Buffer standards for the physiological pH of the zwitterionic buffer 3-[<i>N</i>-tris(hydroxymethyl)methylamino]-2-hydroxypropanesulfonic Acid (TAPSO) From (278.15 to 328.15) K
- 1
- 2
- 3
- 4
- 5
- 6
- 7
Abstract
The second dissociation constant, p<i>K</i><sub>2</sub>, and related thermodynamic quantities for TAPSO have been previously determined and reported from the temperatures (278.15 to 328.15) K. In the current study there are five buffer solutions without NaCl and five buffer solutions with NaCl present which yield an ionic strength (<i>I</i> = 0.16 mol·kg<sup>-1</sup>) similar to that of blood plasma. These buffer solutions have been evaluated in the temperature range of (278.15 to 328.15) K using the extended Debye-Hückel equation, due to the limitations of the Bates-Guggenheim convention such that it is only valid when <i>I</i> < 0.1 mol·kg<sup>-1</sup>. The liquid junction potential (<i>E</i><sub>j</sub>) values between the TAPSO solution and the saturated KCl calomel electrode solution have been estimated at (298.15 and 310.15) K using a flowing junction cell measurement. The previously mentioned <i>E</i><sub>j</sub> values have been used in determining the operational pH values at (298.15 and 310.15) K. These TAPSO buffer solutions are recommended as reference solutions for pH measurements in saline media with an ionic strength of <i>I</i> = 0.16 mol·kg<sup>-1</sup>.
- Good, N.E., Winget, G.D., Winter, W., Connolly, T.N., Izawa, S. and Singh, R.M.M. (1966) Hydrogen ion buffers for biological research. Biochemistry, 5, 467-477. doi:10.1021/bi00866a011
- Ferguson, W.J., Braunschweiger, K.L., Braunschweiger, W.R., Smith, J.R., McCormick, J.J., Wasman, C.C., Jarvis, N.P., Bell, D.H. and Good, N.E. (1980) Hydrogen ion buffers for biological research. Analytical Chemistry, 104, 300-310.
- Roy, L.N., Roy, R.N., Denton, C.E., LeNoue, S.R., Roy, C.N., Ashkenazi, S., Fuge, M.S., Wollen, J.T., Stegner, J.M., Allen, K.A. and Harmon, M.A. (2009) Buffer standards for the biochemical pH of 3-(N-morpholino)-2-hydroxypropanesulfonic acid from (278.15 to 328.15) K. Journal of Chemical Engineering Data, 54, 1860-1864. doi:10.1021/je800983y
- Roy, L.N., Roy, R.N., LeNoue, S.R., Denton, C.E., Fuge, M.S., Dunseth, C.D., Roy, C.N., Hayden, S.M., Wollen, J.T. and Sreepada, K. (2009) Buffer standards for the physiological pH of the zwitterionic compound, DIPSO, from 5?C to 55?C. Journal of Solution Chemistry, 38, 459-469. doi:10.1007/s10953-009-9379-2
- Bower, V.E., Paabo, M. and Bates, R.G. (1961) A standard for the measurement of the pH of blood and other phy- siological media. Journal of Research of the National Bureau of Standards, A65, 267-270.
- Durst, R.A. and Staples, B.R. (1972) Tris/Tris HCl: Standard buffer for use in the physiological pH range. Clini- cal Chemistry, 18, 206-208.
- Feng, D., Koch, W.F. and Wu, Y.C. (1989) Second dissociation constant and pH of N-(2-hydroxyethyl)pipera- zine-N’-2-ethanesulfonic acid from 0?C to 50 ?C. Analytical Chemistry, 61, 1400-1405. doi:10.1021/ac00188a019
- Wu, Y.C., Berezansky, P.A., Feng, D. and Koch, W.F. (1993) Second dissociation constant of 3-(N-morpholino) -2-hydroxypropanesulfonic acid and pH of its buffer solutions. Analytical Chemistry, 65, 1084-1087. doi:10.1021/ac00056a023
- Roy, R.N., Mrad, D.R., Lord, P.A., Carlsten, J.A., Good, W.S., Allsup, P., Roy, L.N., Kuhler, K.M., Koch, W.F. and Wu, Y.C. (1998) Thermodynamics of the second dissociation constant and standards for pH of 3-(N-morpholino) propanesulfonic acid (MOPS) from 5?C to 55?C. Journal of Solution Chemistry, 27, 73-87. doi:10.1023/A:1022692629289
- Bates, R.G., Vega, C.A. and White, D.R. (1978) Standards for pH measurements in isotonic saline media of ionic strength I = 0.16. Analytical Chemistry, 50, 1295-1300. doi:10.1021/ac50031a026
- Bates, R.G. (1973) Determination of pH. Wiley, New York.