摘要: Early estimations of pH values in plant cells were based upon determinations the electromotive force (EMF) developed between a standard hydrogen electrode and fluid expressed from crushed tissues or liberated by cutting large algal such as those Valonia, Chara Nitella. These EMF then translated into terms ion concentration on assumption that numerical value volts depended entirely ions. Then measured this way was found to act biological reactions, mainly enzyme activity, apparent related logarithmically process investigated. So Sorensen 1909 introduced scale what he called “hydrogen-ion exponent.” He defined pH+ \({1 \over {\left( {\log {P_{{H^ + }}}} \right)}}\) (1909, p. 28, not 4) became matter typographical convenience.
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