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二甲苯胺蓝-Ⅱ作为微量镁的显色剂在国内外曾发表过一些研究报告.我们在前人工作的基础上,应用此试剂来测定锡精矿中低量镁.试验表明,在pH10,30%乙醇介质中,试剂与镁定量反应生成酒红色可溶性络合物,最大吸收峰在520纳米处,摩尔吸光系数ε_(510)=2.4×10~(4)升·摩尔~(-1)·厘米~(-1),氧化镁含量在0～12微克/25毫升内符合比尔定律.为消除锡精矿中大量锡及伴生元素的影响,本实验应用碘化铵挥发锡,铜试剂沉淀铁、铅、铜、铋、锰等元素,然后以酒石酸钾钠掩蔽铝,锶—EGTA掩蔽钙.本法适用于国内各类型锡精矿中0.01～1%氧化镁量的测定.
Xylene blue-Ⅱ as a trace amount of magnesium chromogenic reagent at home and abroad have published a number of studies on the basis of our predecessors, the use of this reagent to determine low-grade tin concentrate tin concentrate test showed that at pH10 , 30% ethanol medium, the reagent reacts with magnesium to produce wine red soluble complex with the maximum absorption peak at 520 nm. The molar extinction coefficient ε 510 = 2.4 × 10 ~ (4) l · mol ~ (-1) ) · Cm -1, and Beer’s law is obeyed in the range of 0 ~ 12 μg / 25 ml.In order to eliminate the influence of a large amount of tin and its associated elements in tin concentrate, we used ammonium iodide volatilized tin and copper reagent Precipitation of iron, lead, copper, bismuth, manganese and other elements, and then covered with sodium potassium tartrate aluminum, strontium -EGTA masking calcium .This method is applicable to the determination of various types of domestic tin concentrate 0.01 ~ 1% of the amount of magnesium oxide.