A 100 g sample of a soil has been determined to contain the exchangeable cations in these amounts: Ca2+ = 90 mg, Mg2+ = 35 mg, K+ = 28 mg, Al3+ = 60 mg. (a) What is the CEC of this soil? (b) What is...

A 100 g sample of a soil has been determined to contain the exchangeable cations in these amounts: Ca2+ = 90 mg, Mg2+ = 35 mg, K+ = 28 mg, Al3+ = 60 mg. (a) What is the CEC of this soil? (b) What is the aluminium saturation of this soil?

Explain the importance of Kd and Koc in assessing the potential pollution of drainage water. Which of these expressions is likely to be most consistently characteristic of the organic compounds in question regardless of the type of soil involved? Explain.