Сульфат аммония удобрения

Our agriculture grade ammonium sulphate can also be used in some industrial areas. Technical specifications of Ammonium Sulphate (National Standard GB535-1995) ItemSupreme gradeFirst gradeQualified gradeAppearance White crystal,no visible mechanical impurityno visible mechanical impurityno visible mechanical impurityN content(dry basis),% ≥21.021.020.5Water content(H2O),% ≤0.20.31.0Free acid(H2SO4)content,% ≤0.030.050.20Fe content, % ≤0.007--As content,% ≤0.00005--Heavy metal(Pb)content,% ≤0.005--Water insolubles,% ≤0.01--Note: When ammonium sulphate is used in agriculture,it is not necessary to check the content of Fe,As,heavy metal and water insolubles.