偶氮胂Ⅲ分光光度法是测定元素钐的重要手段.但是,溶液中有共存离子Ca2+、F-会对计量产生一定的干扰.通过改变溶液中Ca2、F-含量,研究它们在偶氮胂Ⅲ分光光度法测定钐中的影响规律.实验结果表明,当溶液中不含Sm3+时,F-浓度的变化对吸光度没有影响;当溶液中含有Sm3+时,随着F-浓度的增加,溶液吸光度减小.随着Ca2+浓度的增加,溶液吸光度呈明显增大趋势,但当溶液中含有Sm3+时,Ca2+对吸光度增大幅度有减弱的趋势.最后,获得了溶液中同时存在CaC12、CaF2时对偶氮胂Ⅲ分光光度法检测Sm元素吸光度影响的定量规律,其最大相对误差为2.70％.
Spectrophotometric method with arsenazo Ⅲ is an important method for determination of samarium as a rare earth element.However,previous studies have shown that,existing of Ca2+ and F-ions in the solution will have some interference to the measurement.In this paper,through changing the content of Ca2 + and F-in the solution,the influence on the determination of samarium in spectrophotometry with arsenazo Ⅲ had been studied.The results show that,when Sm3 + has not in the solution,changing of F-concentration has no effect on the absorbance as the signal of measurement,while the absorbance decreases with the increase of F-concentration in the solution of Sm3 + contained..With the increase of Ca2 + concentration in the solution,the absorbance is significantly increasing,but when the solution contains Sm3+,the increasing trend is weakened.Finally,the quantitative relationship with CaCl2 and CaF2 on the absorbance is obtained,in which the maximum of relative error is 2.70 ％.
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