摘要
报道了用双(苯并-18-冠-6)和硫氰酸钾试剂萃取光度测定钢铁中的微量铌,方法的选择性好,灵敏度高,ε_(400nm)=3.85×10~4L·mol^(-1)·cm^(-1),铌在1～20μg/25ml范围内有较好的线性关系,线性回归方程A=0.936C(mg·ml^(-1))-1.425×10^(-3)。
An extraction photometric method for the determination of microamounts of niobium in steels by the reaction system Nb-SCN-bis (benzo-18-croun-6) is reported in this paper. The method is proved to be good both in selectivity and sensitivity. The molar absorptivity is 3. 85×10~4L·mol^(-1) ·cm^(-1), and Beer's law holds in the range 0 ~ 20μg of Nb in a total volume of 25ml and the following linear regression equation is obtained:A= 0. 936C(Nbμg ·ml^(-1))-l. 45×10^(-3).
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
1999年第5期216-217,共2页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
关键词
冠醚
硫氰酸钾
铌
萃取光度法
钢铁
测定
Bis (benzo-18-croun-6), KSCN, Niobium, Steel, Extraction-photometry
