铸铁和铸钢中稀土总量的快速测定  

Quick Determination of Total Rare Earth Content in Cast Iron and Steel

作　　者：佟晶涛 侯振生 孟君[1] 张继波[1] 聂爽[1] 

机构地区：[1]沈阳机床银丰铸造有限公司,辽宁沈阳110200

出　　处：《铸造工程》2014年第6期7-10,共4页Foundry Engineering

摘　　要：通过试验确定了溶样酸、过硫酸铵、草酸、偶氮氯膦Ⅲ等试剂的最佳用量,分析了波长、显色液放置时间以及共存离子的影响,对操作过程中的一些注意事项进行了说明.结果表明：不分离基体而直接溶解试样后显色,测定铸铁和铸钢中稀土总量的分光光度法快速、简便、准确.样品的加标回收率97.0％～ 101.0％,相对标准偏差（n=5）1.52％.The optimum volume of acid dissolving sample, ammonium persulfate, oxalic acid and chlorophosphonazo III were determined by test. The effects of wavelength, working time of developing solution and coexisting ions were analyzed, and some considerations in operation process were explained. The results show that the spectrophotometry to test total rare earth in cast iron and steel, which is no separation sample and the coloration after dissolving directly, is rapid, simple and accurate. The standard addition recovery of samples is from 97.0% to 101.0%, and the relative standard deviation （n=5） is 1.52%.

关 键 词：分光光度法 稀土 铸铁 铸钢 

分 类 号：TG115.3[金属学及工艺—物理冶金]