Microchemical Detection of Nitrite ion Using Ion-Exchange Resin Particles

Abstract

“Resin Spot Te st” method was applied to the 'detection of a minute amount of nitrite ion. A drop of sample solution on a white spot plate was mixed with a few particles of the cation exchange resin (Dowex 50 W-X 2 [H]) and a drop of 1% Griess-Romijn reagent was added. Red purple color appeared on the resin particles. The limit of identification was 0.003 μg, and the dilution limit was 1: 10⁷. Several metallic ions, such as Cu (II), Fe (II), Fe (III) ions and S^2- interfered with this test.