【摘要】 在 pH 6 3的KH2 PO4 Na2 B4O7缓冲体系中 ,利用痕量Ni(Ⅱ )催化H2 O2 氧化胭脂红的褪色反应 ,反应受温度、反应时间影响 ,冷却可终止反应。基于此 ,建立一种测定痕量Ni(Ⅱ )的光度法。结果表明方法的检出限为 2 5× 10 -11g·mL-1,催化程度与Ni(Ⅱ )量在 0 0～ 1 2 μg·5 0mL-1范围内符合比耳定律。本法结合萃取分离 ,满意地测定了煤矸石中的微量Ni。更多还原

【Abstract】 In KH 2PO 4-Na 2B 4O 7(pH=6 3) buffered solution the trace Ni(Ⅱ) can strongly catalyze the fading reaction of carmine.Time and temperature can influence the reaction,and the reaction stops at the low temperature.Based on this study,a catalysis spectrophotometric method for determining trace Ni(Ⅱ) is developed.The results show that the detection limits of the method is 2 5×10 -11 g·mL -1 for Ni(Ⅱ) and Beer′s law is obeyed for Ni(Ⅱ) in the range of 0-1 2 μg·50 mL -1 .Combined with solvent extraction separation,the method has been applied to the determination of trace Ni in coal gangue with satisfactory results.更多还原