Cation Exchange Capacity Calculation Sample Clauses

Cation Exchange Capacity Calculation. Scope and Application For general soil characterization or an estimation of CEC many laboratories do not perform a direct measurement of CEC. Instead they use a calculation based on the sum of Ca2+, Mg2+, K+, and Na+ quantified through a direct Mehlich 3 or ammonium acetate extraction and ICP measurement of these cations. Under low pH conditions (pH<5.5) exchangeable Al3+ should be added to this calculation. If the pH is over 7.5 unreacted lime or other salts may lead to an overestimation of the effective CEC because they can become dissolved in the extracting solution. There are also pedotransfer functions that use the clay, pH, and organic matter content of the soil to estimate the CEC. This is an inference with less accuracy than a laboratory measurement but it can be useful, especially in the field or where laboratory work is not available. Calculation of CEC of soil based on ammonium acetate or Mehlich 3 extraction procedure:
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