【摘要】 <正> 近年来报道了一种将螯合基团接到纤维素滤纸上而制得螯合滤纸,用来预浓缩各种水样中ppb数量级的过渡金属离子。本文报道的将二乙三胺（DEN）接到定性滤纸上制成DEN滤纸。由于二乙三胺与Cu²⁺、Cd²⁺、Pb²⁺、Co²⁺、Ni²⁺等形成的螯合物有较大的稳定常数而不与碱金属和碱土金属生成稳定的螯合物,分子结构稳定,容易固定到纤维素滤纸上,因此制得的DEN滤纸具有良好的性能。只须通过简单的过滤手续,便可从各种水样中预浓缩痕量更多还原

【Abstract】 The preparation and characterization of a chelating cellulose filter are described with 2, 2′—diaminpdiethylamine（DEN）as a functional group. This chelating filter is used in preconcentration of trace transition metal cations from various aqueous samples. It exhibits high selectivity. The collection yield above 96% are obtained for Cu²⁺, Cd²⁺, Pb²⁺, Co²⁺ and Ni²⁺ at pH 6—7 with filtration velocities up to 1. 5 ml/min. cm². It does not chelate alkali and alkaline earth ions. This chelating filter is used simply and keeps service going long. The precision of enrichments is 6% or better.更多还原