Potassium sulfate

colorless crystal or powder AR grade: assay >=99% substances insoluable in water <=0.005% pH(50g/L,25 degree): 5.0∼8.0 chloride <=0.0005% clarity of solution: passes test heavy metals(as Pb) <=0.0005% total nitrogen(N) <=0.0005% As <=0.0001% Ca <=0.01% Fe <=0.0002% Na <=0.03% CP grade: assay >=98.5% substances insoluable in water <=0.01% pH(50g/L,25 degree): 5.0∼8.0 chloride <=0.001% clarity of solution: passes test heavy metals(as Pb) <=0.001% total nitrogen(N) <=0.001% As <=0.0005% Ca <=0.02% Fe <=0.0005% Na <=0.01% usage: making potassium salt; biochemical test of serum protein; catalyst