100 g of soil sample is collected at the field. The field analysis indicates 5%
ID: 105442 • Letter: 1
Question
100 g of soil sample is collected at the field. The field analysis indicates 5% organic matter and 30 % clay in the soil. (a) Estimate the Cation Exchange Capacity of the soil. The laboratory analysis indicated that the following metals are in the soil. (b) Calculate the base saturation percentage of the soil. Using the following pzc table below, (a) draw a rough surface charge diagram as a function of pH for alpha-AI_2O_3, Fe_3O_4, montmorillonite, and chrysotile (b) identify which of the four (alpha-AI_2O_3, Fe_3O_4, montmorillonite, and chrysotile) will interact with Zn^2+ at pH 7.Explanation / Answer
a) Calcium = 20 Sodium = 23 Magnesium = 12 Potassium = 39
value in ppm,
ca =80 , Mg=20 , Na=40 , K=50
cation exchange capacity ,
Potassium 50/39 = 1.28, Magnesium 20/12 = 1.66 Calcium 80/20 = 4 Sodium 40/23 = 1.73
total CEC value = 8.67 meq/100 gm
b) base saturation percentage
Potassium 1.28/8.67 = 14.76% Magnesium 1.66/8.67 = 19.14% Calcium 4/8.67 = 46.13% Sodium 1.73/8.67 = 19.95%
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