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19 Nov 2019
The analysis of a soil indicates that its composition by weight is 22% clay minerals of which 5 % is smectites (150 meq/100 g at pH 6; 155 meq/100 g at pH 7) and 95% is kaolinite (3 meq/100 g at pH 6; 6 meq/100 g at pH 7). In addition, the soil contains 2.1% organic matter (250 meq/100 g at pH 6; 290 meq/100 g at pH 7). Assuming that these are the only fractions that provide negative charge to this soil calculate the corresponding CEC (in meq/100 g) at pH values of 6 and 7. (Review Example Problem, page 23 of 7^th edition textbook, page 26 of 8, h edition textbook).
The analysis of a soil indicates that its composition by weight is 22% clay minerals of which 5 % is smectites (150 meq/100 g at pH 6; 155 meq/100 g at pH 7) and 95% is kaolinite (3 meq/100 g at pH 6; 6 meq/100 g at pH 7). In addition, the soil contains 2.1% organic matter (250 meq/100 g at pH 6; 290 meq/100 g at pH 7). Assuming that these are the only fractions that provide negative charge to this soil calculate the corresponding CEC (in meq/100 g) at pH values of 6 and 7. (Review Example Problem, page 23 of 7^th edition textbook, page 26 of 8, h edition textbook).