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作者在研究钛的铍试剂Ⅲ四元络合物时发现,铝和铍试剂Ⅲ的反应灵敏,且络合物形成后不被大量的EDTA破坏,本文对此作了进一步探讨,证明铝在pH5.5～6.5的乙酸-乙酸钠缓冲液介质中显色,络合物的吸光度基本一致,其极大吸收波长为555nm,摩尔吸光系数c=2.75×10~4,铝在0～45鹏g/50ml服从比尔定律,络合物的组成为铝:铍试剂Ⅲ=1:2,EDTA存在下至少可稳定2小时,本文以EDTA为掩蔽剂,拟出了锌合金、镁合金中铝的铍试剂Ⅲ光度测定法,并取得了满意的分析结果。 一、主要试剂和仪器 铝标准溶液:准确称取0.1000g高纯铝于200ml烧杯中,用10ml盐酸(1+1)溶解后,再用去离子水定容于1升容量瓶中,此溶液为0.1mg/ml,再取部分溶液配制成5此g/ml的工作溶液;
The study of the titanium beryllium reagent Ⅲ quaternary complex found that the reaction of aluminum and beryllium reagent Ⅲ sensitive, and complex formation is not a lot of EDTA damage, this paper further explores that aluminum in pH5 .5 ~ 6.5 acetic acid - sodium acetate buffer medium color, the absorbance of the complex is basically the same, the maximum absorption wavelength of 555nm, molar extinction coefficient c = 2.75 × 10 ~ 4, aluminum in 0 ~ 45 Peng g / 50ml obey Bill’s law, the composition of the complex is aluminum: beryllium reagent Ⅲ = 1: 2, EDTA can be stable for at least 2 hours in the presence of EDTA. In this paper, EDTA as a masking agent, prepared a zinc alloy, magnesium alloy aluminum beryllium Reagent Ⅲ photometric method, and obtained satisfactory results. First, the main reagents and equipment Aluminum standard solution: Accurately weigh 0.1000g high-purity aluminum in 200ml beaker, dissolved in 10ml hydrochloric acid (1 + 1), and then deionized water in a 1 liter volumetric flask, the solution 0.1mg / ml, and then take part of the solution was formulated into 5 g / ml of the working solution;