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我厂铸铝中含8～10%硅,1～2%铜,0.3～0.65%镁,0.1～0.3%锆。分析锆有磷酸盐重量法、偶氮胂Ⅲ、茜素磺酸钠比色法等。二甲酚橙在pH<6时能和多种金属离子生成红色络合物,有资料介绍可用于钢中锆的测定。为了使二甲酚橙比色法适用于铸铝中路的分析,我们进行了一些条件试验,选择了较简便的溶样法,并指出在用比色法分析锆时最好不应有SO_4~(2-)存在。试剂及仪器: 标准嗜溶液:称0.070克氯氧化锆,用1:4盐酸溶解,于量瓶中用1:4盐酸稀释至100毫升。吸取10毫升溶液于100毫升量瓶中,加40毫升1:4盐酸,用水稀至刻度,摇匀(每毫升约含锆0.02毫克,其准确含量用磷酸盐重量法标定)。抗坏血酸溶液:5%,当天配制使用。 72型分光光度计。
I plant aluminum containing 8 to 10% of silicon, 1 to 2% copper, 0.3 to 0.65% magnesium, 0.1 to 0.3% zirconium. Analysis of zirconium phosphate gravimetric method, arsenazo Ⅲ, alizarin sulfonate colorimetric method. Xylenol orange at pH <6 and a variety of metal ions can generate red complexes, there are information on the available for the determination of zirconium in steel. In order to make xylenol orange colorimetric method suitable for the analysis of cast aluminum road, we carried out a number of conditions, the choice of a simple solution method and pointed out that the colorimetric analysis of zirconium should not have SO_4 ~ (2-) exists. Reagents and equipment: Standard addictive solution: Weigh 0.070 g of zirconium oxychloride dissolved in 1: 4 hydrochloric acid and dilute to 100 ml with 1: 4 hydrochloric acid in a measuring flask. Pipette 10 ml of solution in a 100 ml volumetric flask, add 40 ml of 1: 4 hydrochloric acid, dilute to the mark with water and shake well (approximately 0.02 mg per milliliter of zirconium, accurate to the phosphate content). Ascorbic acid solution: 5%, formulated for use on the day. 72 spectrophotometer.