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Extraction

Saurabh Levin edited this page Feb 21, 2019 · 9 revisions

Things You Will Need

  1. A small shovel

  2. A 30 ml measuring tube

  3. A bottle of Mehlich's solution (or KCl, in the case of pH)

  4. A syringe

  5. A syringe filter (0.45μm)

  6. A 10 ml measuring tube


Steps

  1. Collect a soil sample, and leave it in the sun for 10 minutes to dry.
                      

  2. Take 25 ml of extraction solution (KCl for pH, Mehlich's for all other parameters) in the 30ml mixing tube. Carefully pour small quantities of soil until the level of solution rises to 30 ml.
                    

  3. Close the lid of the measuring chamber and shake it thoroughly to maximise the mixing of extract with the soil. Let the mixture sit for about 10 minutes until all the soil settles at the bottom.
                  

  4. Dip the end of the syringe into the solution and draw out all of the extracted soil sample.

  5. Fix the syringe filter onto the adapter of the syringe, and filter the quantity of extract that you require for your test (refer to the specific test page) into the smaller measuring cylinder.
                                                    

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