ParameterGradeStandard: Q/12HG5461-2001 AgricultureIndustrial IIIIndustrial IIINH4Cl Content (dry basis) % ≥ 98.59999.399.5Moisture% ≤ 0.50.70.40.23Residue after Ignition % ≤ --0.40.40.4Iron Content (as Fe) % ≤ --0.0010.0010.001Heavy Metal (as Pb) % ≤ --0.00050.00050.0005Sulphate Content (as SO4) % ≤ --0.040.040.04PH Value (200g/L solution, temperature 25) 5.14.0-5.85.05.0