pH梯度萃取法分离黄酮苷元类，加碱液萃取的顺序应是A:NaHCO3→NaOH→Na2CO3 B:NaHCO3→Na2CO3→NaOH C:NaOH→N...

作者: tihaiku 人气: - 评论: 0

问题 pH梯度萃取法分离黄酮苷元类，加碱液萃取的顺序应是

选项 A:NaHCO₃→NaOH→Na₂CO₃ B:NaHCO₃→Na₂CO₃→NaOH C:NaOH→NaHCO₃→Na₂CO₃ D:NaOH→Na₂CO₃→NaHCO₃ E:Na₂CO₃→NaHCO₃→NaOH

答案 B

解析黄酮苷元显酸性，加碱的次序是由弱到强，所以是B。

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