Buffer solutions & reagents

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This buffer is used for the determination of pH reference reagents and the calibration of high-precision pH meters. Equivalent to IUPAC Class C. The reagents of this level use the double hydrogen electrode of the liquid-free junction cell to measure the pH value. The accuracy of the method is ± 0.005 pH value. This reagent is generally produced by the state-controlled manufacturers and tested by the Chinese Academy of Metrology.

A solution for the preparation of pH reference reagents for the calibration of pH meters. Equivalent to IUPAC’s D level, each reagent manufacturer uses the primary pH reference reagent as a standard, and uses a double hydrogen electrode with a liquid junction cell to measure its pH value. The accuracy of the method is ± 0.01 pH value.

pH standard buffer solution is a set of standard solutions, its pH range is from 1.0-13.0, there is a standard solution every 0.1 pH in the range of pH 1.0-10.0; there is a standard solution every 0.2 in the range of pH 10.0-13.0. This solution can be used as a standard for the determination of pH value by colorimetric and a standard solution for the determination of the color range of acid-base indicators. The accuracy is ± 0.03 pH value. It is not as accurate as the pH reference reagent, so it is not suitable for the calibration of pH meters. The buffer volume is low, and it is not suitable for constant complex o metric titration buffer solution.

This kind of buffer solution is a special buffer solution for biochemical analysis. It is generally used to control the pH value in the research process of DNA, protein and other biological macromolecules. Considering the changes of DNA and protein, the pH range is between 5.0-8.0 pH.