染料-示波计时电位法测定天然水中的不同形态铝

Determination of Aluminum Species in Natural Waters by an a.c. Adsorptive Oscillopolarography

采用槲皮素和 8 羟基喹啉 5 磺酸染料 示波吸附计时电位法分别在酸性和碱性条件下快速检测天然水中的无机单核铝 (Ali)和总单核铝 (Ala)浓度。在酸性溶液中测定的是无机单核铝 ,而在碱性溶液中则是总单核铝 (包括无机单核铝和有机单核铝 2部分 ) ,据此可以实现对 5种铝形态的电化学区分测定。实际水样的测定结果与Driscoll方法所得结果基本一致。

A simple and reliable electroanalytical method is described for the fast determination of aluminum species(total Al T, acid soluble Al r, monomeric Al a, inorganic monomeric Al i, organic monomeric Al o) in natural waters by an a.c. oscillopolarography using quercetin(Qu) and 8-hydroxyquinoline-5-sulfonic acid (8-HQS) as complexing adsorbents. In alkaline buffer solution (pH=8.0), 8-HQS was used to determine the total monomeric aluminum, and in acidified buffer solution (pH=5.0), Qu was used to detect the inorganic monomeric aluminum, respectively. This method has been successfully applied in the analysis of Al species in over 10 natural water samples. The results were in good agreement with those obtained by Driscoll′s method. SPE program was used to elaborate on the theoretical foundation of the proposed method.