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jeffchanczy

铁杆木虫 (正式写手)

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专业: 古生物学和古生态学

[交流] 求助几个关于钨酸钠的名词

请问：多钨酸钠、聚钨酸钠和偏钨酸钠指的是同一种试剂么？想用来做重液分选，但是Sodium polytungstate（多钨酸钠）只在德国一家公司找到了，国内的都叫Sodium Metatungstate（偏钨酸钠或者聚钨酸钠）。分子式都是3Na2WO4·9WO3·H2O。有点糊涂，求各路大神解释。

搜Sodium polytungstate这个名词的时候找到维基百科上一段解释，顺带附上，也求大神解说一下，不是化学专业的，实在是对化学名词头大，谢谢！

Solid Sodium polytungstate (SPT) are white crystals and liquid SPT (solved in H2O) is a light yellow-green transparent solution. In a form of powder SPT is a 12-fold aggregated isopolytungstate with a molar mass of 2986.12 g/Mol. The structure of polytungstate is modelled using octahedrons in which the oxygen ions are located in the corners and the tungsten ions in the middle of the octahedrons. When represented as a spherical model, the oxygen ions form a dense spherical shell while the tungstate ions fill the open spaces in the octahedra. Because of this structure this substance may be considered a “true” metatungstate, represented structurally as Na6[H2W12O40]. It is known that in “true” metatungstates both of the protons are located in the central empty space of the polyanion and that they are unable to penetrate the external shell of the spherical casing.

[ Last edited by sddtc888 on 2014-4-3 at 20:14 ]

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