Determination of trace amounts of nitrate in potassium chloride-extracts by 
HPLC with ultra-violet-detection

Raessler, M.; Hilke, I.; Middelmann, S.

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Determination of trace amounts of nitrate in potassium chloride-extracts by HPLC with ultra-violet-detection

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Raessler, M.
Service Facility Spectrometry, Dr. M. Raessler, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Hilke, I.
Service Facility Spectrometry, Dr. M. Raessler, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Middelmann, S.
Service Facility Spectrometry, Dr. M. Raessler, Max Planck Institute for Biogeochemistry, Max Planck Society;

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Citation

Raessler, M., Hilke, I., & Middelmann, S. (2004). Determination of trace amounts of nitrate in potassium chloride-extracts by HPLC with ultra-violet-detection. Communications in Soil Science and Plant Analysis, 35(1-2), 69-83.

Cite as: https://hdl.handle.net/11858/00-001M-0000-000E-D219-3

Abstract

A method is presented that allows the determination of trace amounts of nitrate in I M potassium chloride extracts of environmental soil samples from Northern Europe. To avoid the interference of bromine ions on the evaluation of the nitrate peak, 50 muL of a 50mg/L nitrate standard solution are added to a 5mL soil extract. This makes sure that the overall nitrate concentration in the spike is >500 mug/L which allows an exact and reliable determination of the nitrate concentration. Analyses of the soil extracts are carried out by anion-exchange HPLC with ultra-violet detection at lambda = 210nm using 0.1 M KCl as eluent. Concentrations down to 25 mug/L of nitrate can be analyzed.