ION SELECTIVE MATERIAL FOR DETECTING AMMONIUM IONS AND METHOD FOR PREPARING IT Russian patent published in 2015 - IPC C01G31/00 C01C1/28 G01N27/333 H01M4/48 

FIELD: chemistry.

SUBSTANCE: hydrated ammonium vanadium oxide bronze of formula (NH₄)_0.5V₂O₅·0,5H₂O is used as an ion-selective material for the selective detection of the ammonium ion concentration in solutions. Preparing hydrated ammonium vanadium oxide bronze of the above formulation is ensured by ammonium metavanadate NH₄VO₃ and anaqueous solution of citric acid is added drop by drop with constant stirring to set solution acidity within the range of 2.0≤pH≤6.0. The mixture is processed at temperature 140-180°C for 24-48 hours in a pressure steriliser. The prepared product is filtered, washed and dried.

EFFECT: invention enables preparing the ion-selective material for simple and reliable detection of the NH₄ ⁺ concentration in the solutions.

2 cl, 5 dwg, 1 tbl, 4 ex