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Single Column Ion Chromatography: II. Analysis of Ammonium, Alkali Metals, and Alkaline Earth Cations in Soils
Author(s) -
Nieto K. Fitzpatrick,
Frankenberger W. T.
Publication year - 1985
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1985.03615995004900030012x
Subject(s) - chemistry , alkali metal , alkaline earth metal , ion chromatography , atomic absorption spectroscopy , nitric acid , ammonium , divalent , ion exchange , analytical chemistry (journal) , qualitative inorganic analysis , inorganic chemistry , ion , chromatography , physics , organic chemistry , quantum mechanics
Single column ion chromatography (SCIC) was evaluated as an effective analytical method for the determination of soluble ammonium, alkali metals, and alkaline earth cations in soil extracts. Eluents chosen for determination of the mono‐and divalent cations were 10 m M nitric acid (pH 2.1) and 5 m M ethylenediammonium dinitrate (pH 6.1), respectively. Separation was carried out on a commercially available, low‐capacity, cation exchange column, with conductimetric detection. SCIC can utilize very small sample sizes (≤ 500 µL), and yields linear, reproducible relationships between peak area and concentration of cations. Simultaneous determination of Li + , Na + , NH + 4 , and K + or Mg 2+ , Ca 2+ , Sr 2+ and Ba 2+ was performed in < 7 min with precision ranging from 3 to 8%. Determinations can be made against a background of various ions and organic constituents without interferences. Minimum detectable concentrations of the selected cations using a 500 µL loop were: Na 2+ , Ca 2+ , and Mg 2+ (0.05 mg/L), Li + and Ba 2+ (0.10 mg/L), NH + 4 ‐N (0.5 mg/L), and K + and Sr 2+ (1 mg/L). Results obtained by SCIC agreed closely with those obtained by other methods: NH + 4 ‐N, steam distillation ( r = 0.996***); Na + , atomic emission spectrometry (AES) ( r = 0.992***); K + , AES ( r = 0.999***); Mg 2+ , atomic absorption spectrometry (AAS) ( r = 0.995***); Ca 2+ , AAS ( r = 0.996***). Simplicity of this method makes it feasible to construct a HPLC instrument dedicated for the analysis of cations.