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根据文献,铜与5-Br-PADAP于pH3～6显色反应,生成紫红色络合物不被乙酸丁酯萃取而镍、锌络合物能被萃取的特性,用来测定钢中铜。基体元素铁的影响,采用氟化钠加以消除。分别作了钢中锰、铬、镍等常见元素对测定铜的干扰试验,从而提供一种灵敏,准确的分析方法。一试剂铜标准溶液:0.1mg·ml~(-1),称取0.1000克纯铜,加入硝酸(1+1)10毫升溶解,煮沸赶尽氮的氧化物,冷却后移入1000毫升量瓶中稀释,摇匀。再取溶液稀释成2μg·ml~(-1)。 2-[(5-溴-2-吡啶)偶氮]-5-(二乙胺)苯酚(简称5-Br-PADAP):0.02%乙醇溶液。乙酸-乙酸钠缓冲液:pH3.7,1M的乙酸与1M
According to the literature, copper and 5-Br-PADAP color reaction at pH3 ~ 6, generating fuchsine complex is not butyl acetate extraction and nickel, zinc complexes can be extracted characteristics for the determination of copper in steel. The impact of matrix elements of iron, sodium fluoride to be eliminated. Respectively, made of steel manganese, chromium, nickel and other common elements on the determination of copper interference test to provide a sensitive and accurate analytical method. A reagent copper standard solution: 0.1mg · ml -1, weighed 0.1000 g of pure copper, dissolved in 10 ml of nitric acid (1 + 1), boiled and rinsed with nitrogen oxide, cooled and transferred to a 1000 ml measuring flask Dilute, shake well. Then take the solution diluted to 2μg · ml ~ (-1). 2 - [(5-Bromo-2-pyridyl) azo] -5- (diethylamine) phenol (abbreviated as 5-Br-PADAP): 0.02% ethanol solution. Acetic acid-sodium acetate buffer: pH 3.7, 1M acetic acid and 1M