Ion-chromatographic determination of small concentrations of nitrate in solutions of high salinity. Michael Raessler and Ines Hilke Max-Planck-Institut fuer Biogeochemie, Hans-Knoell-Strasse 10, D-07745 Jena, Germany. Common methods for the determination of small amounts of nitrate.
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Ion-chromatographic determination of small concentrations of nitrate in solutions of high salinity
Michael Raessler and Ines Hilke
Max-Planck-Institut fuer Biogeochemie, Hans-Knoell-Strasse 10, D-07745 Jena, Germany
Disadvantage: not appropriate to solutions of high sanility
Pump module:Dionex GP 40
Detection:Dionex AD 20 (UV/VIS detector)
Sample loop:100 µl
Column: Hamilton PRP X-100, 250 x 4,1 mm
Eluent: 0,1 M KCl based on KCl 99,999% „suprapur“ (Merck)
Wavelength:λ = 210 nm
Application:Determination of NO3- in soil extracts of 1 M KCl
Problem:KCl of „p.A.“ grade may contain up to 0,005 % Br-
Solution of 1 M CKl contains up to 1725 µg/L Br-
Br- interferes with NO3- determination at trace level
50µL of spike containing 50mg/L NO3- are added to 5 mL of extract
Correction factor necessary: Volume of extract is changed by 1%!
Concentration after additionofspike [µg/L]: 631,1
Mean (N=10) [µg/L]:629,4±7,8
Recovery [%] :99,7%