Selective Determination of Dihydrogen Phosphate Ions Derived from NaH2PO4 Using Cedar Sawdust

Key Points

• Selective determination of dihydrogen phosphate ions was successfully achieved using a colorimetric agent derived from cedar sawdust.
• Optimal conditions included 0.1 g of the agent, a reaction time of 90 minutes, and a pH range of 4 to 6, resulting in a linearity of r=0.995.
• Analysis showed that the batch method allows quantification within 2.5 to 25 mmol, while the column method quantifies between 0.5 to 4.0 mmol, both demonstrating high reliability.
• The developed colorimetric agent enables specific quantification of dihydrogen phosphate ions, suggesting valuable applications in environmental monitoring.