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分光光度法 铝含量的测定

分光光度法 铝含量的测定. Spectrophotometry in the Determination of Aluminum. Beer–Lambert L aw. Chrome Azurol S & Aluminum. pH5 ～ 6 铝 与铬天青 S 生 成 紫 红色络合 物. 样品溶液. 称取 0.3~0.4g 样品 , 加水溶解 配 成 250mL 溶液 , 稀释 100x Al 的浓度大约为 0.7~1.0 μ g/mL. 1 μ g/mL 铝标准溶液. 准确称取 Al 粉 0.6250g 加入过量 KOH 溶液 , 加热溶解

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分光光度法 铝含量的测定

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  1. 分光光度法铝含量的测定 Spectrophotometry in the Determination of Aluminum

  2. Beer–Lambert Law

  3. Chrome Azurol S& Aluminum pH5～6铝与铬天青S生成紫红色络合物

  4. 样品溶液 称取0.3~0.4g样品, 加水溶解 配成250mL溶液, 稀释100x Al的浓度大约为0.7~1.0μg/mL 1μg/mL铝标准溶液 • 准确称取Al粉0.6250g • 加入过量KOH溶液, 加热溶解 • 加入过量HCl溶液, 沉淀消失 • 配成250mL溶液, 稀释2500x Solution Preparation

  5. 1%NH3 2mL调节pH • 1%抗坏血酸 2mL掩蔽剂 • 1g/L铬天青S 2mL显色剂 • 200g/L乙酸铵 5mL提供缓冲环境 • 定容摇匀静置30min Pretreatment

  6. Solutions 不同铝浓度的铬天青S溶液

  7. Determination of the Absorption Wavelength

  8. Standard Curve 屏蔽III, VIII样品进行线性拟合

  9. 样品溶液的吸光度是0.222 • 样品溶液的铝浓度是0.7692mg/L • 称取样品的铝含量是19.23mg • 样品中明矾含量, 以Al计为337.6mg • 样品的纯度为94.46% Results

  10. Spectrophotometry of a Mixture

  11. Determinationof Wavelength

  12. Derivation

  13. Thanks

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