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CAS#: 7778-77-0 | Formula: KH2PO4 | Specifications: Absorbance (1M in H2O) @ 260 nm 0.046 Max, Absorbance (1M in H2O) @ 280 nm 0.040 Max, Al 5 ppm Max, As 0.1 ppm Max, Assay 99.5 % - Min, Ba 5 ppm Max, Bi 5 ppm Max, Ca 10 ppm Max, Cd 5 ppm Max, Chloride (Cl) 0.0005 % Max, Co 5 ppm Max, Cr 5 ppm Max, Cu 5 ppm Max, Fe 10 ppm Max, Insoluble matter 0.01 % Max, Li 5 ppm Max, Mg 5 ppm Max, Mn 5 ppm Max, Mo 5 ppm Max, Na 50 ppm Max, Ni 5 ppm Max, Pb 5 ppm Max, pH (1 M in water @ 20 C) (pH) 4.1 - 4.5 pH, Sr 5 ppm Max, Sulfate (SO4) 0.001 % Max, Total Nitrogen (N) 0.001 % Max, Zn 5 ppm Max