Gapon's equation

The Gapon equation is an equation used in soil science that describes the ratio of the amount of cations dissolved in the soil in their exchange for other cations in soil chemistry . The equation for evaluating the fertility of soils is important. It was developed by the Russian chemist EN Gapon.

The ratio of the amount of cations in the soil, which is understood here as an exchanger, results in: ${\displaystyle {\tfrac {X}{Y}}}$

${\displaystyle \left({\frac {X}{Y}}\right)_{s}=K_{\mathrm {G} }\times \left({\frac {a_{X}}{\sqrt {a_{Y}}}}\right)_{l}}$

With

${\displaystyle X,Y}$: Cations (e.g. ) ${\displaystyle X=\mathrm {Na} ^{+},Y=\mathrm {Ca} ^{2+}}$

${\displaystyle K_{\mathrm {G} }}$: Gapon coefficient

${\displaystyle s}$: sorbed (in mmol per kg soil)

${\displaystyle a}$: Activity

${\displaystyle l}$: in the solution

Individual evidence

1. ↑ Scheffer / Schachtschabel: Textbook of Soil Science , 16th edition, Heidelberg 2009, p. 148, ISBN 978-3-8274-1444-1
2. ^ M. Bahadir, H. Parlar, Michael Spiteller: Springer Umweltlexikon . 2000, p. 475 .