Phosphate standard solution preparation
Phosphate Standard Solution (200 ppm PO4):Dissolve potassium dihydrogen phosphate equivalent to 0.286 g of KH2PO4 in water and dilute to 1000.0 mL with the same solvent.
Phosphate Standard Solution (100 ppm PO4):
Dilute 10.0 mL of a 0.143% w/v solution of potassium dihydrogen orthophosphate to 100.0 mL with water immediately before use.
Phosphate Standard Solution (5 ppm PO4):
Immediately before use, dilute with water to 100 times its volume a solution containing potassium dihydrogen phosphate equivalent to 0.716 g of KH2PO4 in 1000.0 mL.
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