【摘要】 研究了硒 (IV)对溴酸钾氧化靛蓝胭脂红褪色反应的催化作用及NaCl的活化作用 ,建立了一种测定微量硒的方法 ,硒量在 0～ 1 0 μg/mL范围内与ΔA呈线性关系 ,检出限为 0 0 2 μg/mL。在NaF及尿素存在下 ,多数常见离子无干扰。本法灵敏度及选择性较高 ,用于茶叶中微量硒的测定 ,结果满意更多还原

【Abstract】 A sensitive and selective kinetic spectrophotometric method for the determination of selenium(IV) at 25℃ was developed, based on the catalytic oxidation of indigo carmine with KBrO 3 in 0.4mol/L H 2SO 4 medium. The linear range and detection limit is 0.02～1.0μg/mL and 0.02μg/mL, respectively. In the presence of NaF and urea, most of the common ions did not interfere. The method was applied to the determination of trace Se in tea with satisfactory results.更多还原