Problem 3
A particular lake sediment sample is made up of \(23 \%\) organic matter \(77 \%\) mineral fraction \(42 \%\) clay minerals \(24 \%\) silt \(11 \%\) sand The clay minerals are \(90 \%\) kaolinite and \(10 \%\) halloysite. Calculate an approximate cationexchange capacity \(\left(\mathrm{cmol}(+) \mathrm{kg}^{-1}\right)\).
Problem 7
The Kow function is frequently used to describe the movement of pesticides in the surface soil pore water, but it is used less frequently to describe the behaviour of an organic contaminant in groundwater, Explain.
