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1 INTRODUCTIONThoughmany powerfulanalyticaltechniqueswereperformedonsodiumaluminatesolution[1~ 4 ] ,theystillhadsomelimitation .X rayd 相似文献
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0绪言60年代初,法国SETARAM公司根据法国化学家E.Calvet教授提出的差式热导式微量热计原理,首先设计制造了卡尔维(CALVET)热检测器及CALVET量热仪,并不断创新改进,将CALVET热检测器及量热仪技术成功地应用于热分析仪中,于so年代制成了先进的TG/DSC-111热分析仪,将热分析的发展及应用推到一个更新更广的阶段。根据国际热分析协会(ICT)的规定:差示扫描量热计(简称DSC)定义为:当待测物质和参考物质,在控制速度的加热或冷却环境下经受相同的变温方式时,建立二者之间的无温差条件需要供给能量;也就是在程序… 相似文献
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聚乙烯醇—丁基罗丹明B分光光度法测定电池及废水中的痕量汞(Ⅱ) 总被引:4,自引:0,他引:4
报道了分光光度法测定痕量汞的一种新方法。在聚乙烯醇存在下 ,汞(II)与硫氰酸盐和丁基罗丹明B形成多元离子缔合物 ,且稳定。在实验条件下 ,在580nm处有最大吸收波长 ,表观摩尔吸光系数为7.08×105L·mol -1·cm -1,Hg(II)在0~6μg/25mL范围内服从比耳定律。通过对几种市售电池及水样中汞含量测定 ,表明体系具有较强的抗干扰能力 ,仅铁(III)、锌(II)干扰汞(II)的测定 ,可加入5 %抗坏血酸和10%柠檬酸掩蔽。该方法具有操作简便、快速、选择性和重现性好的特点 ,适于电池及废水中痕量汞(II)的测定 相似文献
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The preparation of AI(OH)3 by the ion exchange membrane electrolysis followed by the precipitation of sodium aluminate solution with seeds was made. During the process of ion membrane electrolysis, the sodium aluminate solution is rapidly acidified and the caustic ratio (αK) is decreased due to oxygen evolution in the anodic region. And the causticity of solution is increased due to hydrogen evolution in the cathode region, producing the high concentration of caustic soda solution. Regulating the acidity of the anodic solution by controlling the electric quantity in the electrolysis and subsequent decomposing the solution, AI(OH)3 could yield with very large rate and high efficiency. The experiments also indicate that the quality of aluminum hydroxide product is greatly affected by the impurity silicon. 相似文献