The use of microwave digestion method for the determination of chemical forms of sodium and chloride ions in seashell structures

M. Takenaka, M. Ikeda, S. Terada
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引用次数: 4

Abstract

A new method was developed for understanding the distribution of chemical species such as mobile-sodium, total-sodium, mobile-chloride, and total-chloride ions in seashell structures. The microwave digestion method was applied for the dissolution of different chemical species of these elements. Several kinds of solutions were used to separate the various species of sodium and chloride ions. Using this method, the distribution of sodium and chloride ions in seashell structures was revealed to differ markedly. Total-sodium ion concentration seemed to be constant in the different layers. Conversely, total-chloride ion concentration was one order of magnitude less than that of total-sodium ion. Mobile-chloride ion concentration also shows that chloride ion is more mobile than sodium ion.The method is effective in measuring the distribution of the elements of seashell structure whilst preventing their contamination from the surroundings and from the reagents used in the procedure. The detection limits were 5 ng g–1 for sodium, and 20 ng g–1 for chloride ion, respectively.
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用微波消解法测定贝壳结构中钠离子和氯离子的化学形态
建立了一种新的方法来了解贝壳结构中流动钠离子、总钠离子、流动氯离子和总氯离子等化学物质的分布。采用微波消解法对这些元素的不同化学种类进行了溶出。用不同的溶液分离不同种类的钠离子和氯离子。利用这种方法,发现了钠离子和氯离子在贝壳结构中的分布有明显的差异。总钠离子浓度在不同的层中似乎是恒定的。相反,总氯离子浓度比总钠离子浓度低一个数量级。移动氯离子浓度也表明氯离子比钠离子更具移动性。该方法可以有效地测量贝壳结构元素的分布,同时防止它们受到周围环境和过程中使用的试剂的污染。钠和氯离子的检出限分别为5 ng g-1和20 ng g-1。
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