Explain why there is environmental concern about the adsorption by soil colloids of such normally beneficial substances as antibiotic drugs and natural insecticides. Soil pH gives a measure of the...

Explain why there is environmental concern about the adsorption by soil colloids of such normally beneficial substances as antibiotic drugs and natural insecticides.

Soil pH gives a measure of the concentration of H+ ions in the soil solution. What, if anything, does it tell you about the concentration of OH- ions? Explain.