．ＹｅｌｏｗＤａｆｅ）及吗桂种（Ｃ．Ｌ．Ｍａｗａ）的硬壳，去除残留椰肉等杂质，洗净、烤干、粉碎、恒重，用干法消化后，制成待测液。用ＷＦＸ－１Ｄ原子吸收分光光度计测定。准确度为ｘ±ｓ／１０－６ｇ（μｇ／ｇ）。结果：测定了海南椰子硬壳三个品种的Ｚｎ、Ｃｕ、Ｆｅ、Ｃａ、Ｐｂ、Ｍｇ、Ａｓ、Ｋ、Ｃｄ、Ｎｉ等１０种微量元素含量。其中Ｋ比其它元素高２～３个数量级，对人体有毒害的Ｐｂ和Ｃｄ含量很低。结论：首次报道海南产三种椰子硬壳的１０种微量元素的含量及其测定方法。干式消化法（４００℃，灰化２～３ｈ）适合于消化极坚硬的椰子硬壳。
OBJECTIVE: To study the content of microelements in the hard shells of the three coconut varieties with the most widespread distribution and the largest number in Hainan Province and to report their determination methods. Methods: The three types of coconuts produced in Hainan were: Cocos nucifera L.Var Tal, C. L. Yelow Dafe, and C. L. Mawa crusts, which remove residual coconut meat, etc. Impurities, washed, baked dry, crushed, constant weight, digested with dry method, made into the test solution. Determined with a WFX-1D Atomic Absorption Spectrophotometer. Accuracy is x ± s/10-6g (μg/g). Results: The content of 10 kinds of trace elements such as Zn, Cu, Fe, Ca, Pb, Mg, As, K, Cd, Ni and other three kinds of coconut crust in Hainan was determined. Among them, K is 2-3 orders of magnitude higher than other elements, and the content of Pb and Cd that are toxic to humans is very low. Conclusion: The content and determination method of ten trace elements in three kinds of coconut crust produced in Hainan are reported for the first time. Dry digestion (400°C, ash 2–3h) is suitable for digesting very hard coconut shells.