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Unformatted text preview: Ryan Strauss The lab that we will be completing this week is titled Soil Colloids: Soil chemical and physical characteristics. The single most important property of soil colloids is their negatively charged surfaces, which in turn is the attraction or absorption of cations known as the cation exchange capacity (CEC). The way that soil colloids hold cations depends on the charge density, which is determined by charge and hydrated radius. The way to actually measure the CEC of soils is by using the equation: K + Mg + Ca + Na/ Total CEC (cmolc) of soil. Also to measure the CEC of a soil, two soil characteristics must be know: percentage of Humus and or organic material and amount and type of clay present. This particular experiment will be completed in three parts. Part 1 you will start with 5 grams of soil 1(sandy soil) and soil 2(Clay loam) and place them in separate test tubes. Then you will add 10ml of 0.01 M ba solution to each of the test tubes and shake for a minute. After that filter and collect 1ml of the 0....
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This note was uploaded on 10/25/2010 for the course SWES 201 taught by Professor Wilson during the Fall '10 term at University of Arizona- Tucson.
- Fall '10