摘要
针对二苯碳酰二肼分光光度法测定铬(Ⅵ)时,存在显色剂不稳定、保存时间短的问题进行改进,通过向显色剂中分别加入磷酸,乙酸乙酯,甘油,抗坏血酸溶液等4种抗氧化剂,探讨其对显色剂稳定性能的影响。结果显示,向显色剂中加入0.25 m L磷酸、2.0 m L乙酸乙酯或甘油,均能增强显色剂在室温条件下的稳定性;而加入抗坏血酸反而破坏了显色剂的稳定性,对铬(Ⅵ)的测定结果误差超过10%,不能用作显色剂的稳定试剂。
The chromogenic agent can easily be oxidized in the air and lose its validity by using the spectrophotometric method to determine chromium（ Ⅵ）. To improve the stability of the chromogenic agent, four antioxidants were added into the chromogenic agent solution,respectively. The results showed that the chromogenic agent could be effectively deposited at room temperature by adding 0. 25 m L of phosphate,2. 0 m L of glycerin or ethyl acetate into the chromogenic agent solution. However,the ascorbic acid solution could damage the chromogenic agent.
出处
《广州化工》
CAS
2016年第6期133-135,共3页
GuangZhou Chemical Industry
基金
河南师范大学国家级大学生创新创业训练计划项目(No:201310476058)
关键词
铬(Ⅵ)
二苯碳酰二肼
光度法
chromium（Ⅵ）
diphenyl carbonyl hydrazine
spectrophotometric method
