砷钼杂多酸分光光度法测定三七中总砷含量

摘要

[目的]获得快速检测三七中总砷的方法.[方法]采用砷钼杂多酸分光光度法测定人工种植三七中的总砷含量,并优化其显色条件.[结果]最佳显色条件:显色剂用量为5.0 ml,显色温度为40℃,显色时间为30 min;AsⅢ标准溶液在浓度为0～0.04 μg/ml时,与吸光度呈良好的线性关系(r=0.996 6);样品中未检测到As.[结论]该方法精密度高,稳定性好,可作为三七中砷含量的检测方法.%[ Objective ] To obtain a rap( )termination method for arsenic from Panax notoginseng ( Burk. ) F. H. Chen. [ Method ] Content of As was determined by heteromolybdoarsenic acid spectrophotometry, and the developing conditions were optimized. [ Result] The optimum developing conditions were :color developing agent amount of 5.0 mi,color developing temperature of 40 ℃ and developing duration of 30 min.When the concentration of standard As Ⅲ solution ranged from 0 to 0.04 μg/ml, the linear relationship between concentration and absorbance was good (r =0.996 6). Arsenic was not detected in sample. [ Result ] High in precision and good in stability,the method can be used as the determination method for As from Panax notoginseng ( Burk. ) F. H. Chen.