摘要
为测定铍铜中间合金中铝的含量,使用硝酸溶解试样,用氨水调节至pH 6～7,使铁、铝以氢氧化物形式沉淀,过滤并洗涤使其与基体铜分离。采用盐酸溶解沉淀,在pH 5.0的乙酸-乙酸钠缓冲溶液中,铝与8-羟基喹啉形成络合物,采用三氯甲烷萃取,络合物最大吸收波长位于393nm处,表观摩尔吸光系数为6.45×103 L.mol-1.cm-1。在三氯甲烷显色溶液中,铝离子的质量浓度在0～4 000μg/L范围内符合比尔定律。铁、铜等干扰元素于显色前使用铜试剂-三氯甲烷萃取分离除去。方法适用于铍铜中间合金中0.000 2%～0.5%铝的测定,结果与ICP-AES法测定结果相符合,样品加标回收率为98%～102%。
The beryllium copper intermediate alloy sample was dissolved by nitric acid to determine the content of aluminum.The pH of solution was adjusted to 6-7 using ammonia water.The iron and aluminum were precipitated in form of hydroxide.After filtration and washing,they were separated from matrix copper.The precipitation was dissolved with hydrochloric acid.In HAc-NaAc buffer solution at pH 5.0,aluminum reacted with 8-hydroxyquinoline to form complex,which was extracted with chloroform.The maximum absorption wavelength of complex was at 393 nm,and the apparent molar absorptivity was 6.45×103 L·mol-1·cm-1.In chloroform coloring solution,the Beer’s law was obeyed for aluminum ion with mass concentration of 0-4 000 μg/L.The interference ions such as iron and copper were removed by cupron-chloroform extraction before coloring.This method was applicable for the determination of 0.000 2 %-0.5 % aluminum in beryllium copper intermediate alloy.The results were consistent with those obtained by ICP-AES.The recoveries of standard addition were 98%-102%.
出处
《冶金分析》
CAS
CSCD
北大核心
2013年第3期60-64,共5页
Metallurgical Analysis
关键词
铍铜中间合金
铝
8-羟基喹啉
分光光度法
beryllium-copper master alloy
aluminum
8-hydroxyquinoline
spectrophotometry
