Ion chromatographic determination of nitrate in 2 M KC1 soil extracts |
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| Authors: | B M STEWART |
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| Institution: | Department of Agriculture, Freshwater Biological Investigation Unit, Greenmount Road, Muckamore, Antrim BT41 4PX, N. Ireland |
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| Abstract: | A method for the analysis of NO3-N in a 2 m KCL soil extract, using ion chromatography, is discussed. It involves the treatment of the KCl extract with Ag+-activated cation exchange resin to remove excess Cl–, followed by analysis using a Dionex ion chromatograph. The results of NO3-N in soil extracts agreed closely with those obtained by steam distillation. The method was linear up to 20 mg N dm–3 with a detection limit of 0.1 mg Ndm–3. Quantitative recovery of NO3-N added to soil extracts over the linear range were observed.
Standard deviations of samples containing 2.57 and 15.11 mgN dm–3 were found to be 0.06 and 0.11 respectively. |
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