流动注射－速差动力学研究──分光光度法测定岩矿中痕量锆

Determination of Trace Zirconium in Rocks and Minerals by Flow Injection-Differential Kinetic Spectrophotometry

探讨了以二甲酚橙（ＸＯ）为显色剂时，一些常见金属离子与试剂的显色反应动力学特性，利用Ｚｒ（Ⅳ）和其它金属离子与ＸＯ的反应在动力学上的差异，及Ｚｒ－ＸＯ络合物灵敏的亚稳态，采用流动注射－分光光度联用技术，测定了岩矿中痕量Ｚｒ。方法经ＧＳＲ、ＧＳＳ、ＧＳＤ系列部分地质标准参考物质验证，其结果与推荐值吻合。对含Ｚｒ量为２７２μｇ／ｇ的ＧＳＲ－３进行了５次测定，其ＲＳＤ为２．２％。

he kinetic characteristics of the reaction of some metal ions with xylenol orange have beenstudied.By making use of the difference in kinetics between the reaction of Zr and other metalsand the sensitive metastable Zr-XO complex,a flow injection-spectro photometric technique forthe determination of trace zirconium in rocks and minerals has been developed.The method hasbeen used to the analysis of geological standard reference samples with satisfactory results and therelative standard deviation for GSR-3 containing 272μg/g of zirconium is 2.2%(n=5).