Analytical Sciences

Abstract − Analytical Sciences, 27(8), 861 (2011).

Preliminary Study of Quantitative Analysis of Ammonium Ions in a Raindrop Following Liesegang Ring Formation
Naomi TOMIKAWA, Ben NANZAI, and Manabu IGAWA
Department of Material and Life Chemistry, Faculty of Engineering, Kanagawa University, 3-27-1 Rokkakubashi, Kanagawa, Yokohama 221-8686, Japan
NH4+ concentration in an individual droplet was determined by forming a Liesegang ring on a gelatin film containing NaB(C6H5)4. The NH4+ concentration (mol L−1 abbreviated to M) was calculated from the NH4+ amount (mol) ascertained in a droplet using pixel count measurements. The droplet volume (L) was calculated by measurement of the diameter of a droplet print on the gelatin film. For rainwater, the NH4+ concentration estimated using this method corresponded with results obtained using ion chromatography.