流动注射导数光度法测定合金中微量钯

Determination of trace palladium in alloy by flow injection derivative photometry

本文采用了一种新的流动注射导数光度检测技术,应用于测定样品中微量钯的研究,灵敏度高。于Na2CO3-NaHCO3缓冲介质中,显色剂2-羟基-3-羧基-5-磺酸基苯基重氮氨基偶氮苯（HCS-DAA）在Tritonx-100存在下能与Pd（Ⅱ）形成络合比为2∶1螯合物（λm ax=532nm）。一次进样便产生正负两个拐点的导数光度值（ΔA=A正-A负）。表观摩尔吸光系数为1.97×105,线性范围为0~1.2μg.mL-1,进样频率110~120次.h-1,方法用于贵金属合金中微量钯的测定,相对标准偏差（RSD）为1.3%（n=6）,分析结果令人满意。

A new high sensitivity flow injection derivative photometry was applied to determine the trace palladium in alloy.The chromogenic agent HCSDAA and Pd（Ⅱ） complexed a 2∶1 chelate under Tritonx-100 in Na2CO3-NaHCO3 buffer.The photometric quantity of two yielding points were obtained by one sampling（ΔA=Aplus-Aminus）.The apparent molar absorptivity was 1.97×105,the linearity range was 0~1.2μg·mL-1,sampling frequency was 110~100times·h-1,th RSD was 1.3%（n=6）,the results were satisfied.