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| Determination of Cation Exchange Capacity of Soil by Centrifugal Exchange of Ammonium and Calcium Acetates |
| Received:October 24, 2016 Revised:November 21, 2016 |
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| DOI：doi:10.3969/j.issn.2095-1035.2017.03.010 |
| KeyWord:cation exchange capacity (CEC); centrifugal exchange of ammonium acetate; centrifugal exchange of calcium acetate; pH |
| Author | Institution |
| LA Maoji |
国土资源部兰州矿产资源监督检测中心，兰州 |
| WANG Yugong |
国土资源部兰州矿产资源监督检测中心，兰州 |
| ZHANG Rong |
国土资源部兰州矿产资源监督检测中心，兰州 |
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| Abstract: |
| The results of Cation Exchange Capacity (CEC) for soil has important significance in agriculture. In this paper, the centrifugal exchange methods used in the agricultural industry standards of NY/T295—1995 and NY/T1121.5—2006 for CEC determination are optimized. The selection of two methods on the basis of soil samples with different pH is discussed. The reason behind the poor reproducibility of CEC determination is also analyzed. The results show that the pH range could be used as an important basis for the methods selection. The samples with pH<7.0 were suitable for centrifugal exchange of ammonium acetate and those with pH≥7.0 for centrifugal exchange of calcium acetate. Accuracy and precision of the optimized method have been greatly improved and the experimental time is reduced about 40% by optimizing the operating steps. After the final optimization, the reduced workload is suitable for the accurate determination of a large number of samples. |
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