摘要
介绍氧瓶或消化分解LaCl_3-EDTA和YCl_3-EDTA法测定有机砷化合物中砷的新方法。LACl_3-EDTA法适用于氧瓶分解,样品含硫有干扰;YCl_3-EDTA法不受SO_4^(2-)干扰,因而还适用于以硫酸为主要消化剂的消化分解和测定。测定误差<±0.30％。
Arsenic in organic compounds was determined by LaCl3-EDTA or YC13-EDTA indirect complexometric titration. The LaCl3-EDTA method was properly used for oxygen flask decomposition (iodine-water as absorbent) and SO42- interference , but the YC13-EDTA method was also used for digestion decomposition using H2SO4-HNO3 as the di-gestion agent. The formation of LaAsO4 or YAsO4 was carried out in pH5. 5 and boiling tem-perature. After cooling, an equal amount of alcohol and appropriate xylenol orange were added and the excess of LaCl3 or YC13 was titrated with 0. 01 mol ?L-1 EDTA. The maximun deriation in the determination of As was ?.30%.
出处
《武汉大学学报（自然科学版）》
CSCD
1994年第6期71-75,共5页
Journal of Wuhan University(Natural Science Edition)
关键词
络合滴定
镧
钇
有机砷化合物
complexometric titration, lanthanum, yttrium, organoarsenic compound
