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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)。
It is reported that the method for the determination of trace niobium in steel by the extraction of bis (benzo-18-crown-6) and potassium thiocyanate reagent has high sensitivity and high sensitivity (ε 400nm) = 3.85 × 10-4L · mol ~ (-1) · cm ~ (-1). The linear regression equation was 0.936C (mg · ml ~ (-1)) - 1.425 × 10 ~ (-3).