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Citation: ZHANG Yan-Ni, SHANG Xiao, WANG Hui, YUE Xuan-Feng. A Buffer with Constant Buffer Capacity in a Wide pH Range[J]. University Chemistry, ;2017, 32(7): 88-92. doi: 10.3866/PKU.DXHX201701001 shu

A Buffer with Constant Buffer Capacity in a Wide pH Range

1.
Key Laboratory of the Ministry of Education for Medicinal Resources and Natural Pharmaceutical Chemistry, Shaanxi Normal University, Xi'an 710062, P. R. China;
2.
Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, Shaanxi Normal University, Xi'an 710062, P. R. China

The buffer,composed of 6 weak acids with the different pK_a(citric acid,phosphoric acid,boric acid,hydrazine,dimethylamine cation and diethylamine cation),can work well in the pH range of 2-12.By manipulating the combination of the concentrations of the weak acids,a constant buffer capacity of 0.7C _average can be obtained in the entire pH range.All the precise calculations and plottings were conducted via the Sigmaplot software.
- Constant buffer capacity,
- Wide pH range,
- pH buffer system
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