Use of Diffusion to Determine Soil Cation-Exchange Capacity by Ammonium Saturation
نویسندگان
چکیده
Soil cation-exchange capacity (CEC) is often determined by NH4 saturation, using a 1M solution of NH4C2H3O2 at pH 7. A study was conducted to ascertain whether this determination can be performed by employing a simple diffusion technique previously developed for direct inorganic-N analysis of soils. Values obtained for 10 diverse Illinois surface soils following overnight NH4 saturation were correlated very highly with CEC data collected for the same samples on the basis of NH4 analyses by steam distillation (r1⁄4 0.999, *Correspondence: R. L. Mulvaney, Department of Natural Resources and Environmental Sciences, University of Illinois, 1102 South Goodwin Ave., Urbana, IL 61801, USA; Fax: (217) 244-2755; E-mail: [email protected].
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