瓦尔登还原器（Walden reductor）是一种银还原柱，它能将水溶液中的金属离子还原成较低价的氧化态。例如:将UO2还原成U，此还原柱由乔治.H.瓦尔登（George H. Walden）与他的博士生赛文.M.爱德蒙斯（Sylvan M. Edmonds）于哥伦比亚大学共同研发。
英语百科
Walden reductor 瓦耳登还原器
The Walden reductor is a reduction column filled with metallic silver
which can be used to reduce a metal ion in aqueous solution to a lower oxidation state. It can be used e.g. to reduce UO2 to U. The method is named after George H. Walden, who developed it jointly with a Ph.D. student, Sylvan M. Edmonds, at Columbia University.