YB/T 5331-2006 Chemical Analysis Method of Vanadium Pentoxide Co-precipitation-Extraction Molybdenum Blue Spectrophotometric Determination of Phosphorus (English Version)
2010YB/T 5331-2009 Determination of Phosphorous Vanadium Pentoxide Content Extraction Molybdenum Blue Spectrophotometry
2006YB/T 5331-2006 Chemical Analysis Method of Vanadium Pentoxide Co-precipitation-Extraction Molybdenum Blue Spectrophotometric Determination of Phosphorus