二苯硫脲纤维素分离富集-火焰原子吸收法测定地质样品中痕量银

Determination of Trace Silver in Geological Samples by FAAS with Its Preconcentration on Diphenylthiourea Cellulose

在王水介质中，采用二苯硫脲螯合纤维素吸附以除去地质样品中大部分干扰离子，被吸附的银用硫脲溶液解吸并用火焰原子吸收光谱测定。研究了分离和测定的条件，２０余种共存离子对银的测定无显著影响。该法已成功地应用于地质样品中痕量银的测定。

The majority of interfering elements in geological samples can be removed by diphenylthiourea cellulose in aqua regia media.Silver absorbed on the cellulose fibers can then be eluted with a thiourea solution and determined by FAAS.The separation and determination conditions have been studied.More than 20 paragenic elements have no significant influence on the determination of silver.The method has been successfully applied to the determination of trace silver in geological samples.