Simultaneous ion-exclusion/cation-exchange chromatography of anions and cations in acid rain waters on a weakly acidic cation-exchange resin by elution with sulfosalicylic acid
K. Tanaka et al., Simultaneous ion-exclusion/cation-exchange chromatography of anions and cations in acid rain waters on a weakly acidic cation-exchange resin by elution with sulfosalicylic acid, J CHROMAT A, 884(1-2), 2000, pp. 167-174
A simple, selective, and sensitive method for the simultaneous determinatio
n of anions (sulfate, nitrate, and chloride) and cations (sodium, ammonium,
potassium, magnesium, and calcium) in acid rain waters was developed using
ion-exclusion/cation-exchange chromatography with conductimetric detection
. A weakly acidic cation-exchange resin column (Tosho TSKgel OA-PAK-A) and
a sulfosalicylic acid-methanol-water eluent was used. With a mobile phase c
omprising 1.25 mM sulfosalicylic acid in methanol-water (7.5:92.5) at 1.2 m
l/min, simultaneous separation and detection of the above anions and cation
s was achieved in about 30 min, Linear calibration plots of peak area versu
s concentration were obtained over the concentration ranges 0-1.0 mM for an
ions (R = 0.9991) and 0-0.5 mM for cations (R = 0.9994). Detection limits c
alculated at S/N = 3 ranged from 4.1 to 14.8 ppb for the anions and from 2.
4 to 12.1 ppb for the cations. The reproducibility of retention times was 0
.14-0.15% relative standard deviation (RSD) for anions and 0.18-0.31% for c
ations, and reproducibility of chromatographic peak areas was 1.22-1.75% RS
D for anions and 1.81-2.10% for cations, The method was applied successfull
y to the simultaneous determination of anions and cations in aerosols trans
ported from mainland China to central Japan, as determined by a meteorologi
cal satellite data analyzer. (C) 2000 Elsevier Science B.V. All rights rese
rved.