Rilbe H
Electrophoresis. 1993 Jul;14(7):591-6. doi: 10.1002/elps.1150140193.
The general equation for the buffer capacity of trivalent weak acids is derived by way of the mean valence. It is valid for trivalent bases and ampholytes as well. Special interest is devoted to protolytes with symmetrically spaced pK values since both phosphoric acid and citric acid have this property. The symmetry implies a mathematical simplification which makes it possible to deduce the locations and magnitudes of the maxima and minima. Thus it is shown that the buffer capacity curve has three maxima and two minima for delta pK values bigger than 1.29.
通过平均化合价推导出三价弱酸缓冲容量的一般方程。它对三价碱和两性电解质也同样适用。具有对称间隔pK值的质子传递体受到特别关注，因为磷酸和柠檬酸都具有这一特性。这种对称性意味着一种数学简化，使得推断最大值和最小值的位置及大小成为可能。因此可以看出，对于δpK值大于1.29的情况，缓冲容量曲线有三个最大值和两个最小值。
