Bromine 0.05000mol/L,1000μg/ml,0.1250 mol/L (0.25N),0.1000 mol/L (0.2N),0.2000mol/L (0.4N),0.2500 mol/L (0.5N),0.02500mol/L(0.05N),1mol/L (溶剂:二氯甲烷)