【摘要】 本文研究了在pH9.2—9.5氨性缓冲溶液中,Cu（Ⅱ）催化H₂O₂氧化溴酚蓝和丁基罗丹明B等色染料离子对褪色的新指示反应,建立了较为广泛的快速终止催化反应的新方法。本方法测定铜,检出限为0.02μg/L,5次测定结果相对标准偏差（RSD）<4％,线性范围为0.1～10μg/L。用于直肠癌组织中微量元素铜的测定,结果满意。更多还原

【Abstract】 In this paper an isochromatic dye ion-pairs extraction - catalytic spectrophotometric method for the determination of trace copper is studied. The method is based on the copper catalyzed oxidation of isochromatic dye ion-pairs formed by buthylrhodamine B and bromophenol blue by hydrogen peroxide in ammoniac medium. The reaction time, concentration of isochromatic dye ion - pairs in aqueous phase and degree of reaction are controlled by extraction equilibrium. The detection limit of this method is 0.02μg/L.The linear range is 0.1-10μg/L respectively. The method has been applied to the determination of trace copper in tumor tissue with satisfactory results.更多还原