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超微量溴的测定方法,报导甚少.文献曾对Br~-离子催化溴酸钾氧化甲基橙(MO)的动力学作了研究,并应用于痕量溴的测定.作者发现在适当的盐酸—硫酸缓冲体系中,Br~-对KBrO_3 -MO反应表现出稳定的最佳的催化效应.当Br~-浓度为20～500ng/ml时,Br~-浓度与反应速度(甲基橙吸光度降低的速度)有很好的线性关系.甲基橙最大吸收在510nm.一、试剂与仪器混酸:取浓盐酸(36%)33.4ml及浓硫
The method for the determination of trace amounts of bromine has been reported in the literature.The kinetics of methyl bromide (MO) oxidation catalyzed by bromine ion by Br ~ - ion has been studied in literature and applied to the determination of trace bromine.The authors found that in the presence of appropriate hydrochloric acid - In the buffer system of sulfuric acid, Br ~ - showed the best catalytic effect on the KBrO_3-MO reaction.When the concentration of Br ~ - was 20 ~ 500ng / ml, the concentration of Br ~ - and the reaction rate Speed) has a good linear relationship.Methyl orange maximum absorption at 510nm.A reagent and instrument mixed acid: Take concentrated hydrochloric acid (36%) 33.4ml and concentrated sulfur