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A Modified Procedure for the Determination of Phosphorus in Detergents

Section 3: Reagents

3.1 Sodium Hydroxide
approximately 0.25N (not standardized) - prepared from carbonate free 1 + 1 sodium hydroxide by dilution.

3.2 Sodium Hydroxide Solution (1 + 1)
Dissolve sodium hydroxide (NaOH) in an equal weight of water. When using, decant the solution from the settled carbonate. A more dilute solution may be used. NaOH solutions must be protected from carbon dioxide (CO2) contamination.

3.3 Potassium dihydrogen phosphate
reagent grade oven-dried at 105°C.

3.4 Hydrochloric Acid
reagent grade, specific gravity 1.19.

3.5 Methanol
at least 90% CH3OH.
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