微量钼Ⅵ的质子化壳聚糖富集和分光光度法测定

Determination of Trace Molybdenum?after Enrichment on Protonated Chitosan

研究了质子化壳聚糖吸附钼 的性能和机理。在弱酸性 (pH 4 .5的NaAc HAc缓冲溶液 )介质中 ,钼 以MoO2 -4形式吸附在质子化的壳聚糖上 ,吸附反应在 2 0min内可达到平衡 ,饱和吸附容量为 18.4mg g。详细研究了影响吸附过程的有关参数 (如介质酸度、吸附速率、吸附容量 )和脱附最佳条件。方法用于水体中微量钼 的富集测定 。

Molybdenum?, as MoO 2- 4, was enriched on protonated chitosan in weak acidic medium and then eluted with a small volume of 1 mol/L ammonia solution(pH 10). The collection mechanism and optimum conditions for the spectrophotometric determination of Mo? have been studied. The method was used to the determination of trace molybdenum? in water with satisfactory result.