ACS reagent (primary standard)
99.95-100.05% dry basis
≤1.0% loss on heating
12 (25 °C, 106 g/L)
851 °C (lit.)
chloride (Cl-): ≤0.001%
phosphate (PO43-): ≤0.001%
sulfur compounds (as SO42-): ≤0.003%
Fe: ≤5 ppm
heavy metals: ≤5 ppm (by ICP-OES)
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