求翻译：称取0.5 g高纯铁按照1.2的实验方法进行前处理，分取11份试液，按照国家标准[2]中Nb的测定范围（0.01%～0.5%），分别在50 mL显色体系中加入0～50 μg Nb进行显色试验，测得 Nb含量在此范围内和吸光度的线性回归方程为A=0.0138ρ（μg/50 mL）+0.023 2，R2=0.999 3，表观摩尔吸光系数为3.21×104 L•mol-1•cm-1。是什么意思？

Weigh 0.5 g of highly pure iron according to experimental methods 1.2 pre-treatment, get 11 test solution, according to national standards [2] The measurement range of Nb (0.01% ~ 0.5%), respectively, in 50 mL color system by adding 0 ~ 50 μg Nb for color test measured the Nb content in this range a

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Front the name takes 0.5 g high ferrite to carry on according to 1.2 experimental techniques processes, divides takes 11 test solutions, according to national standards [2] in the Nb determination scope (0.01%~0.5%), separately joins 0~50 μg Nb in 50 mL colored systems to carry on the color test, ob

Said take 0.5 g high pure iron in accordance with the 1.2 of experimental method for Qian processing, min take 11 copies try liquid, in accordance with the national standards [2] in the Nb of determination range (0.01%~0.5%), respectively in 50 mL explicit color system in the joined 0~50 μ g Nb for

Said take 0.5 g high pure iron in accordance with the 1.2 of experimental method for Qian processing, min take 11 copies try liquid, in accordance with the national standards [2] in the Nb of determination range (0.01%~0.5%), respectively in 50 mL explicit color system in the joined 0~50 μ g Nb for