NSF Std. 60 Listed Orthophosphate Chemicals

Approximate % active as PO4
Approximate pH value (1% solution)

Name: Phosphoric Acid
Formula: H3PO4
% active: 75% (pH 1)

Name: Monosodium orthophosphate
Formula: NaH2PO4
% active: 79% (pH 4.5)

Name: Monopotassium orthophosphate
Formula: KH2PO4
% active: 70% (pH 4.5)

Name: Disodium orthophosphate
Formula: Na2HPO4
% active: 67% (pH 9.1)

Name: Dipotassium orthophosphate
Formula: K2HPO4
% active: 55% (pH 9.2)

Name: Trisodium orthophosphate
Formula: Na3PO4
% active: 56% (pH 12)

Name: Tripotassium orthophosphate
Formula: K3PO4
% active: 43% (pH 12)

Name: Zinc orthophosphate
Formula: Zn3(PO4)2
% active: 5%-70% (pH 1)
2 mg/L maximum residual of zinc

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