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【求助】硒代硫酸鈉 sodium selenosulfate 應(yīng)如何長(zhǎng)時(shí)間保存? 已有6人參與
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| 看到很多文獻(xiàn)上說sodium selenosulfate (Na2SeSO3)需要在使用時(shí)再制備,不能長(zhǎng)久保存,有沒有清楚長(zhǎng)時(shí)間后會(huì)發(fā)生什么樣的變化?每次實(shí)驗(yàn)需要的量也就1ml左右,但是如此小的量確實(shí)不方便合成,如果每次合成的比較多,對(duì)Se也是種浪費(fèi)。 |
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剛剛在網(wǎng)上查到一點(diǎn)兒資料: Sodium selenosulfate is an unstable inorganic selenium compound, and thus does not have a commercially available product. It was used widely for the preparation of nano-materials containing selenium. For example, sodium selenosulfate was used to prepare nano-sized copper selenide, cadmium selenide, lead selenide and the like. Generally, sodium selenosulfate was prepared by mixing elemental selenium power with sodium sulfite with a molar ratio of 1:3 to 1:6 and refluxing at a temperature of 80-100° C. for 2-4 hours. It is of prime importance for the stable time of the newly generated sodium selenosulfate that the sodium sulfite presents in excess, and the more sodium sulfite presents, the longer the stable time is. In general, the newly generated sodium selenosulfate is used immediately for the preparation of selenium nanomaterials. [ Last edited by dchost on 2010-12-7 at 18:02 ] |
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