【摘要】 基于稀磷酸介质,溴离子抑制溴酸钾氧化中性红,建立了测定痕量溴离子的新催化光度法。方法的表观摩尔吸光系数为1.0×10⁶L·mol^-1·cm^-1,灵敏度为7.9×10^-11g/ml（△/0.001,b=1cm）,用于测定镁条的硫酸铵中溴。更多还原

【Abstract】 A new catalytic spectrophotometric method for the determination of trace Br^- has been developed. The method is based on the inhibitory effect of Br^- on the oxidation of neutral red by potassium bromate in a solution of diluted H₃PO₄. The sensitivity of the method is 7.9×10^-11g/ml（△A=0.001, b=1cm）, the apparent molar absorptivity is 1.0×10⁶L·mol^-1·cm^-1. The method has been used to determine trace Br^- in（NH₄）₂SO₄ and magnesium metal.更多还原