钛氧化物中微量镁的萃取-分光光度测定

Extraction Spectrophotometric Determination of Magnesium in Titanium Oxide

研究了用５，７－二碘－８－羟基喹啉和罗丹明６Ｇ萃取－分光光度法测定分析纯二氧化钛和自制高纯三氧化二钛中微量镁的含量。待测样品在硫酸和硫酸铵作用下溶解为硫酸钛；而其中含有的镁则转化为硫酸镁。在微碱性溶液（ｐＨ＝ ９．０）中与５，７－二碘－８－羟基喹啉及罗丹明６Ｇ反应生成（Ｒｈ６Ｇ）＋ ［Ｍｇ（ＯｘＩ２）３］－ ，用甲苯萃取。以相同实验条件下未加样品的萃取有机相为空白参比，在５４６ ｎｍ 下测定其吸光度。由于微量镁的分析影响因素较多，不易测准。我们增加了过滤钛、降温等措施，使测量精度大大提高。

A method concering determination of trace magnesium in titanium oxide (TiO 2 and Ti 2O 3) is investigated. The titanium oxide is changed into titanium sulfate in reaction with sulphuric acid and ammonium sulfate, and the magnesium into its sulfate simultaneously. Then ionic associate (Rh6G) +[Mg(O xI 2) 3] - is formed in a rhodamine 6G/5,7 diiodo 8 quinolinol system at pH=9.0 after extraction with toluene. The transparency of organic phase is determined at a wave length of 546 nm. A series of strict steps are adopted to improve the results.