Color. At the front of the room, a sample of each soil sample has becn wetted to
ID: 290115 • Letter: C
Question
Color. At the front of the room, a sample of each soil sample has becn wetted to show its color. Fll in the color of the soil in column labeled Part 3 in the Table on page 10. Texture. Determine the overall texture by taking a pinch of dry soil between your fingers and rolling it around. If it feels sandy, it is on the sandy side of the soil diagram. If it leaves a fine powdery residue on you fingers, it also contains clay. All the soils we are looking at are basically loams. Make a best guess as to the imodifier (sandy, silty or clayey loam). Put your results in the column labeled Part II.4 in the Table on page 10. pH mcasurement. Using pH test kits. a. Your lab instructor will put a pinch of soil into two positions in your white spot plate. (Best todo one soil at a time.) You lab instructor will put a couple of drops of duplex indicator solution into the first spot. Stir the solution. Refer to the Duplex pH Color Chart and match the color of the solution of your soil with the closest color on the chart. Note the pH that corresponds to that color. Put you answer in the Table on Page 10, Part I.5b column b. c. Your lab instructor will put a few drops of the appropriate indicating solution that is closest to the pH range indicated by the duplex solution in part b. Match the color of the solution of your soil with the closest color in the pH chart for that particular phH indicating solution. Put you answer in the Table on Page 10, Part I1.5c column Bromcresol Green: pH 3.8-5.4 for pH between 4 and 5 Chlorphenol Red: pll 5.2-6.8 for pll between 5 and 6 Bromthymol Blue pH 6.0-7.6 for phi between 6 and 7 Phenol Red pH 6.8-8.4 for pH between 7 and 8 . Humus Content. d. We will test the humus content in the soils from the profile at Site I. Use the two slender tubes marked with numExplanation / Answer
a. The percolation in a soil is dependent on its permeability which accounts for the number of connected pore spaces that are present in a soil. Now if thw permeability is high contaminants will percolates easily and vice versa. Permeability of soil with small particle size is low which high for soil which have bigger particle size. Therefore sandy soil will have more permeability and thus will leach chemicals more quickly to the ground water.
b. Clay soil have the finest particle and thus will have the lowest permeability therefore it will be more likely to retain chemicals in the soil.
c. The soil with most charged structures will have high cation exchange capacity and shale have a structure that contains charged individual sheets, therefore it will have highest cation exchange capacity.
d. Loamy soil have a ratio of 40% sand, 40% silt and remaining 20% is clay and hence there are very high chances that the chemicals will percolates.
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