【摘要】 在三氯乙酸介质中,以溴化钾为催化剂,研究了BrO3-氧化甲基橙退色的最佳条件.以510 nm为甲基橙退色溶液的测定波长,KBrO3在0.01-0.2μg/mL范围内,甲基橙退色溶液的吸光度值与溴酸钾含量显著相关,相关系数R2=0.9993,检测限为3.8×10-3μg/mL,试样测定结果的相对标准偏差(RSD)为<8%,试样加标回收率为86.9%-99.5%.更多还原

【Abstract】 A sensitive spectrophotometric method for the determination of bromate ion is described.The method is based on the decrease in color of aqueous methyl orange by bromate ion in acidic conditions(Cl3CCOOH) to produce a colored species at the maximum absorption wavelength 510nm.The method is suitable for bromate ion determination in the 0.01 μg/mL～0.2 μg/mL range(R2=0.9993).The limit of detection is 3.8×10-3 μg/mL and the relatively standard variance of the method is <8 %.The recovery for bromate added in tap water were 86.9%～99.5%.更多还原