YB/T 4726.4-2021 The determination of iron content in dust and sludge using ammonium iron sulfate reduction and silicon molybdenum spectrophotometry

YB/T 4726.3-2021 Iron-bearing dust and mud determination of titanium dioxide content Spectrophotometric method using di-aminotriphenylamine-methylene blue complex YB/T 4726.5-2021 Iron-bearing Dust and Sludge Determination of Phosphorus Content Bismuth-Phosphorus-Molybdenum Blue Spectrophotometry YB/T 4726.6-2021 Iron-bearing Dust and Slag: Determination of Sulfur Content by Infrared Absorption Method YB/T 4726.7-2021 YB/T 4726.7-2021 Iron-bearing Dust and Sludge Determination of Total Iron Content Tri-Chlorotitanate Reduction and Potassium Dichromate Titration Method YB/T 4726.8-2021 Iron-bearing dust and mud determination of carbon content by infrared absorption method YB/T 4726.9-2021 Ferric dust and mud determination of calcium oxide content by complex titration method YB/T 4726.10-2021 YB/T 4726.10-2021 Iron-bearing dust and mud determination of Al2O3 content by EDTA titration method YB/T 4726.11-2021 iron-bearing ash ferric oxide content determination potassium dichromate titration method YB/T 4726.12-2021 Iron-bearing dust and mud determination of manganese oxide content Spectrophotometric method using potassium (or sodium) periodate