镍铁合金电镀液中微量钐的二阶导数分光光度法测定
Second Derivative Spectrophotometric Determination of Micro Samarium in Nickel iron Alloy Electroplating Solution
Abstract
探讨了在弱酸性介质的钐-偶氮胂Ⅲ体系中采用二阶导数分光光度法测定微量钐的方法.本方法具有较好的选择性和灵敏度，检测限达0.250Mg/l，铁、镍等共存离子的允许量可达千倍以上，故可以不经分离或掩蔽而直接测定镍铁合金镀液中的微量钐 A second derivative spectrophotometric method For determination of micro samarium in nickel iron alloy electroplating solution is proposed , with Arsenazo Ⅲ as the color reagent.The content of samarium is determined at the wavelengthes of 655 nm and 677 nm. The method demonstrated itselF to be simple, rapid, convenient and accurate.It can be used For the determination of micro samarium in nickel iron alloy electroplating solution.The relative standard deviations are less than 2% and the recoveries are From 98.3 to 103.0%.