催化光度法测定化探样品中的痕量钯

本文对催化（Ce^＋4～Hg2^＋2体系）光度法测定钯的测定条件进行了实验和探讨。实验发现，在文献的基础上，改变试剂的加入顺序（先加Ce^＋4、后加Hg2^＋2），延长催化反应时间到60min，可使该体系的检测下限降到0．18ng／g，因此，本文制定的分析方法可满足新地球化学研究对钯的测定要求（要求测定下限为0．2ng／g）用本文所制定的方法对含钯为：0．26、2．3、4．6、60．0ng／g的标样分别进行9次测定、其测定结果与标准值相符，相对标准偏差分别为：11．7％、10．4％、7．8％、4．8％。

Determination of trace palladium in geochemical exploration samples by catalytic spectrophotometry

In this paper, the authors tested and discussed the determination conditions for palladium by catalytic （in Ce^＋4--Hg2^＋2ystem） spectrophotometry. The result shows that the detection limit of system can reduced to 0. 18ng/g by changing the adding reagents order （add Ce first, latter Hg） and extending the reaction time to 60min based on the literature 2. Therefore, the analysis method formulated hy this paper can meet the demands of the new geochemical studies on the determination of palladium （Detection limit requirement is 0. 2ng/g）. Palladium-containing of 0. 26,2.3,4. 6,60. 0 ng/g standard samples were determined for nine times respectively. The determination results are accord with standard values. The relative standard deviations were 11.7%, 10. 4%, 7.8%, 4.8%.