Analysis of Nitrous Acid and Ammonium Thiocyanate in Fertilizers

Fertilizers with high concentrations of nitrous acid and ammonium thiocyanate have a negative effect on plant growth, therefore maximum content levels (permitted content levels) for toxic substances are prescribed in official specifications for commercial fertilizers according to the Fertilizer Control Law. An example of simultaneous analysis of the nitrous acid and ammonium thiocyanate content of fertilizer by HPLC is described. Analysis was performed in conformance with the test method that appears in Testing Methods for Fertilizers (5.8.b and 5.9.a, 2016), published by the Food and Agricultural Materials Inspection Center (FAMIC).