Stabilization of an Aqueous Solution of a Liquid Micro Fertilizer Containing Trilon B as a Chelating Agent. Structure of the Molecular Crystal of Sodium Carbamide Ethylenediaminetetraacetate Hydrate NaH3L1·(H2N)2CO·H2O

Chemical analysis methods were used to identify the causes for precipitation and fouling with a gray-green deposit of a vessel for the storage of liquid micro fertilizer consisting of ammonium heptamolybdate, potassium chloride, ammonium vanadate, boric acid, chromium trichloride, sodium selenate, and Trilon B as a chelating ligand. The precipitate represented the crystalline 1 : 1 complex of Trilon B with carbamide NaH3L1·(H2N)2CO·H2O (H4L1 = ethylenediaminetetraacetic acid). The deposit on the vessel bottom and wall was formed upon transformation of the molybdenum complex Na4(MoO3)2L1·8H2O into insoluble coordination polymer in an acid medium. Neutralization of the solution to pH 6–7 and a decrease in the concentration of Trilon B gave a violet micro fertilizer solution that was stable during storage. The molecular structure of the NaH3L1·(H2N)2CO·H2O crystal was determined.