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5. 水中六价铬的测定 —— 分光光度法

540. 4. 3. 2. 1. 1. T. T/0A. 0%. 100%. 0. 5. 水中六价铬的测定 —— 分光光度法. 一、实验目的:. 1. 学习用二苯碳酰二肼分光光度法测定废水中重金属铬的原理和方法; 2. 掌握分光光度计的使用方法。. 二、实验原理. 在酸性溶液中,六价铬与二苯碳酰二肼( DPC )反应生成紫红色化合物,于波长 540nm 处进行分光光度测定. 三、实验内容. 1. 水样预处理. 三、实验内容. 2. 标准曲线的制作及水样测定( b=3.0cm,λ=540nm ,试剂空白为参比). 四、思考题.

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5. 水中六价铬的测定 —— 分光光度法

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  1. 540 4 3 2 1 1 T T/0A 0% 100% 0 5.水中六价铬的测定——分光光度法

  2. 一、实验目的: • 1.学习用二苯碳酰二肼分光光度法测定废水中重金属铬的原理和方法; • 2.掌握分光光度计的使用方法。

  3. 二、实验原理 在酸性溶液中,六价铬与二苯碳酰二肼(DPC)反应生成紫红色化合物,于波长540nm处进行分光光度测定

  4. 三、实验内容 1.水样预处理

  5. 三、实验内容 2.标准曲线的制作及水样测定(b=3.0cm,λ=540nm,试剂空白为参比) 四、思考题 当水样同时含有Cr(VI)和Cr(III)时,用二苯碳酰二肼分光光度法如何测定Cr(III)的含量?

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