METHOD OF DETERMINATION OF COMPOSITION INDEX OF MIXED CARBAMIDE AND AMMONIUM NITRATE WATER SOLUTION Russian patent published in 1998 - IPC

FIELD: examination and analysis of materials. SUBSTANCE: method includes determination of the following indices of fertilizer composition: fraction of carbamide total mass, fraction of ammonium nitrate total mass, summary fraction of nitrogen total mass contained in carbamide and ammonium nitrate together, relation between content of carbamide and total content of carbamide and ammonium nitrate in fertilizer. Determination of composition indices in any case is performed by formula in which values of fertilizer density and conductivity at 25 C, as well as constant coefficients, the values of which are determined for every composition index, are substituted. Density and conductivity may be determined at any temperature within the range of 20-30 C, after which they are converted to values corresponding to temperature of 2 C. If fertilizer contains impurities significance of every impurity is estimated. If significant impurities are available, determination of composition index is reduced to determination of this index for pure solution which can by obtained from solution with impurities if the latter are replaced by quantities of water equivalent by mass. Density and conductivity of this pure solution is determined by calculation. EFFECT: more accurate determination of indices. 5 cl, 2 tbl