Abstract
Ion chromatographic determination of ammonium ion using a non-suppressor-type ion chromatographic apparatus was applied to the rain and snow samples. Analytical conditions, including the concentration of eluent and the pH of the sample solutions, were examined to achieve the maximum sensitivity. The recovery of the amount added to the actual rain sample was found to be 95-105%. Comparison with the spectrophoto-metric determination using indophenol was also done with sufficient reliability for a field method. Each event rain sample at Tsukuba Science City, Japan, during 1984 was used for this determination. The seasonal variation of the concentration of ammonium ion was obtained. Vertical differences of the concentration of ammonium ion in the deposition sample of 1985 were also studied using the Meteorological Observation Tower (213 m).
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