摘要
研究了在聚乙烯醇存在下,镁(Ⅱ)与碘化钾和罗丹明B形成三元络合物的超高灵敏显色反应.以摩尔比法测定络合物中摩尔比,结果[MgI5]3-与RB的比为1∶3,络合物水溶液的最大吸收波长是556 nm,摩尔吸光系数为1.58×105 L·(mol·cm)-1·Mg含量在0～6μg/mL范围内符合朗伯比耳定律.
Study on the color reaction of Magnesium （Ⅱ）, KI and Rhodamine B in the presence of polyvinyl alcohol. Mg （Ⅱ） ion reacts with KI and Rhodamine B. Molar ratio methods gets Mg ： RB=1 ： 3. λ max of the product is 556nm, the mole of extinction coefficient is 1.58×10^5 L·（mol·cm）^-1. Beer＇ s law is obeyed in the range of 0～6μg/mL. The condition of the color reaction and the interference of foreign ions were studied. Direct determination of trace Mg （ 11 ） in aqueous medium was proposed. The way comparative satisfactory.
出处
《高师理科学刊》
2007年第5期55-57,共3页
Journal of Science of Teachers＇College and University
关键词
镁
罗丹明B
分光光度法
magnesium
Rhodamine B
spectrophotometric method
