Name of indicators;А Grade;B Grade

1. Appearance;The colorless liquid is transparent in a layer of 15–20 mm when viewed against a white background;Colorless or slightly yellow liquid in a layer of 15-20 mm when viewed against a white background 2. Mass fraction of orthophosphoric acid NzPO4, %, not less than;73;73 3. Mass fraction of chlorides, %, not more than;0,005;0,01 4. Mass fraction of sulphates, %, not more than;0,01;0,015 5. Mass fraction of nitrates, %, not more than;0,0003;0,0005 6. Mass fraction of iron, %, not more than;0,002;0,01 7. Mass fraction of heavy metals of hydrogen sulfide group (Pb), %, not more than;0,0005;0,002 8. Mass fraction of arsenic, %, not more than;0,0003;0,006 9. Mass fraction of reducing substances in terms of H3PO3, %, not more than;0,1;0,2 10. Presence of metaphosphoric acid HPO3;Withstands the test;Withstands the test 11. Mass fraction of suspended particles, %, not more than;Withstands the test;Withstands the test 12. Presence of yellow phosphorus P4;Withstands the test;Not standardized 13. Fluorine mass dolp F, %, not more than;0,001;Not standardized 14. Mass fraction of cadmium Cd%, not more than;0,0001;Not standardized