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Freundlich Equation

The most common shape of the graph of amount adsorbed per unit weight of
adsorbent versus the concentration in the fluid in equilibrium is:
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Typical Adsorption Isotherm

This graph very closely resembles that for microbial specific growth
rate coefficient versus substrate concentration. These data often fit nicely
the empirical equation proposed by Freundlich:

**q = K**_{f} C^{n}

where: **K**_{f} and **n** are
coefficients

**q **= weight adsorbed per unit wt of adsorbent

** C** = concentration in fluid

Taking logs and rearranging:

**log q = log K**_{f} + n log C

The coefficients K_{f} and n can be estimated from slopes and by substituting
values from a line fitted to a graph of log q versus log C. With a personal
computer handy, the method of least squares can be used to get a statistical
fit, however outlying data points are not as obvious as with a graph.

**Step-by-step example of finding Freundlich coefficients.
**

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